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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/bits/stl_algo.h')
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1 files changed, 6139 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/bits/stl_algo.h b/gcc-4.4.3/libstdc++-v3/include/bits/stl_algo.h new file mode 100644 index 000000000..f54b1cd77 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/bits/stl_algo.h @@ -0,0 +1,6139 @@ +// Algorithm implementation -*- C++ -*- + +// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 +// Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/* + * + * Copyright (c) 1994 + * Hewlett-Packard Company + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Hewlett-Packard Company makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + * + * Copyright (c) 1996 + * Silicon Graphics Computer Systems, Inc. + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Silicon Graphics makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + */ + +/** @file stl_algo.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +#ifndef _STL_ALGO_H +#define _STL_ALGO_H 1 + +#include <cstdlib> // for rand +#include <bits/algorithmfwd.h> +#include <bits/stl_heap.h> +#include <bits/stl_tempbuf.h> // for _Temporary_buffer +#include <debug/debug.h> +#include <initializer_list> + +// See concept_check.h for the __glibcxx_*_requires macros. + +_GLIBCXX_BEGIN_NAMESPACE(std) + +// Local modification: if __google_stl_debug_compare is defined to +// non-zero value, check sort predicate for strict weak ordering. +// See http://b/1731200. +#if __google_stl_debug_compare + template<typename _Compare> + struct _CheckedCompare { + // Mutable because some clients use non-const operator(). + mutable _Compare _M_compare; + + _CheckedCompare(const _Compare & __comp): _M_compare(__comp) { } + + template <typename _Tp> + bool operator()(const _Tp& __x, const _Tp& __y) const { + if (_M_compare(__x, __x)) + __throw_runtime_error("strict weak ordering: (__x LT __x) != false"); + if (_M_compare(__y, __y)) + __throw_runtime_error("strict weak ordering: (__y LT __y) != false"); + bool lt = _M_compare(__x, __y); + if (lt && _M_compare(__y, __x)) + __throw_runtime_error("strict weak ordering: ((__x LT __y) && (__y LT __x)) != false"); + return lt; + } + + // Different types; can't perform any checks. + // When building //indexterm/internal:indexterm, + // indexterm/internal/numericterms.cc + // fails without this. + template <typename _Tp1, typename _Tp2> + bool operator()(const _Tp1& __x, const _Tp2& __y) const { + return _M_compare(__x, __y); + } + }; +# define __CheckedCompare(__comp) _CheckedCompare<__typeof__(__comp)>(__comp) +#else +# define __CheckedCompare(__comp) __comp +#endif + + /** + * @brief Find the median of three values. + * @param a A value. + * @param b A value. + * @param c A value. + * @return One of @p a, @p b or @p c. + * + * If @c {l,m,n} is some convolution of @p {a,b,c} such that @c l<=m<=n + * then the value returned will be @c m. + * This is an SGI extension. + * @ingroup SGIextensions + */ + template<typename _Tp> + inline const _Tp& + __median(const _Tp& __a, const _Tp& __b, const _Tp& __c) + { + // concept requirements + __glibcxx_function_requires(_LessThanComparableConcept<_Tp>) + if (__a < __b) + if (__b < __c) + return __b; + else if (__a < __c) + return __c; + else + return __a; + else if (__a < __c) + return __a; + else if (__b < __c) + return __c; + else + return __b; + } + + /** + * @brief Find the median of three values using a predicate for comparison. + * @param a A value. + * @param b A value. + * @param c A value. + * @param comp A binary predicate. + * @return One of @p a, @p b or @p c. + * + * If @c {l,m,n} is some convolution of @p {a,b,c} such that @p comp(l,m) + * and @p comp(m,n) are both true then the value returned will be @c m. + * This is an SGI extension. + * @ingroup SGIextensions + */ + template<typename _Tp, typename _Compare> + inline const _Tp& + __median(const _Tp& __a, const _Tp& __b, const _Tp& __c, _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_BinaryFunctionConcept<_Compare, bool, + _Tp, _Tp>) + if (__comp(__a, __b)) + if (__comp(__b, __c)) + return __b; + else if (__comp(__a, __c)) + return __c; + else + return __a; + else if (__comp(__a, __c)) + return __a; + else if (__comp(__b, __c)) + return __c; + else + return __b; + } + + // for_each + + /// This is an overload used by find() for the Input Iterator case. + template<typename _InputIterator, typename _Tp> + inline _InputIterator + __find(_InputIterator __first, _InputIterator __last, + const _Tp& __val, input_iterator_tag) + { + while (__first != __last && !(*__first == __val)) + ++__first; + return __first; + } + + /// This is an overload used by find_if() for the Input Iterator case. + template<typename _InputIterator, typename _Predicate> + inline _InputIterator + __find_if(_InputIterator __first, _InputIterator __last, + _Predicate __pred, input_iterator_tag) + { + while (__first != __last && !bool(__pred(*__first))) + ++__first; + return __first; + } + + /// This is an overload used by find() for the RAI case. + template<typename _RandomAccessIterator, typename _Tp> + _RandomAccessIterator + __find(_RandomAccessIterator __first, _RandomAccessIterator __last, + const _Tp& __val, random_access_iterator_tag) + { + typename iterator_traits<_RandomAccessIterator>::difference_type + __trip_count = (__last - __first) >> 2; + + for (; __trip_count > 0; --__trip_count) + { + if (*__first == __val) + return __first; + ++__first; + + if (*__first == __val) + return __first; + ++__first; + + if (*__first == __val) + return __first; + ++__first; + + if (*__first == __val) + return __first; + ++__first; + } + + switch (__last - __first) + { + case 3: + if (*__first == __val) + return __first; + ++__first; + case 2: + if (*__first == __val) + return __first; + ++__first; + case 1: + if (*__first == __val) + return __first; + ++__first; + case 0: + default: + return __last; + } + } + + /// This is an overload used by find_if() for the RAI case. + template<typename _RandomAccessIterator, typename _Predicate> + _RandomAccessIterator + __find_if(_RandomAccessIterator __first, _RandomAccessIterator __last, + _Predicate __pred, random_access_iterator_tag) + { + typename iterator_traits<_RandomAccessIterator>::difference_type + __trip_count = (__last - __first) >> 2; + + for (; __trip_count > 0; --__trip_count) + { + if (__pred(*__first)) + return __first; + ++__first; + + if (__pred(*__first)) + return __first; + ++__first; + + if (__pred(*__first)) + return __first; + ++__first; + + if (__pred(*__first)) + return __first; + ++__first; + } + + switch (__last - __first) + { + case 3: + if (__pred(*__first)) + return __first; + ++__first; + case 2: + if (__pred(*__first)) + return __first; + ++__first; + case 1: + if (__pred(*__first)) + return __first; + ++__first; + case 0: + default: + return __last; + } + } + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /// This is an overload used by find_if_not() for the Input Iterator case. + template<typename _InputIterator, typename _Predicate> + inline _InputIterator + __find_if_not(_InputIterator __first, _InputIterator __last, + _Predicate __pred, input_iterator_tag) + { + while (__first != __last && bool(__pred(*__first))) + ++__first; + return __first; + } + + /// This is an overload used by find_if_not() for the RAI case. + template<typename _RandomAccessIterator, typename _Predicate> + _RandomAccessIterator + __find_if_not(_RandomAccessIterator __first, _RandomAccessIterator __last, + _Predicate __pred, random_access_iterator_tag) + { + typename iterator_traits<_RandomAccessIterator>::difference_type + __trip_count = (__last - __first) >> 2; + + for (; __trip_count > 0; --__trip_count) + { + if (!bool(__pred(*__first))) + return __first; + ++__first; + + if (!bool(__pred(*__first))) + return __first; + ++__first; + + if (!bool(__pred(*__first))) + return __first; + ++__first; + + if (!bool(__pred(*__first))) + return __first; + ++__first; + } + + switch (__last - __first) + { + case 3: + if (!bool(__pred(*__first))) + return __first; + ++__first; + case 2: + if (!bool(__pred(*__first))) + return __first; + ++__first; + case 1: + if (!bool(__pred(*__first))) + return __first; + ++__first; + case 0: + default: + return __last; + } + } +#endif + + // set_difference + // set_intersection + // set_symmetric_difference + // set_union + // for_each + // find + // find_if + // find_first_of + // adjacent_find + // count + // count_if + // search + + /** + * This is an uglified + * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&) + * overloaded for forward iterators. + */ + template<typename _ForwardIterator, typename _Integer, typename _Tp> + _ForwardIterator + __search_n(_ForwardIterator __first, _ForwardIterator __last, + _Integer __count, const _Tp& __val, + std::forward_iterator_tag) + { + __first = _GLIBCXX_STD_P::find(__first, __last, __val); + while (__first != __last) + { + typename iterator_traits<_ForwardIterator>::difference_type + __n = __count; + _ForwardIterator __i = __first; + ++__i; + while (__i != __last && __n != 1 && *__i == __val) + { + ++__i; + --__n; + } + if (__n == 1) + return __first; + if (__i == __last) + return __last; + __first = _GLIBCXX_STD_P::find(++__i, __last, __val); + } + return __last; + } + + /** + * This is an uglified + * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&) + * overloaded for random access iterators. + */ + template<typename _RandomAccessIter, typename _Integer, typename _Tp> + _RandomAccessIter + __search_n(_RandomAccessIter __first, _RandomAccessIter __last, + _Integer __count, const _Tp& __val, + std::random_access_iterator_tag) + { + + typedef typename std::iterator_traits<_RandomAccessIter>::difference_type + _DistanceType; + + _DistanceType __tailSize = __last - __first; + const _DistanceType __pattSize = __count; + + if (__tailSize < __pattSize) + return __last; + + const _DistanceType __skipOffset = __pattSize - 1; + _RandomAccessIter __lookAhead = __first + __skipOffset; + __tailSize -= __pattSize; + + while (1) // the main loop... + { + // __lookAhead here is always pointing to the last element of next + // possible match. + while (!(*__lookAhead == __val)) // the skip loop... + { + if (__tailSize < __pattSize) + return __last; // Failure + __lookAhead += __pattSize; + __tailSize -= __pattSize; + } + _DistanceType __remainder = __skipOffset; + for (_RandomAccessIter __backTrack = __lookAhead - 1; + *__backTrack == __val; --__backTrack) + { + if (--__remainder == 0) + return (__lookAhead - __skipOffset); // Success + } + if (__remainder > __tailSize) + return __last; // Failure + __lookAhead += __remainder; + __tailSize -= __remainder; + } + } + + // search_n + + /** + * This is an uglified + * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&, + * _BinaryPredicate) + * overloaded for forward iterators. + */ + template<typename _ForwardIterator, typename _Integer, typename _Tp, + typename _BinaryPredicate> + _ForwardIterator + __search_n(_ForwardIterator __first, _ForwardIterator __last, + _Integer __count, const _Tp& __val, + _BinaryPredicate __binary_pred, std::forward_iterator_tag) + { + while (__first != __last && !bool(__binary_pred(*__first, __val))) + ++__first; + + while (__first != __last) + { + typename iterator_traits<_ForwardIterator>::difference_type + __n = __count; + _ForwardIterator __i = __first; + ++__i; + while (__i != __last && __n != 1 && bool(__binary_pred(*__i, __val))) + { + ++__i; + --__n; + } + if (__n == 1) + return __first; + if (__i == __last) + return __last; + __first = ++__i; + while (__first != __last + && !bool(__binary_pred(*__first, __val))) + ++__first; + } + return __last; + } + + /** + * This is an uglified + * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&, + * _BinaryPredicate) + * overloaded for random access iterators. + */ + template<typename _RandomAccessIter, typename _Integer, typename _Tp, + typename _BinaryPredicate> + _RandomAccessIter + __search_n(_RandomAccessIter __first, _RandomAccessIter __last, + _Integer __count, const _Tp& __val, + _BinaryPredicate __binary_pred, std::random_access_iterator_tag) + { + + typedef typename std::iterator_traits<_RandomAccessIter>::difference_type + _DistanceType; + + _DistanceType __tailSize = __last - __first; + const _DistanceType __pattSize = __count; + + if (__tailSize < __pattSize) + return __last; + + const _DistanceType __skipOffset = __pattSize - 1; + _RandomAccessIter __lookAhead = __first + __skipOffset; + __tailSize -= __pattSize; + + while (1) // the main loop... + { + // __lookAhead here is always pointing to the last element of next + // possible match. + while (!bool(__binary_pred(*__lookAhead, __val))) // the skip loop... + { + if (__tailSize < __pattSize) + return __last; // Failure + __lookAhead += __pattSize; + __tailSize -= __pattSize; + } + _DistanceType __remainder = __skipOffset; + for (_RandomAccessIter __backTrack = __lookAhead - 1; + __binary_pred(*__backTrack, __val); --__backTrack) + { + if (--__remainder == 0) + return (__lookAhead - __skipOffset); // Success + } + if (__remainder > __tailSize) + return __last; // Failure + __lookAhead += __remainder; + __tailSize -= __remainder; + } + } + + // find_end for forward iterators. + template<typename _ForwardIterator1, typename _ForwardIterator2> + _ForwardIterator1 + __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, + _ForwardIterator2 __first2, _ForwardIterator2 __last2, + forward_iterator_tag, forward_iterator_tag) + { + if (__first2 == __last2) + return __last1; + else + { + _ForwardIterator1 __result = __last1; + while (1) + { + _ForwardIterator1 __new_result + = _GLIBCXX_STD_P::search(__first1, __last1, __first2, __last2); + if (__new_result == __last1) + return __result; + else + { + __result = __new_result; + __first1 = __new_result; + ++__first1; + } + } + } + } + + template<typename _ForwardIterator1, typename _ForwardIterator2, + typename _BinaryPredicate> + _ForwardIterator1 + __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, + _ForwardIterator2 __first2, _ForwardIterator2 __last2, + forward_iterator_tag, forward_iterator_tag, + _BinaryPredicate __comp) + { + if (__first2 == __last2) + return __last1; + else + { + _ForwardIterator1 __result = __last1; + while (1) + { + _ForwardIterator1 __new_result + = _GLIBCXX_STD_P::search(__first1, __last1, __first2, + __last2, __comp); + if (__new_result == __last1) + return __result; + else + { + __result = __new_result; + __first1 = __new_result; + ++__first1; + } + } + } + } + + // find_end for bidirectional iterators (much faster). + template<typename _BidirectionalIterator1, typename _BidirectionalIterator2> + _BidirectionalIterator1 + __find_end(_BidirectionalIterator1 __first1, + _BidirectionalIterator1 __last1, + _BidirectionalIterator2 __first2, + _BidirectionalIterator2 __last2, + bidirectional_iterator_tag, bidirectional_iterator_tag) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator1>) + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator2>) + + typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1; + typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2; + + _RevIterator1 __rlast1(__first1); + _RevIterator2 __rlast2(__first2); + _RevIterator1 __rresult = _GLIBCXX_STD_P::search(_RevIterator1(__last1), + __rlast1, + _RevIterator2(__last2), + __rlast2); + + if (__rresult == __rlast1) + return __last1; + else + { + _BidirectionalIterator1 __result = __rresult.base(); + std::advance(__result, -std::distance(__first2, __last2)); + return __result; + } + } + + template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, + typename _BinaryPredicate> + _BidirectionalIterator1 + __find_end(_BidirectionalIterator1 __first1, + _BidirectionalIterator1 __last1, + _BidirectionalIterator2 __first2, + _BidirectionalIterator2 __last2, + bidirectional_iterator_tag, bidirectional_iterator_tag, + _BinaryPredicate __comp) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator1>) + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator2>) + + typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1; + typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2; + + _RevIterator1 __rlast1(__first1); + _RevIterator2 __rlast2(__first2); + _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1, + _RevIterator2(__last2), __rlast2, + __comp); + + if (__rresult == __rlast1) + return __last1; + else + { + _BidirectionalIterator1 __result = __rresult.base(); + std::advance(__result, -std::distance(__first2, __last2)); + return __result; + } + } + + /** + * @brief Find last matching subsequence in a sequence. + * @ingroup non_mutating_algorithms + * @param first1 Start of range to search. + * @param last1 End of range to search. + * @param first2 Start of sequence to match. + * @param last2 End of sequence to match. + * @return The last iterator @c i in the range + * @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N) + * for each @c N in the range @p [0,last2-first2), or @p last1 if no + * such iterator exists. + * + * Searches the range @p [first1,last1) for a sub-sequence that compares + * equal value-by-value with the sequence given by @p [first2,last2) and + * returns an iterator to the first element of the sub-sequence, or + * @p last1 if the sub-sequence is not found. The sub-sequence will be the + * last such subsequence contained in [first,last1). + * + * Because the sub-sequence must lie completely within the range + * @p [first1,last1) it must start at a position less than + * @p last1-(last2-first2) where @p last2-first2 is the length of the + * sub-sequence. + * This means that the returned iterator @c i will be in the range + * @p [first1,last1-(last2-first2)) + */ + template<typename _ForwardIterator1, typename _ForwardIterator2> + inline _ForwardIterator1 + find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, + _ForwardIterator2 __first2, _ForwardIterator2 __last2) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_ForwardIterator1>::value_type, + typename iterator_traits<_ForwardIterator2>::value_type>) + __glibcxx_requires_valid_range(__first1, __last1); + __glibcxx_requires_valid_range(__first2, __last2); + + return std::__find_end(__first1, __last1, __first2, __last2, + std::__iterator_category(__first1), + std::__iterator_category(__first2)); + } + + /** + * @brief Find last matching subsequence in a sequence using a predicate. + * @ingroup non_mutating_algorithms + * @param first1 Start of range to search. + * @param last1 End of range to search. + * @param first2 Start of sequence to match. + * @param last2 End of sequence to match. + * @param comp The predicate to use. + * @return The last iterator @c i in the range + * @p [first1,last1-(last2-first2)) such that @c predicate(*(i+N), @p + * (first2+N)) is true for each @c N in the range @p [0,last2-first2), or + * @p last1 if no such iterator exists. + * + * Searches the range @p [first1,last1) for a sub-sequence that compares + * equal value-by-value with the sequence given by @p [first2,last2) using + * comp as a predicate and returns an iterator to the first element of the + * sub-sequence, or @p last1 if the sub-sequence is not found. The + * sub-sequence will be the last such subsequence contained in + * [first,last1). + * + * Because the sub-sequence must lie completely within the range + * @p [first1,last1) it must start at a position less than + * @p last1-(last2-first2) where @p last2-first2 is the length of the + * sub-sequence. + * This means that the returned iterator @c i will be in the range + * @p [first1,last1-(last2-first2)) + */ + template<typename _ForwardIterator1, typename _ForwardIterator2, + typename _BinaryPredicate> + inline _ForwardIterator1 + find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, + _ForwardIterator2 __first2, _ForwardIterator2 __last2, + _BinaryPredicate __comp) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator1>::value_type, + typename iterator_traits<_ForwardIterator2>::value_type>) + __glibcxx_requires_valid_range(__first1, __last1); + __glibcxx_requires_valid_range(__first2, __last2); + + return std::__find_end(__first1, __last1, __first2, __last2, + std::__iterator_category(__first1), + std::__iterator_category(__first2), + __comp); + } + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /** + * @brief Checks that a predicate is true for all the elements + * of a sequence. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return True if the check is true, false otherwise. + * + * Returns true if @p pred is true for each element in the range + * @p [first,last), and false otherwise. + */ + template<typename _InputIterator, typename _Predicate> + inline bool + all_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) + { return __last == std::find_if_not(__first, __last, __pred); } + + /** + * @brief Checks that a predicate is false for all the elements + * of a sequence. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return True if the check is true, false otherwise. + * + * Returns true if @p pred is false for each element in the range + * @p [first,last), and false otherwise. + */ + template<typename _InputIterator, typename _Predicate> + inline bool + none_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) + { return __last == _GLIBCXX_STD_P::find_if(__first, __last, __pred); } + + /** + * @brief Checks that a predicate is false for at least an element + * of a sequence. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return True if the check is true, false otherwise. + * + * Returns true if an element exists in the range @p [first,last) such that + * @p pred is true, and false otherwise. + */ + template<typename _InputIterator, typename _Predicate> + inline bool + any_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) + { return !std::none_of(__first, __last, __pred); } + + /** + * @brief Find the first element in a sequence for which a + * predicate is false. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return The first iterator @c i in the range @p [first,last) + * such that @p pred(*i) is false, or @p last if no such iterator exists. + */ + template<typename _InputIterator, typename _Predicate> + inline _InputIterator + find_if_not(_InputIterator __first, _InputIterator __last, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + return std::__find_if_not(__first, __last, __pred, + std::__iterator_category(__first)); + } + + /** + * @brief Checks whether the sequence is partitioned. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return True if the range @p [first,last) is partioned by @p pred, + * i.e. if all elements that satisfy @p pred appear before those that + * do not. + */ + template<typename _InputIterator, typename _Predicate> + inline bool + is_partitioned(_InputIterator __first, _InputIterator __last, + _Predicate __pred) + { + __first = std::find_if_not(__first, __last, __pred); + return std::none_of(__first, __last, __pred); + } + + /** + * @brief Find the partition point of a partitioned range. + * @ingroup mutating_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param pred A predicate. + * @return An iterator @p mid such that @p all_of(first, mid, pred) + * and @p none_of(mid, last, pred) are both true. + */ + template<typename _ForwardIterator, typename _Predicate> + _ForwardIterator + partition_point(_ForwardIterator __first, _ForwardIterator __last, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_ForwardIterator>::value_type>) + + // A specific debug-mode test will be necessary... + __glibcxx_requires_valid_range(__first, __last); + + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (__pred(*__middle)) + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + else + __len = __half; + } + return __first; + } +#endif + + + /** + * @brief Copy a sequence, removing elements of a given value. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param value The value to be removed. + * @return An iterator designating the end of the resulting sequence. + * + * Copies each element in the range @p [first,last) not equal to @p value + * to the range beginning at @p result. + * remove_copy() is stable, so the relative order of elements that are + * copied is unchanged. + */ + template<typename _InputIterator, typename _OutputIterator, typename _Tp> + _OutputIterator + remove_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, const _Tp& __value) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_InputIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + if (!(*__first == __value)) + { + *__result = *__first; + ++__result; + } + return __result; + } + + /** + * @brief Copy a sequence, removing elements for which a predicate is true. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param pred A predicate. + * @return An iterator designating the end of the resulting sequence. + * + * Copies each element in the range @p [first,last) for which + * @p pred returns false to the range beginning at @p result. + * + * remove_copy_if() is stable, so the relative order of elements that are + * copied is unchanged. + */ + template<typename _InputIterator, typename _OutputIterator, + typename _Predicate> + _OutputIterator + remove_copy_if(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + if (!bool(__pred(*__first))) + { + *__result = *__first; + ++__result; + } + return __result; + } + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /** + * @brief Copy the elements of a sequence for which a predicate is true. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param pred A predicate. + * @return An iterator designating the end of the resulting sequence. + * + * Copies each element in the range @p [first,last) for which + * @p pred returns true to the range beginning at @p result. + * + * copy_if() is stable, so the relative order of elements that are + * copied is unchanged. + */ + template<typename _InputIterator, typename _OutputIterator, + typename _Predicate> + _OutputIterator + copy_if(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + if (__pred(*__first)) + { + *__result = *__first; + ++__result; + } + return __result; + } + + + template<typename _InputIterator, typename _Size, typename _OutputIterator> + _OutputIterator + __copy_n(_InputIterator __first, _Size __n, + _OutputIterator __result, input_iterator_tag) + { + for (; __n > 0; --__n) + { + *__result = *__first; + ++__first; + ++__result; + } + return __result; + } + + template<typename _RandomAccessIterator, typename _Size, + typename _OutputIterator> + inline _OutputIterator + __copy_n(_RandomAccessIterator __first, _Size __n, + _OutputIterator __result, random_access_iterator_tag) + { return std::copy(__first, __first + __n, __result); } + + /** + * @brief Copies the range [first,first+n) into [result,result+n). + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param n The number of elements to copy. + * @param result An output iterator. + * @return result+n. + * + * This inline function will boil down to a call to @c memmove whenever + * possible. Failing that, if random access iterators are passed, then the + * loop count will be known (and therefore a candidate for compiler + * optimizations such as unrolling). + */ + template<typename _InputIterator, typename _Size, typename _OutputIterator> + inline _OutputIterator + copy_n(_InputIterator __first, _Size __n, _OutputIterator __result) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + + return std::__copy_n(__first, __n, __result, + std::__iterator_category(__first)); + } + + /** + * @brief Copy the elements of a sequence to separate output sequences + * depending on the truth value of a predicate. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param out_true An output iterator. + * @param out_false An output iterator. + * @param pred A predicate. + * @return A pair designating the ends of the resulting sequences. + * + * Copies each element in the range @p [first,last) for which + * @p pred returns true to the range beginning at @p out_true + * and each element for which @p pred returns false to @p out_false. + */ + template<typename _InputIterator, typename _OutputIterator1, + typename _OutputIterator2, typename _Predicate> + pair<_OutputIterator1, _OutputIterator2> + partition_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator1 __out_true, _OutputIterator2 __out_false, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator1, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator2, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + if (__pred(*__first)) + { + *__out_true = *__first; + ++__out_true; + } + else + { + *__out_false = *__first; + ++__out_false; + } + + return pair<_OutputIterator1, _OutputIterator2>(__out_true, __out_false); + } +#endif + + /** + * @brief Remove elements from a sequence. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param value The value to be removed. + * @return An iterator designating the end of the resulting sequence. + * + * All elements equal to @p value are removed from the range + * @p [first,last). + * + * remove() is stable, so the relative order of elements that are + * not removed is unchanged. + * + * Elements between the end of the resulting sequence and @p last + * are still present, but their value is unspecified. + */ + template<typename _ForwardIterator, typename _Tp> + _ForwardIterator + remove(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __value) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_ForwardIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + + __first = _GLIBCXX_STD_P::find(__first, __last, __value); + if(__first == __last) + return __first; + _ForwardIterator __result = __first; + ++__first; + for(; __first != __last; ++__first) + if(!(*__first == __value)) + { + *__result = _GLIBCXX_MOVE(*__first); + ++__result; + } + return __result; + } + + /** + * @brief Remove elements from a sequence using a predicate. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param pred A predicate. + * @return An iterator designating the end of the resulting sequence. + * + * All elements for which @p pred returns true are removed from the range + * @p [first,last). + * + * remove_if() is stable, so the relative order of elements that are + * not removed is unchanged. + * + * Elements between the end of the resulting sequence and @p last + * are still present, but their value is unspecified. + */ + template<typename _ForwardIterator, typename _Predicate> + _ForwardIterator + remove_if(_ForwardIterator __first, _ForwardIterator __last, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + __first = _GLIBCXX_STD_P::find_if(__first, __last, __pred); + if(__first == __last) + return __first; + _ForwardIterator __result = __first; + ++__first; + for(; __first != __last; ++__first) + if(!bool(__pred(*__first))) + { + *__result = _GLIBCXX_MOVE(*__first); + ++__result; + } + return __result; + } + + /** + * @brief Remove consecutive duplicate values from a sequence. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @return An iterator designating the end of the resulting sequence. + * + * Removes all but the first element from each group of consecutive + * values that compare equal. + * unique() is stable, so the relative order of elements that are + * not removed is unchanged. + * Elements between the end of the resulting sequence and @p last + * are still present, but their value is unspecified. + */ + template<typename _ForwardIterator> + _ForwardIterator + unique(_ForwardIterator __first, _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_EqualityComparableConcept< + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + // Skip the beginning, if already unique. + __first = _GLIBCXX_STD_P::adjacent_find(__first, __last); + if (__first == __last) + return __last; + + // Do the real copy work. + _ForwardIterator __dest = __first; + ++__first; + while (++__first != __last) + if (!(*__dest == *__first)) + *++__dest = _GLIBCXX_MOVE(*__first); + return ++__dest; + } + + /** + * @brief Remove consecutive values from a sequence using a predicate. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param binary_pred A binary predicate. + * @return An iterator designating the end of the resulting sequence. + * + * Removes all but the first element from each group of consecutive + * values for which @p binary_pred returns true. + * unique() is stable, so the relative order of elements that are + * not removed is unchanged. + * Elements between the end of the resulting sequence and @p last + * are still present, but their value is unspecified. + */ + template<typename _ForwardIterator, typename _BinaryPredicate> + _ForwardIterator + unique(_ForwardIterator __first, _ForwardIterator __last, + _BinaryPredicate __binary_pred) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + // Skip the beginning, if already unique. + __first = _GLIBCXX_STD_P::adjacent_find(__first, __last, __binary_pred); + if (__first == __last) + return __last; + + // Do the real copy work. + _ForwardIterator __dest = __first; + ++__first; + while (++__first != __last) + if (!bool(__binary_pred(*__dest, *__first))) + *++__dest = _GLIBCXX_MOVE(*__first); + return ++__dest; + } + + /** + * This is an uglified unique_copy(_InputIterator, _InputIterator, + * _OutputIterator) + * overloaded for forward iterators and output iterator as result. + */ + template<typename _ForwardIterator, typename _OutputIterator> + _OutputIterator + __unique_copy(_ForwardIterator __first, _ForwardIterator __last, + _OutputIterator __result, + forward_iterator_tag, output_iterator_tag) + { + // concept requirements -- taken care of in dispatching function + _ForwardIterator __next = __first; + *__result = *__first; + while (++__next != __last) + if (!(*__first == *__next)) + { + __first = __next; + *++__result = *__first; + } + return ++__result; + } + + /** + * This is an uglified unique_copy(_InputIterator, _InputIterator, + * _OutputIterator) + * overloaded for input iterators and output iterator as result. + */ + template<typename _InputIterator, typename _OutputIterator> + _OutputIterator + __unique_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, + input_iterator_tag, output_iterator_tag) + { + // concept requirements -- taken care of in dispatching function + typename iterator_traits<_InputIterator>::value_type __value = *__first; + *__result = __value; + while (++__first != __last) + if (!(__value == *__first)) + { + __value = *__first; + *++__result = __value; + } + return ++__result; + } + + /** + * This is an uglified unique_copy(_InputIterator, _InputIterator, + * _OutputIterator) + * overloaded for input iterators and forward iterator as result. + */ + template<typename _InputIterator, typename _ForwardIterator> + _ForwardIterator + __unique_copy(_InputIterator __first, _InputIterator __last, + _ForwardIterator __result, + input_iterator_tag, forward_iterator_tag) + { + // concept requirements -- taken care of in dispatching function + *__result = *__first; + while (++__first != __last) + if (!(*__result == *__first)) + *++__result = *__first; + return ++__result; + } + + /** + * This is an uglified + * unique_copy(_InputIterator, _InputIterator, _OutputIterator, + * _BinaryPredicate) + * overloaded for forward iterators and output iterator as result. + */ + template<typename _ForwardIterator, typename _OutputIterator, + typename _BinaryPredicate> + _OutputIterator + __unique_copy(_ForwardIterator __first, _ForwardIterator __last, + _OutputIterator __result, _BinaryPredicate __binary_pred, + forward_iterator_tag, output_iterator_tag) + { + // concept requirements -- iterators already checked + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + + _ForwardIterator __next = __first; + *__result = *__first; + while (++__next != __last) + if (!bool(__binary_pred(*__first, *__next))) + { + __first = __next; + *++__result = *__first; + } + return ++__result; + } + + /** + * This is an uglified + * unique_copy(_InputIterator, _InputIterator, _OutputIterator, + * _BinaryPredicate) + * overloaded for input iterators and output iterator as result. + */ + template<typename _InputIterator, typename _OutputIterator, + typename _BinaryPredicate> + _OutputIterator + __unique_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, _BinaryPredicate __binary_pred, + input_iterator_tag, output_iterator_tag) + { + // concept requirements -- iterators already checked + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_InputIterator>::value_type, + typename iterator_traits<_InputIterator>::value_type>) + + typename iterator_traits<_InputIterator>::value_type __value = *__first; + *__result = __value; + while (++__first != __last) + if (!bool(__binary_pred(__value, *__first))) + { + __value = *__first; + *++__result = __value; + } + return ++__result; + } + + /** + * This is an uglified + * unique_copy(_InputIterator, _InputIterator, _OutputIterator, + * _BinaryPredicate) + * overloaded for input iterators and forward iterator as result. + */ + template<typename _InputIterator, typename _ForwardIterator, + typename _BinaryPredicate> + _ForwardIterator + __unique_copy(_InputIterator __first, _InputIterator __last, + _ForwardIterator __result, _BinaryPredicate __binary_pred, + input_iterator_tag, forward_iterator_tag) + { + // concept requirements -- iterators already checked + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_InputIterator>::value_type>) + + *__result = *__first; + while (++__first != __last) + if (!bool(__binary_pred(*__result, *__first))) + *++__result = *__first; + return ++__result; + } + + /** + * This is an uglified reverse(_BidirectionalIterator, + * _BidirectionalIterator) + * overloaded for bidirectional iterators. + */ + template<typename _BidirectionalIterator> + void + __reverse(_BidirectionalIterator __first, _BidirectionalIterator __last, + bidirectional_iterator_tag) + { + while (true) + if (__first == __last || __first == --__last) + return; + else + { + std::iter_swap(__first, __last); + ++__first; + } + } + + /** + * This is an uglified reverse(_BidirectionalIterator, + * _BidirectionalIterator) + * overloaded for random access iterators. + */ + template<typename _RandomAccessIterator> + void + __reverse(_RandomAccessIterator __first, _RandomAccessIterator __last, + random_access_iterator_tag) + { + if (__first == __last) + return; + --__last; + while (__first < __last) + { + std::iter_swap(__first, __last); + ++__first; + --__last; + } + } + + /** + * @brief Reverse a sequence. + * @ingroup mutating_algorithms + * @param first A bidirectional iterator. + * @param last A bidirectional iterator. + * @return reverse() returns no value. + * + * Reverses the order of the elements in the range @p [first,last), + * so that the first element becomes the last etc. + * For every @c i such that @p 0<=i<=(last-first)/2), @p reverse() + * swaps @p *(first+i) and @p *(last-(i+1)) + */ + template<typename _BidirectionalIterator> + inline void + reverse(_BidirectionalIterator __first, _BidirectionalIterator __last) + { + // concept requirements + __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_requires_valid_range(__first, __last); + std::__reverse(__first, __last, std::__iterator_category(__first)); + } + + /** + * @brief Copy a sequence, reversing its elements. + * @ingroup mutating_algorithms + * @param first A bidirectional iterator. + * @param last A bidirectional iterator. + * @param result An output iterator. + * @return An iterator designating the end of the resulting sequence. + * + * Copies the elements in the range @p [first,last) to the range + * @p [result,result+(last-first)) such that the order of the + * elements is reversed. + * For every @c i such that @p 0<=i<=(last-first), @p reverse_copy() + * performs the assignment @p *(result+(last-first)-i) = *(first+i). + * The ranges @p [first,last) and @p [result,result+(last-first)) + * must not overlap. + */ + template<typename _BidirectionalIterator, typename _OutputIterator> + _OutputIterator + reverse_copy(_BidirectionalIterator __first, _BidirectionalIterator __last, + _OutputIterator __result) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_BidirectionalIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + while (__first != __last) + { + --__last; + *__result = *__last; + ++__result; + } + return __result; + } + + /** + * This is a helper function for the rotate algorithm specialized on RAIs. + * It returns the greatest common divisor of two integer values. + */ + template<typename _EuclideanRingElement> + _EuclideanRingElement + __gcd(_EuclideanRingElement __m, _EuclideanRingElement __n) + { + while (__n != 0) + { + _EuclideanRingElement __t = __m % __n; + __m = __n; + __n = __t; + } + return __m; + } + + /// This is a helper function for the rotate algorithm. + template<typename _ForwardIterator> + void + __rotate(_ForwardIterator __first, + _ForwardIterator __middle, + _ForwardIterator __last, + forward_iterator_tag) + { + if (__first == __middle || __last == __middle) + return; + + _ForwardIterator __first2 = __middle; + do + { + std::iter_swap(__first, __first2); + ++__first; + ++__first2; + if (__first == __middle) + __middle = __first2; + } + while (__first2 != __last); + + __first2 = __middle; + + while (__first2 != __last) + { + std::iter_swap(__first, __first2); + ++__first; + ++__first2; + if (__first == __middle) + __middle = __first2; + else if (__first2 == __last) + __first2 = __middle; + } + } + + /// This is a helper function for the rotate algorithm. + template<typename _BidirectionalIterator> + void + __rotate(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + bidirectional_iterator_tag) + { + // concept requirements + __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< + _BidirectionalIterator>) + + if (__first == __middle || __last == __middle) + return; + + std::__reverse(__first, __middle, bidirectional_iterator_tag()); + std::__reverse(__middle, __last, bidirectional_iterator_tag()); + + while (__first != __middle && __middle != __last) + { + std::iter_swap(__first, --__last); + ++__first; + } + + if (__first == __middle) + std::__reverse(__middle, __last, bidirectional_iterator_tag()); + else + std::__reverse(__first, __middle, bidirectional_iterator_tag()); + } + + /// This is a helper function for the rotate algorithm. + template<typename _RandomAccessIterator> + void + __rotate(_RandomAccessIterator __first, + _RandomAccessIterator __middle, + _RandomAccessIterator __last, + random_access_iterator_tag) + { + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + + if (__first == __middle || __last == __middle) + return; + + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _Distance; + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + const _Distance __n = __last - __first; + const _Distance __k = __middle - __first; + const _Distance __l = __n - __k; + + if (__k == __l) + { + std::swap_ranges(__first, __middle, __middle); + return; + } + + const _Distance __d = std::__gcd(__n, __k); + + for (_Distance __i = 0; __i < __d; __i++) + { + _ValueType __tmp = _GLIBCXX_MOVE(*__first); + _RandomAccessIterator __p = __first; + + if (__k < __l) + { + for (_Distance __j = 0; __j < __l / __d; __j++) + { + if (__p > __first + __l) + { + *__p = _GLIBCXX_MOVE(*(__p - __l)); + __p -= __l; + } + + *__p = _GLIBCXX_MOVE(*(__p + __k)); + __p += __k; + } + } + else + { + for (_Distance __j = 0; __j < __k / __d - 1; __j ++) + { + if (__p < __last - __k) + { + *__p = _GLIBCXX_MOVE(*(__p + __k)); + __p += __k; + } + *__p = _GLIBCXX_MOVE(*(__p - __l)); + __p -= __l; + } + } + + *__p = _GLIBCXX_MOVE(__tmp); + ++__first; + } + } + + /** + * @brief Rotate the elements of a sequence. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param middle A forward iterator. + * @param last A forward iterator. + * @return Nothing. + * + * Rotates the elements of the range @p [first,last) by @p (middle-first) + * positions so that the element at @p middle is moved to @p first, the + * element at @p middle+1 is moved to @first+1 and so on for each element + * in the range @p [first,last). + * + * This effectively swaps the ranges @p [first,middle) and + * @p [middle,last). + * + * Performs @p *(first+(n+(last-middle))%(last-first))=*(first+n) for + * each @p n in the range @p [0,last-first). + */ + template<typename _ForwardIterator> + inline void + rotate(_ForwardIterator __first, _ForwardIterator __middle, + _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_requires_valid_range(__first, __middle); + __glibcxx_requires_valid_range(__middle, __last); + + typedef typename iterator_traits<_ForwardIterator>::iterator_category + _IterType; + std::__rotate(__first, __middle, __last, _IterType()); + } + + /** + * @brief Copy a sequence, rotating its elements. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param middle A forward iterator. + * @param last A forward iterator. + * @param result An output iterator. + * @return An iterator designating the end of the resulting sequence. + * + * Copies the elements of the range @p [first,last) to the range + * beginning at @result, rotating the copied elements by @p (middle-first) + * positions so that the element at @p middle is moved to @p result, the + * element at @p middle+1 is moved to @result+1 and so on for each element + * in the range @p [first,last). + * + * Performs @p *(result+(n+(last-middle))%(last-first))=*(first+n) for + * each @p n in the range @p [0,last-first). + */ + template<typename _ForwardIterator, typename _OutputIterator> + _OutputIterator + rotate_copy(_ForwardIterator __first, _ForwardIterator __middle, + _ForwardIterator __last, _OutputIterator __result) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __middle); + __glibcxx_requires_valid_range(__middle, __last); + + return std::copy(__first, __middle, + std::copy(__middle, __last, __result)); + } + + /// This is a helper function... + template<typename _ForwardIterator, typename _Predicate> + _ForwardIterator + __partition(_ForwardIterator __first, _ForwardIterator __last, + _Predicate __pred, forward_iterator_tag) + { + if (__first == __last) + return __first; + + while (__pred(*__first)) + if (++__first == __last) + return __first; + + _ForwardIterator __next = __first; + + while (++__next != __last) + if (__pred(*__next)) + { + std::iter_swap(__first, __next); + ++__first; + } + + return __first; + } + + /// This is a helper function... + template<typename _BidirectionalIterator, typename _Predicate> + _BidirectionalIterator + __partition(_BidirectionalIterator __first, _BidirectionalIterator __last, + _Predicate __pred, bidirectional_iterator_tag) + { + while (true) + { + while (true) + if (__first == __last) + return __first; + else if (__pred(*__first)) + ++__first; + else + break; + --__last; + while (true) + if (__first == __last) + return __first; + else if (!bool(__pred(*__last))) + --__last; + else + break; + std::iter_swap(__first, __last); + ++__first; + } + } + + // partition + + /// This is a helper function... + template<typename _ForwardIterator, typename _Predicate, typename _Distance> + _ForwardIterator + __inplace_stable_partition(_ForwardIterator __first, + _ForwardIterator __last, + _Predicate __pred, _Distance __len) + { + if (__len == 1) + return __pred(*__first) ? __last : __first; + _ForwardIterator __middle = __first; + std::advance(__middle, __len / 2); + _ForwardIterator __begin = std::__inplace_stable_partition(__first, + __middle, + __pred, + __len / 2); + _ForwardIterator __end = std::__inplace_stable_partition(__middle, __last, + __pred, + __len + - __len / 2); + std::rotate(__begin, __middle, __end); + std::advance(__begin, std::distance(__middle, __end)); + return __begin; + } + + /// This is a helper function... + template<typename _ForwardIterator, typename _Pointer, typename _Predicate, + typename _Distance> + _ForwardIterator + __stable_partition_adaptive(_ForwardIterator __first, + _ForwardIterator __last, + _Predicate __pred, _Distance __len, + _Pointer __buffer, + _Distance __buffer_size) + { + if (__len <= __buffer_size) + { + _ForwardIterator __result1 = __first; + _Pointer __result2 = __buffer; + for (; __first != __last; ++__first) + if (__pred(*__first)) + { + *__result1 = *__first; + ++__result1; + } + else + { + *__result2 = *__first; + ++__result2; + } + std::copy(__buffer, __result2, __result1); + return __result1; + } + else + { + _ForwardIterator __middle = __first; + std::advance(__middle, __len / 2); + _ForwardIterator __begin = + std::__stable_partition_adaptive(__first, __middle, __pred, + __len / 2, __buffer, + __buffer_size); + _ForwardIterator __end = + std::__stable_partition_adaptive(__middle, __last, __pred, + __len - __len / 2, + __buffer, __buffer_size); + std::rotate(__begin, __middle, __end); + std::advance(__begin, std::distance(__middle, __end)); + return __begin; + } + } + + /** + * @brief Move elements for which a predicate is true to the beginning + * of a sequence, preserving relative ordering. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param pred A predicate functor. + * @return An iterator @p middle such that @p pred(i) is true for each + * iterator @p i in the range @p [first,middle) and false for each @p i + * in the range @p [middle,last). + * + * Performs the same function as @p partition() with the additional + * guarantee that the relative ordering of elements in each group is + * preserved, so any two elements @p x and @p y in the range + * @p [first,last) such that @p pred(x)==pred(y) will have the same + * relative ordering after calling @p stable_partition(). + */ + template<typename _ForwardIterator, typename _Predicate> + _ForwardIterator + stable_partition(_ForwardIterator __first, _ForwardIterator __last, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __first; + else + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + _Temporary_buffer<_ForwardIterator, _ValueType> __buf(__first, + __last); + if (__buf.size() > 0) + return + std::__stable_partition_adaptive(__first, __last, __pred, + _DistanceType(__buf.requested_size()), + __buf.begin(), + _DistanceType(__buf.size())); + else + return + std::__inplace_stable_partition(__first, __last, __pred, + _DistanceType(__buf.requested_size())); + } + } + + /// This is a helper function for the sort routines. + template<typename _RandomAccessIterator> + void + __heap_select(_RandomAccessIterator __first, + _RandomAccessIterator __middle, + _RandomAccessIterator __last) + { + std::make_heap(__first, __middle); + for (_RandomAccessIterator __i = __middle; __i < __last; ++__i) + if (*__i < *__first) + std::__pop_heap(__first, __middle, __i); + } + + /// This is a helper function for the sort routines. + template<typename _RandomAccessIterator, typename _Compare> + void + __heap_select(_RandomAccessIterator __first, + _RandomAccessIterator __middle, + _RandomAccessIterator __last, _Compare __comp) + { + std::make_heap(__first, __middle, __comp); + for (_RandomAccessIterator __i = __middle; __i < __last; ++__i) + if (__comp(*__i, *__first)) + std::__pop_heap(__first, __middle, __i, __comp); + } + + // partial_sort + + /** + * @brief Copy the smallest elements of a sequence. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param result_first A random-access iterator. + * @param result_last Another random-access iterator. + * @return An iterator indicating the end of the resulting sequence. + * + * Copies and sorts the smallest N values from the range @p [first,last) + * to the range beginning at @p result_first, where the number of + * elements to be copied, @p N, is the smaller of @p (last-first) and + * @p (result_last-result_first). + * After the sort if @p i and @j are iterators in the range + * @p [result_first,result_first+N) such that @i precedes @j then + * @p *j<*i is false. + * The value returned is @p result_first+N. + */ + template<typename _InputIterator, typename _RandomAccessIterator> + _RandomAccessIterator + partial_sort_copy(_InputIterator __first, _InputIterator __last, + _RandomAccessIterator __result_first, + _RandomAccessIterator __result_last) + { + typedef typename iterator_traits<_InputIterator>::value_type + _InputValueType; + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _OutputValueType; + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_ConvertibleConcept<_InputValueType, + _OutputValueType>) + __glibcxx_function_requires(_LessThanOpConcept<_InputValueType, + _OutputValueType>) + __glibcxx_function_requires(_LessThanComparableConcept<_OutputValueType>) + __glibcxx_requires_valid_range(__first, __last); + __glibcxx_requires_valid_range(__result_first, __result_last); + + if (__result_first == __result_last) + return __result_last; + _RandomAccessIterator __result_real_last = __result_first; + while(__first != __last && __result_real_last != __result_last) + { + *__result_real_last = *__first; + ++__result_real_last; + ++__first; + } + std::make_heap(__result_first, __result_real_last); + while (__first != __last) + { + if (*__first < *__result_first) + std::__adjust_heap(__result_first, _DistanceType(0), + _DistanceType(__result_real_last + - __result_first), + _InputValueType(*__first)); + ++__first; + } + std::sort_heap(__result_first, __result_real_last); + return __result_real_last; + } + + /** + * @brief Copy the smallest elements of a sequence using a predicate for + * comparison. + * @ingroup sorting_algorithms + * @param first An input iterator. + * @param last Another input iterator. + * @param result_first A random-access iterator. + * @param result_last Another random-access iterator. + * @param comp A comparison functor. + * @return An iterator indicating the end of the resulting sequence. + * + * Copies and sorts the smallest N values from the range @p [first,last) + * to the range beginning at @p result_first, where the number of + * elements to be copied, @p N, is the smaller of @p (last-first) and + * @p (result_last-result_first). + * After the sort if @p i and @j are iterators in the range + * @p [result_first,result_first+N) such that @i precedes @j then + * @p comp(*j,*i) is false. + * The value returned is @p result_first+N. + */ + template<typename _InputIterator, typename _RandomAccessIterator, typename _Compare> + _RandomAccessIterator + partial_sort_copy(_InputIterator __first, _InputIterator __last, + _RandomAccessIterator __result_first, + _RandomAccessIterator __result_last, + _Compare __comp) + { + typedef typename iterator_traits<_InputIterator>::value_type + _InputValueType; + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _OutputValueType; + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_ConvertibleConcept<_InputValueType, + _OutputValueType>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _InputValueType, _OutputValueType>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _OutputValueType, _OutputValueType>) + __glibcxx_requires_valid_range(__first, __last); + __glibcxx_requires_valid_range(__result_first, __result_last); + + if (__result_first == __result_last) + return __result_last; + _RandomAccessIterator __result_real_last = __result_first; + while(__first != __last && __result_real_last != __result_last) + { + *__result_real_last = *__first; + ++__result_real_last; + ++__first; + } + std::make_heap(__result_first, __result_real_last, + __CheckedCompare(__comp)); + while (__first != __last) + { + if (__CheckedCompare(__comp)(*__first, *__result_first)) + std::__adjust_heap(__result_first, _DistanceType(0), + _DistanceType(__result_real_last + - __result_first), + _InputValueType(*__first), + __CheckedCompare(__comp)); + ++__first; + } + std::sort_heap(__result_first, __result_real_last, + __CheckedCompare(__comp)); + return __result_real_last; + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Tp> + void + __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val) + { + _RandomAccessIterator __next = __last; + --__next; + while (__val < *__next) + { + *__last = *__next; + __last = __next; + --__next; + } + *__last = __val; + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Tp, typename _Compare> + void + __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val, + _Compare __comp) + { + _RandomAccessIterator __next = __last; + --__next; + while (__comp(__val, *__next)) + { + *__last = *__next; + __last = __next; + --__next; + } + *__last = __val; + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator> + void + __insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last) + { + if (__first == __last) + return; + + for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) + { + typename iterator_traits<_RandomAccessIterator>::value_type + __val = *__i; + if (__val < *__first) + { + std::copy_backward(__first, __i, __i + 1); + *__first = __val; + } + else + std::__unguarded_linear_insert(__i, __val); + } + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Compare> + void + __insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last, _Compare __comp) + { + if (__first == __last) return; + + for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) + { + typename iterator_traits<_RandomAccessIterator>::value_type + __val = *__i; + if (__comp(__val, *__first)) + { + std::copy_backward(__first, __i, __i + 1); + *__first = __val; + } + else + std::__unguarded_linear_insert(__i, __val, __comp); + } + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator> + inline void + __unguarded_insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + for (_RandomAccessIterator __i = __first; __i != __last; ++__i) + std::__unguarded_linear_insert(__i, _ValueType(*__i)); + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Compare> + inline void + __unguarded_insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last, _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + for (_RandomAccessIterator __i = __first; __i != __last; ++__i) + std::__unguarded_linear_insert(__i, _ValueType(*__i), __comp); + } + + /** + * @doctodo + * This controls some aspect of the sort routines. + */ + enum { _S_threshold = 16 }; + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator> + void + __final_insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last) + { + if (__last - __first > int(_S_threshold)) + { + std::__insertion_sort(__first, __first + int(_S_threshold)); + std::__unguarded_insertion_sort(__first + int(_S_threshold), __last); + } + else + std::__insertion_sort(__first, __last); + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Compare> + void + __final_insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last, _Compare __comp) + { + if (__last - __first > int(_S_threshold)) + { + std::__insertion_sort(__first, __first + int(_S_threshold), __comp); + std::__unguarded_insertion_sort(__first + int(_S_threshold), __last, + __comp); + } + else + std::__insertion_sort(__first, __last, __comp); + } + + /// This is a helper function... + template<typename _RandomAccessIterator, typename _Tp> + _RandomAccessIterator + __unguarded_partition(_RandomAccessIterator __first, + _RandomAccessIterator __last, _Tp __pivot) + { + while (true) + { + while (*__first < __pivot) + ++__first; + --__last; + while (__pivot < *__last) + --__last; + if (!(__first < __last)) + return __first; + std::iter_swap(__first, __last); + ++__first; + } + } + + /// This is a helper function... + template<typename _RandomAccessIterator, typename _Tp, typename _Compare> + _RandomAccessIterator + __unguarded_partition(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Tp __pivot, _Compare __comp) + { + while (true) + { + while (__comp(*__first, __pivot)) + ++__first; + --__last; + while (__comp(__pivot, *__last)) + --__last; + if (!(__first < __last)) + return __first; + std::iter_swap(__first, __last); + ++__first; + } + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Size> + void + __introsort_loop(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Size __depth_limit) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + while (__last - __first > int(_S_threshold)) + { + if (__depth_limit == 0) + { + _GLIBCXX_STD_P::partial_sort(__first, __last, __last); + return; + } + --__depth_limit; + _RandomAccessIterator __cut = + std::__unguarded_partition(__first, __last, + _ValueType(std::__median(*__first, + *(__first + + (__last + - __first) + / 2), + *(__last + - 1)))); + std::__introsort_loop(__cut, __last, __depth_limit); + __last = __cut; + } + } + + /// This is a helper function for the sort routine. + template<typename _RandomAccessIterator, typename _Size, typename _Compare> + void + __introsort_loop(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Size __depth_limit, _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + while (__last - __first > int(_S_threshold)) + { + if (__depth_limit == 0) + { + _GLIBCXX_STD_P::partial_sort(__first, __last, __last, __comp); + return; + } + --__depth_limit; + _RandomAccessIterator __cut = + std::__unguarded_partition(__first, __last, + _ValueType(std::__median(*__first, + *(__first + + (__last + - __first) + / 2), + *(__last - 1), + __comp)), + __comp); + std::__introsort_loop(__cut, __last, __depth_limit, __comp); + __last = __cut; + } + } + + /// This is a helper function for the sort routines. Precondition: __n > 0. + template<typename _Size> + inline _Size + __lg(_Size __n) + { + _Size __k; + for (__k = 0; __n != 0; __n >>= 1) + ++__k; + return __k - 1; + } + + inline int + __lg(int __n) + { return sizeof(int) * __CHAR_BIT__ - 1 - __builtin_clz(__n); } + + inline long + __lg(long __n) + { return sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); } + + inline long long + __lg(long long __n) + { return sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); } + + // sort + + template<typename _RandomAccessIterator, typename _Size> + void + __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth, + _RandomAccessIterator __last, _Size __depth_limit) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + while (__last - __first > 3) + { + if (__depth_limit == 0) + { + std::__heap_select(__first, __nth + 1, __last); + + // Place the nth largest element in its final position. + std::iter_swap(__first, __nth); + return; + } + --__depth_limit; + _RandomAccessIterator __cut = + std::__unguarded_partition(__first, __last, + _ValueType(std::__median(*__first, + *(__first + + (__last + - __first) + / 2), + *(__last + - 1)))); + if (__cut <= __nth) + __first = __cut; + else + __last = __cut; + } + std::__insertion_sort(__first, __last); + } + + template<typename _RandomAccessIterator, typename _Size, typename _Compare> + void + __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth, + _RandomAccessIterator __last, _Size __depth_limit, + _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + while (__last - __first > 3) + { + if (__depth_limit == 0) + { + std::__heap_select(__first, __nth + 1, __last, __comp); + // Place the nth largest element in its final position. + std::iter_swap(__first, __nth); + return; + } + --__depth_limit; + _RandomAccessIterator __cut = + std::__unguarded_partition(__first, __last, + _ValueType(std::__median(*__first, + *(__first + + (__last + - __first) + / 2), + *(__last - 1), + __comp)), + __comp); + if (__cut <= __nth) + __first = __cut; + else + __last = __cut; + } + std::__insertion_sort(__first, __last, __comp); + } + + // nth_element + + /** + * @brief Finds the first position in which @a val could be inserted + * without changing the ordering. + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @return An iterator pointing to the first element "not less + * than" @a val, or end() if every element is less than + * @a val. + * @ingroup binary_search_algorithms + */ + template<typename _ForwardIterator, typename _Tp> + _ForwardIterator + lower_bound(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>) + __glibcxx_requires_partitioned_lower(__first, __last, __val); + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (*__middle < __val) + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + else + __len = __half; + } + return __first; + } + + /** + * @brief Finds the first position in which @a val could be inserted + * without changing the ordering. + * @ingroup binary_search_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @param comp A functor to use for comparisons. + * @return An iterator pointing to the first element "not less than" @a val, + * or end() if every element is less than @a val. + * @ingroup binary_search_algorithms + * + * The comparison function should have the same effects on ordering as + * the function used for the initial sort. + */ + template<typename _ForwardIterator, typename _Tp, typename _Compare> + _ForwardIterator + lower_bound(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val, _Compare __comp) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType, _Tp>) + __glibcxx_requires_partitioned_lower_pred(__first, __last, + __val, __comp); + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (__CheckedCompare(__comp)(*__middle, __val)) + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + else + __len = __half; + } + return __first; + } + + /** + * @brief Finds the last position in which @a val could be inserted + * without changing the ordering. + * @ingroup binary_search_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @return An iterator pointing to the first element greater than @a val, + * or end() if no elements are greater than @a val. + * @ingroup binary_search_algorithms + */ + template<typename _ForwardIterator, typename _Tp> + _ForwardIterator + upper_bound(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>) + __glibcxx_requires_partitioned_upper(__first, __last, __val); + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (__val < *__middle) + __len = __half; + else + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + } + return __first; + } + + /** + * @brief Finds the last position in which @a val could be inserted + * without changing the ordering. + * @ingroup binary_search_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @param comp A functor to use for comparisons. + * @return An iterator pointing to the first element greater than @a val, + * or end() if no elements are greater than @a val. + * @ingroup binary_search_algorithms + * + * The comparison function should have the same effects on ordering as + * the function used for the initial sort. + */ + template<typename _ForwardIterator, typename _Tp, typename _Compare> + _ForwardIterator + upper_bound(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val, _Compare __comp) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _Tp, _ValueType>) + __glibcxx_requires_partitioned_upper_pred(__first, __last, + __val, __comp); + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (__CheckedCompare(__comp)(__val, *__middle)) + __len = __half; + else + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + } + return __first; + } + + /** + * @brief Finds the largest subrange in which @a val could be inserted + * at any place in it without changing the ordering. + * @ingroup binary_search_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @return An pair of iterators defining the subrange. + * @ingroup binary_search_algorithms + * + * This is equivalent to + * @code + * std::make_pair(lower_bound(first, last, val), + * upper_bound(first, last, val)) + * @endcode + * but does not actually call those functions. + */ + template<typename _ForwardIterator, typename _Tp> + pair<_ForwardIterator, _ForwardIterator> + equal_range(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>) + __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>) + __glibcxx_requires_partitioned_lower(__first, __last, __val); + __glibcxx_requires_partitioned_upper(__first, __last, __val); + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle, __left, __right; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (*__middle < __val) + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + else if (__val < *__middle) + __len = __half; + else + { + __left = std::lower_bound(__first, __middle, __val); + std::advance(__first, __len); + __right = std::upper_bound(++__middle, __first, __val); + return pair<_ForwardIterator, _ForwardIterator>(__left, __right); + } + } + return pair<_ForwardIterator, _ForwardIterator>(__first, __first); + } + + /** + * @brief Finds the largest subrange in which @a val could be inserted + * at any place in it without changing the ordering. + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @param comp A functor to use for comparisons. + * @return An pair of iterators defining the subrange. + * @ingroup binary_search_algorithms + * + * This is equivalent to + * @code + * std::make_pair(lower_bound(first, last, val, comp), + * upper_bound(first, last, val, comp)) + * @endcode + * but does not actually call those functions. + */ + template<typename _ForwardIterator, typename _Tp, typename _Compare> + pair<_ForwardIterator, _ForwardIterator> + equal_range(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val, + _Compare __comp) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + typedef typename iterator_traits<_ForwardIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType, _Tp>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _Tp, _ValueType>) + __glibcxx_requires_partitioned_lower_pred(__first, __last, + __val, __comp); + __glibcxx_requires_partitioned_upper_pred(__first, __last, + __val, __comp); + + _DistanceType __len = std::distance(__first, __last); + _DistanceType __half; + _ForwardIterator __middle, __left, __right; + + while (__len > 0) + { + __half = __len >> 1; + __middle = __first; + std::advance(__middle, __half); + if (__CheckedCompare(__comp)(*__middle, __val)) + { + __first = __middle; + ++__first; + __len = __len - __half - 1; + } + else if (__CheckedCompare(__comp)(__val, *__middle)) + __len = __half; + else + { + __left = std::lower_bound(__first, __middle, __val, + __CheckedCompare(__comp)); + std::advance(__first, __len); + __right = std::upper_bound(++__middle, __first, __val, + __CheckedCompare(__comp)); + return pair<_ForwardIterator, _ForwardIterator>(__left, __right); + } + } + return pair<_ForwardIterator, _ForwardIterator>(__first, __first); + } + + /** + * @brief Determines whether an element exists in a range. + * @ingroup binary_search_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @return True if @a val (or its equivalent) is in [@a first,@a last ]. + * + * Note that this does not actually return an iterator to @a val. For + * that, use std::find or a container's specialized find member functions. + */ + template<typename _ForwardIterator, typename _Tp> + bool + binary_search(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>) + __glibcxx_requires_partitioned_lower(__first, __last, __val); + __glibcxx_requires_partitioned_upper(__first, __last, __val); + + _ForwardIterator __i = std::lower_bound(__first, __last, __val); + return __i != __last && !(__val < *__i); + } + + /** + * @brief Determines whether an element exists in a range. + * @ingroup binary_search_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param val The search term. + * @param comp A functor to use for comparisons. + * @return True if @a val (or its equivalent) is in [@a first,@a last ]. + * + * Note that this does not actually return an iterator to @a val. For + * that, use std::find or a container's specialized find member functions. + * + * The comparison function should have the same effects on ordering as + * the function used for the initial sort. + */ + template<typename _ForwardIterator, typename _Tp, typename _Compare> + bool + binary_search(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __val, _Compare __comp) + { + typedef typename iterator_traits<_ForwardIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _Tp, _ValueType>) + __glibcxx_requires_partitioned_lower_pred(__first, __last, + __val, __comp); + __glibcxx_requires_partitioned_upper_pred(__first, __last, + __val, __comp); + + _ForwardIterator __i = std::lower_bound(__first, __last, __val, + __CheckedCompare(__comp)); + return __i != __last && !bool(__CheckedCompare(__comp)(__val, *__i)); + } + + // merge + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, + typename _BidirectionalIterator3> + _BidirectionalIterator3 + __merge_backward(_BidirectionalIterator1 __first1, + _BidirectionalIterator1 __last1, + _BidirectionalIterator2 __first2, + _BidirectionalIterator2 __last2, + _BidirectionalIterator3 __result) + { + if (__first1 == __last1) + return std::copy_backward(__first2, __last2, __result); + if (__first2 == __last2) + return std::copy_backward(__first1, __last1, __result); + --__last1; + --__last2; + while (true) + { + if (*__last2 < *__last1) + { + *--__result = *__last1; + if (__first1 == __last1) + return std::copy_backward(__first2, ++__last2, __result); + --__last1; + } + else + { + *--__result = *__last2; + if (__first2 == __last2) + return std::copy_backward(__first1, ++__last1, __result); + --__last2; + } + } + } + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, + typename _BidirectionalIterator3, typename _Compare> + _BidirectionalIterator3 + __merge_backward(_BidirectionalIterator1 __first1, + _BidirectionalIterator1 __last1, + _BidirectionalIterator2 __first2, + _BidirectionalIterator2 __last2, + _BidirectionalIterator3 __result, + _Compare __comp) + { + if (__first1 == __last1) + return std::copy_backward(__first2, __last2, __result); + if (__first2 == __last2) + return std::copy_backward(__first1, __last1, __result); + --__last1; + --__last2; + while (true) + { + if (__comp(*__last2, *__last1)) + { + *--__result = *__last1; + if (__first1 == __last1) + return std::copy_backward(__first2, ++__last2, __result); + --__last1; + } + else + { + *--__result = *__last2; + if (__first2 == __last2) + return std::copy_backward(__first1, ++__last1, __result); + --__last2; + } + } + } + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, + typename _Distance> + _BidirectionalIterator1 + __rotate_adaptive(_BidirectionalIterator1 __first, + _BidirectionalIterator1 __middle, + _BidirectionalIterator1 __last, + _Distance __len1, _Distance __len2, + _BidirectionalIterator2 __buffer, + _Distance __buffer_size) + { + _BidirectionalIterator2 __buffer_end; + if (__len1 > __len2 && __len2 <= __buffer_size) + { + __buffer_end = std::copy(__middle, __last, __buffer); + std::copy_backward(__first, __middle, __last); + return std::copy(__buffer, __buffer_end, __first); + } + else if (__len1 <= __buffer_size) + { + __buffer_end = std::copy(__first, __middle, __buffer); + std::copy(__middle, __last, __first); + return std::copy_backward(__buffer, __buffer_end, __last); + } + else + { + std::rotate(__first, __middle, __last); + std::advance(__first, std::distance(__middle, __last)); + return __first; + } + } + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator, typename _Distance, + typename _Pointer> + void + __merge_adaptive(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + _Distance __len1, _Distance __len2, + _Pointer __buffer, _Distance __buffer_size) + { + if (__len1 <= __len2 && __len1 <= __buffer_size) + { + _Pointer __buffer_end = std::copy(__first, __middle, __buffer); + _GLIBCXX_STD_P::merge(__buffer, __buffer_end, __middle, __last, + __first); + } + else if (__len2 <= __buffer_size) + { + _Pointer __buffer_end = std::copy(__middle, __last, __buffer); + std::__merge_backward(__first, __middle, __buffer, + __buffer_end, __last); + } + else + { + _BidirectionalIterator __first_cut = __first; + _BidirectionalIterator __second_cut = __middle; + _Distance __len11 = 0; + _Distance __len22 = 0; + if (__len1 > __len2) + { + __len11 = __len1 / 2; + std::advance(__first_cut, __len11); + __second_cut = std::lower_bound(__middle, __last, + *__first_cut); + __len22 = std::distance(__middle, __second_cut); + } + else + { + __len22 = __len2 / 2; + std::advance(__second_cut, __len22); + __first_cut = std::upper_bound(__first, __middle, + *__second_cut); + __len11 = std::distance(__first, __first_cut); + } + _BidirectionalIterator __new_middle = + std::__rotate_adaptive(__first_cut, __middle, __second_cut, + __len1 - __len11, __len22, __buffer, + __buffer_size); + std::__merge_adaptive(__first, __first_cut, __new_middle, __len11, + __len22, __buffer, __buffer_size); + std::__merge_adaptive(__new_middle, __second_cut, __last, + __len1 - __len11, + __len2 - __len22, __buffer, __buffer_size); + } + } + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator, typename _Distance, + typename _Pointer, typename _Compare> + void + __merge_adaptive(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + _Distance __len1, _Distance __len2, + _Pointer __buffer, _Distance __buffer_size, + _Compare __comp) + { + if (__len1 <= __len2 && __len1 <= __buffer_size) + { + _Pointer __buffer_end = std::copy(__first, __middle, __buffer); + _GLIBCXX_STD_P::merge(__buffer, __buffer_end, __middle, __last, + __first, __comp); + } + else if (__len2 <= __buffer_size) + { + _Pointer __buffer_end = std::copy(__middle, __last, __buffer); + std::__merge_backward(__first, __middle, __buffer, __buffer_end, + __last, __comp); + } + else + { + _BidirectionalIterator __first_cut = __first; + _BidirectionalIterator __second_cut = __middle; + _Distance __len11 = 0; + _Distance __len22 = 0; + if (__len1 > __len2) + { + __len11 = __len1 / 2; + std::advance(__first_cut, __len11); + __second_cut = std::lower_bound(__middle, __last, *__first_cut, + __comp); + __len22 = std::distance(__middle, __second_cut); + } + else + { + __len22 = __len2 / 2; + std::advance(__second_cut, __len22); + __first_cut = std::upper_bound(__first, __middle, *__second_cut, + __comp); + __len11 = std::distance(__first, __first_cut); + } + _BidirectionalIterator __new_middle = + std::__rotate_adaptive(__first_cut, __middle, __second_cut, + __len1 - __len11, __len22, __buffer, + __buffer_size); + std::__merge_adaptive(__first, __first_cut, __new_middle, __len11, + __len22, __buffer, __buffer_size, __comp); + std::__merge_adaptive(__new_middle, __second_cut, __last, + __len1 - __len11, + __len2 - __len22, __buffer, + __buffer_size, __comp); + } + } + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator, typename _Distance> + void + __merge_without_buffer(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + _Distance __len1, _Distance __len2) + { + if (__len1 == 0 || __len2 == 0) + return; + if (__len1 + __len2 == 2) + { + if (*__middle < *__first) + std::iter_swap(__first, __middle); + return; + } + _BidirectionalIterator __first_cut = __first; + _BidirectionalIterator __second_cut = __middle; + _Distance __len11 = 0; + _Distance __len22 = 0; + if (__len1 > __len2) + { + __len11 = __len1 / 2; + std::advance(__first_cut, __len11); + __second_cut = std::lower_bound(__middle, __last, *__first_cut); + __len22 = std::distance(__middle, __second_cut); + } + else + { + __len22 = __len2 / 2; + std::advance(__second_cut, __len22); + __first_cut = std::upper_bound(__first, __middle, *__second_cut); + __len11 = std::distance(__first, __first_cut); + } + std::rotate(__first_cut, __middle, __second_cut); + _BidirectionalIterator __new_middle = __first_cut; + std::advance(__new_middle, std::distance(__middle, __second_cut)); + std::__merge_without_buffer(__first, __first_cut, __new_middle, + __len11, __len22); + std::__merge_without_buffer(__new_middle, __second_cut, __last, + __len1 - __len11, __len2 - __len22); + } + + /// This is a helper function for the merge routines. + template<typename _BidirectionalIterator, typename _Distance, + typename _Compare> + void + __merge_without_buffer(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + _Distance __len1, _Distance __len2, + _Compare __comp) + { + if (__len1 == 0 || __len2 == 0) + return; + if (__len1 + __len2 == 2) + { + if (__comp(*__middle, *__first)) + std::iter_swap(__first, __middle); + return; + } + _BidirectionalIterator __first_cut = __first; + _BidirectionalIterator __second_cut = __middle; + _Distance __len11 = 0; + _Distance __len22 = 0; + if (__len1 > __len2) + { + __len11 = __len1 / 2; + std::advance(__first_cut, __len11); + __second_cut = std::lower_bound(__middle, __last, *__first_cut, + __comp); + __len22 = std::distance(__middle, __second_cut); + } + else + { + __len22 = __len2 / 2; + std::advance(__second_cut, __len22); + __first_cut = std::upper_bound(__first, __middle, *__second_cut, + __comp); + __len11 = std::distance(__first, __first_cut); + } + std::rotate(__first_cut, __middle, __second_cut); + _BidirectionalIterator __new_middle = __first_cut; + std::advance(__new_middle, std::distance(__middle, __second_cut)); + std::__merge_without_buffer(__first, __first_cut, __new_middle, + __len11, __len22, __comp); + std::__merge_without_buffer(__new_middle, __second_cut, __last, + __len1 - __len11, __len2 - __len22, __comp); + } + + /** + * @brief Merges two sorted ranges in place. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param middle Another iterator. + * @param last Another iterator. + * @return Nothing. + * + * Merges two sorted and consecutive ranges, [first,middle) and + * [middle,last), and puts the result in [first,last). The output will + * be sorted. The sort is @e stable, that is, for equivalent + * elements in the two ranges, elements from the first range will always + * come before elements from the second. + * + * If enough additional memory is available, this takes (last-first)-1 + * comparisons. Otherwise an NlogN algorithm is used, where N is + * distance(first,last). + */ + template<typename _BidirectionalIterator> + void + inplace_merge(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last) + { + typedef typename iterator_traits<_BidirectionalIterator>::value_type + _ValueType; + typedef typename iterator_traits<_BidirectionalIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>) + __glibcxx_requires_sorted(__first, __middle); + __glibcxx_requires_sorted(__middle, __last); + + if (__first == __middle || __middle == __last) + return; + + _DistanceType __len1 = std::distance(__first, __middle); + _DistanceType __len2 = std::distance(__middle, __last); + + _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first, + __last); + if (__buf.begin() == 0) + std::__merge_without_buffer(__first, __middle, __last, __len1, __len2); + else + std::__merge_adaptive(__first, __middle, __last, __len1, __len2, + __buf.begin(), _DistanceType(__buf.size())); + } + + /** + * @brief Merges two sorted ranges in place. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param middle Another iterator. + * @param last Another iterator. + * @param comp A functor to use for comparisons. + * @return Nothing. + * + * Merges two sorted and consecutive ranges, [first,middle) and + * [middle,last), and puts the result in [first,last). The output will + * be sorted. The sort is @e stable, that is, for equivalent + * elements in the two ranges, elements from the first range will always + * come before elements from the second. + * + * If enough additional memory is available, this takes (last-first)-1 + * comparisons. Otherwise an NlogN algorithm is used, where N is + * distance(first,last). + * + * The comparison function should have the same effects on ordering as + * the function used for the initial sort. + */ + template<typename _BidirectionalIterator, typename _Compare> + void + inplace_merge(_BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + _Compare __comp) + { + typedef typename iterator_traits<_BidirectionalIterator>::value_type + _ValueType; + typedef typename iterator_traits<_BidirectionalIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType, _ValueType>) + __glibcxx_requires_sorted_pred(__first, __middle, __comp); + __glibcxx_requires_sorted_pred(__middle, __last, __comp); + + if (__first == __middle || __middle == __last) + return; + + const _DistanceType __len1 = std::distance(__first, __middle); + const _DistanceType __len2 = std::distance(__middle, __last); + + _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first, + __last); + if (__buf.begin() == 0) + std::__merge_without_buffer(__first, __middle, __last, __len1, + __len2, __CheckedCompare(__comp)); + else + std::__merge_adaptive(__first, __middle, __last, __len1, __len2, + __buf.begin(), _DistanceType(__buf.size()), + __CheckedCompare(__comp)); + } + + template<typename _RandomAccessIterator1, typename _RandomAccessIterator2, + typename _Distance> + void + __merge_sort_loop(_RandomAccessIterator1 __first, + _RandomAccessIterator1 __last, + _RandomAccessIterator2 __result, + _Distance __step_size) + { + const _Distance __two_step = 2 * __step_size; + + while (__last - __first >= __two_step) + { + __result = _GLIBCXX_STD_P::merge(__first, __first + __step_size, + __first + __step_size, + __first + __two_step, + __result); + __first += __two_step; + } + + __step_size = std::min(_Distance(__last - __first), __step_size); + _GLIBCXX_STD_P::merge(__first, __first + __step_size, + __first + __step_size, __last, + __result); + } + + template<typename _RandomAccessIterator1, typename _RandomAccessIterator2, + typename _Distance, typename _Compare> + void + __merge_sort_loop(_RandomAccessIterator1 __first, + _RandomAccessIterator1 __last, + _RandomAccessIterator2 __result, _Distance __step_size, + _Compare __comp) + { + const _Distance __two_step = 2 * __step_size; + + while (__last - __first >= __two_step) + { + __result = _GLIBCXX_STD_P::merge(__first, __first + __step_size, + __first + __step_size, __first + __two_step, + __result, + __comp); + __first += __two_step; + } + __step_size = std::min(_Distance(__last - __first), __step_size); + + _GLIBCXX_STD_P::merge(__first, __first + __step_size, + __first + __step_size, __last, __result, __comp); + } + + template<typename _RandomAccessIterator, typename _Distance> + void + __chunk_insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Distance __chunk_size) + { + while (__last - __first >= __chunk_size) + { + std::__insertion_sort(__first, __first + __chunk_size); + __first += __chunk_size; + } + std::__insertion_sort(__first, __last); + } + + template<typename _RandomAccessIterator, typename _Distance, + typename _Compare> + void + __chunk_insertion_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Distance __chunk_size, _Compare __comp) + { + while (__last - __first >= __chunk_size) + { + std::__insertion_sort(__first, __first + __chunk_size, __comp); + __first += __chunk_size; + } + std::__insertion_sort(__first, __last, __comp); + } + + enum { _S_chunk_size = 7 }; + + template<typename _RandomAccessIterator, typename _Pointer> + void + __merge_sort_with_buffer(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Pointer __buffer) + { + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _Distance; + + const _Distance __len = __last - __first; + const _Pointer __buffer_last = __buffer + __len; + + _Distance __step_size = _S_chunk_size; + std::__chunk_insertion_sort(__first, __last, __step_size); + + while (__step_size < __len) + { + std::__merge_sort_loop(__first, __last, __buffer, __step_size); + __step_size *= 2; + std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size); + __step_size *= 2; + } + } + + template<typename _RandomAccessIterator, typename _Pointer, typename _Compare> + void + __merge_sort_with_buffer(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Pointer __buffer, _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _Distance; + + const _Distance __len = __last - __first; + const _Pointer __buffer_last = __buffer + __len; + + _Distance __step_size = _S_chunk_size; + std::__chunk_insertion_sort(__first, __last, __step_size, __comp); + + while (__step_size < __len) + { + std::__merge_sort_loop(__first, __last, __buffer, + __step_size, __comp); + __step_size *= 2; + std::__merge_sort_loop(__buffer, __buffer_last, __first, + __step_size, __comp); + __step_size *= 2; + } + } + + template<typename _RandomAccessIterator, typename _Pointer, + typename _Distance> + void + __stable_sort_adaptive(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Pointer __buffer, _Distance __buffer_size) + { + const _Distance __len = (__last - __first + 1) / 2; + const _RandomAccessIterator __middle = __first + __len; + if (__len > __buffer_size) + { + std::__stable_sort_adaptive(__first, __middle, + __buffer, __buffer_size); + std::__stable_sort_adaptive(__middle, __last, + __buffer, __buffer_size); + } + else + { + std::__merge_sort_with_buffer(__first, __middle, __buffer); + std::__merge_sort_with_buffer(__middle, __last, __buffer); + } + std::__merge_adaptive(__first, __middle, __last, + _Distance(__middle - __first), + _Distance(__last - __middle), + __buffer, __buffer_size); + } + + template<typename _RandomAccessIterator, typename _Pointer, + typename _Distance, typename _Compare> + void + __stable_sort_adaptive(_RandomAccessIterator __first, + _RandomAccessIterator __last, + _Pointer __buffer, _Distance __buffer_size, + _Compare __comp) + { + const _Distance __len = (__last - __first + 1) / 2; + const _RandomAccessIterator __middle = __first + __len; + if (__len > __buffer_size) + { + std::__stable_sort_adaptive(__first, __middle, __buffer, + __buffer_size, __comp); + std::__stable_sort_adaptive(__middle, __last, __buffer, + __buffer_size, __comp); + } + else + { + std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp); + std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp); + } + std::__merge_adaptive(__first, __middle, __last, + _Distance(__middle - __first), + _Distance(__last - __middle), + __buffer, __buffer_size, + __comp); + } + + /// This is a helper function for the stable sorting routines. + template<typename _RandomAccessIterator> + void + __inplace_stable_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last) + { + if (__last - __first < 15) + { + std::__insertion_sort(__first, __last); + return; + } + _RandomAccessIterator __middle = __first + (__last - __first) / 2; + std::__inplace_stable_sort(__first, __middle); + std::__inplace_stable_sort(__middle, __last); + std::__merge_without_buffer(__first, __middle, __last, + __middle - __first, + __last - __middle); + } + + /// This is a helper function for the stable sorting routines. + template<typename _RandomAccessIterator, typename _Compare> + void + __inplace_stable_sort(_RandomAccessIterator __first, + _RandomAccessIterator __last, _Compare __comp) + { + if (__last - __first < 15) + { + std::__insertion_sort(__first, __last, __comp); + return; + } + _RandomAccessIterator __middle = __first + (__last - __first) / 2; + std::__inplace_stable_sort(__first, __middle, __comp); + std::__inplace_stable_sort(__middle, __last, __comp); + std::__merge_without_buffer(__first, __middle, __last, + __middle - __first, + __last - __middle, + __comp); + } + + // stable_sort + + // Set algorithms: includes, set_union, set_intersection, set_difference, + // set_symmetric_difference. All of these algorithms have the precondition + // that their input ranges are sorted and the postcondition that their output + // ranges are sorted. + + /** + * @brief Determines whether all elements of a sequence exists in a range. + * @param first1 Start of search range. + * @param last1 End of search range. + * @param first2 Start of sequence + * @param last2 End of sequence. + * @return True if each element in [first2,last2) is contained in order + * within [first1,last1). False otherwise. + * @ingroup set_algorithms + * + * This operation expects both [first1,last1) and [first2,last2) to be + * sorted. Searches for the presence of each element in [first2,last2) + * within [first1,last1). The iterators over each range only move forward, + * so this is a linear algorithm. If an element in [first2,last2) is not + * found before the search iterator reaches @a last2, false is returned. + */ + template<typename _InputIterator1, typename _InputIterator2> + bool + includes(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set(__first1, __last1, __first2); + __glibcxx_requires_sorted_set(__first2, __last2, __first1); + + while (__first1 != __last1 && __first2 != __last2) + if (*__first2 < *__first1) + return false; + else if(*__first1 < *__first2) + ++__first1; + else + ++__first1, ++__first2; + + return __first2 == __last2; + } + + /** + * @brief Determines whether all elements of a sequence exists in a range + * using comparison. + * @ingroup set_algorithms + * @param first1 Start of search range. + * @param last1 End of search range. + * @param first2 Start of sequence + * @param last2 End of sequence. + * @param comp Comparison function to use. + * @return True if each element in [first2,last2) is contained in order + * within [first1,last1) according to comp. False otherwise. + * @ingroup set_algorithms + * + * This operation expects both [first1,last1) and [first2,last2) to be + * sorted. Searches for the presence of each element in [first2,last2) + * within [first1,last1), using comp to decide. The iterators over each + * range only move forward, so this is a linear algorithm. If an element + * in [first2,last2) is not found before the search iterator reaches @a + * last2, false is returned. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _Compare> + bool + includes(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _Compare __comp) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType1, _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); + __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); + + while (__first1 != __last1 && __first2 != __last2) + if (__CheckedCompare(__comp)(*__first2, *__first1)) + return false; + else if(__CheckedCompare(__comp)(*__first1, *__first2)) + ++__first1; + else + ++__first1, ++__first2; + + return __first2 == __last2; + } + + // nth_element + // merge + // set_difference + // set_intersection + // set_union + // stable_sort + // set_symmetric_difference + // min_element + // max_element + + /** + * @brief Permute range into the next "dictionary" ordering. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @return False if wrapped to first permutation, true otherwise. + * + * Treats all permutations of the range as a set of "dictionary" sorted + * sequences. Permutes the current sequence into the next one of this set. + * Returns true if there are more sequences to generate. If the sequence + * is the largest of the set, the smallest is generated and false returned. + */ + template<typename _BidirectionalIterator> + bool + next_permutation(_BidirectionalIterator __first, + _BidirectionalIterator __last) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_LessThanComparableConcept< + typename iterator_traits<_BidirectionalIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return false; + _BidirectionalIterator __i = __first; + ++__i; + if (__i == __last) + return false; + __i = __last; + --__i; + + for(;;) + { + _BidirectionalIterator __ii = __i; + --__i; + if (*__i < *__ii) + { + _BidirectionalIterator __j = __last; + while (!(*__i < *--__j)) + {} + std::iter_swap(__i, __j); + std::reverse(__ii, __last); + return true; + } + if (__i == __first) + { + std::reverse(__first, __last); + return false; + } + } + } + + /** + * @brief Permute range into the next "dictionary" ordering using + * comparison functor. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @param comp A comparison functor. + * @return False if wrapped to first permutation, true otherwise. + * + * Treats all permutations of the range [first,last) as a set of + * "dictionary" sorted sequences ordered by @a comp. Permutes the current + * sequence into the next one of this set. Returns true if there are more + * sequences to generate. If the sequence is the largest of the set, the + * smallest is generated and false returned. + */ + template<typename _BidirectionalIterator, typename _Compare> + bool + next_permutation(_BidirectionalIterator __first, + _BidirectionalIterator __last, _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + typename iterator_traits<_BidirectionalIterator>::value_type, + typename iterator_traits<_BidirectionalIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return false; + _BidirectionalIterator __i = __first; + ++__i; + if (__i == __last) + return false; + __i = __last; + --__i; + + for(;;) + { + _BidirectionalIterator __ii = __i; + --__i; + if (__CheckedCompare(__comp)(*__i, *__ii)) + { + _BidirectionalIterator __j = __last; + while (!bool(__CheckedCompare(__comp)(*__i, *--__j))) + {} + std::iter_swap(__i, __j); + std::reverse(__ii, __last); + return true; + } + if (__i == __first) + { + std::reverse(__first, __last); + return false; + } + } + } + + /** + * @brief Permute range into the previous "dictionary" ordering. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @return False if wrapped to last permutation, true otherwise. + * + * Treats all permutations of the range as a set of "dictionary" sorted + * sequences. Permutes the current sequence into the previous one of this + * set. Returns true if there are more sequences to generate. If the + * sequence is the smallest of the set, the largest is generated and false + * returned. + */ + template<typename _BidirectionalIterator> + bool + prev_permutation(_BidirectionalIterator __first, + _BidirectionalIterator __last) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_LessThanComparableConcept< + typename iterator_traits<_BidirectionalIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return false; + _BidirectionalIterator __i = __first; + ++__i; + if (__i == __last) + return false; + __i = __last; + --__i; + + for(;;) + { + _BidirectionalIterator __ii = __i; + --__i; + if (*__ii < *__i) + { + _BidirectionalIterator __j = __last; + while (!(*--__j < *__i)) + {} + std::iter_swap(__i, __j); + std::reverse(__ii, __last); + return true; + } + if (__i == __first) + { + std::reverse(__first, __last); + return false; + } + } + } + + /** + * @brief Permute range into the previous "dictionary" ordering using + * comparison functor. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @param comp A comparison functor. + * @return False if wrapped to last permutation, true otherwise. + * + * Treats all permutations of the range [first,last) as a set of + * "dictionary" sorted sequences ordered by @a comp. Permutes the current + * sequence into the previous one of this set. Returns true if there are + * more sequences to generate. If the sequence is the smallest of the set, + * the largest is generated and false returned. + */ + template<typename _BidirectionalIterator, typename _Compare> + bool + prev_permutation(_BidirectionalIterator __first, + _BidirectionalIterator __last, _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_BidirectionalIteratorConcept< + _BidirectionalIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + typename iterator_traits<_BidirectionalIterator>::value_type, + typename iterator_traits<_BidirectionalIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return false; + _BidirectionalIterator __i = __first; + ++__i; + if (__i == __last) + return false; + __i = __last; + --__i; + + for(;;) + { + _BidirectionalIterator __ii = __i; + --__i; + if (__CheckedCompare(__comp)(*__ii, *__i)) + { + _BidirectionalIterator __j = __last; + while (!bool(__CheckedCompare(__comp)(*--__j, *__i))) + {} + std::iter_swap(__i, __j); + std::reverse(__ii, __last); + return true; + } + if (__i == __first) + { + std::reverse(__first, __last); + return false; + } + } + } + + // replace + // replace_if + + /** + * @brief Copy a sequence, replacing each element of one value with another + * value. + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param old_value The value to be replaced. + * @param new_value The replacement value. + * @return The end of the output sequence, @p result+(last-first). + * + * Copies each element in the input range @p [first,last) to the + * output range @p [result,result+(last-first)) replacing elements + * equal to @p old_value with @p new_value. + */ + template<typename _InputIterator, typename _OutputIterator, typename _Tp> + _OutputIterator + replace_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, + const _Tp& __old_value, const _Tp& __new_value) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_InputIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first, ++__result) + if (*__first == __old_value) + *__result = __new_value; + else + *__result = *__first; + return __result; + } + + /** + * @brief Copy a sequence, replacing each value for which a predicate + * returns true with another value. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param pred A predicate. + * @param new_value The replacement value. + * @return The end of the output sequence, @p result+(last-first). + * + * Copies each element in the range @p [first,last) to the range + * @p [result,result+(last-first)) replacing elements for which + * @p pred returns true with @p new_value. + */ + template<typename _InputIterator, typename _OutputIterator, + typename _Predicate, typename _Tp> + _OutputIterator + replace_copy_if(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, + _Predicate __pred, const _Tp& __new_value) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first, ++__result) + if (__pred(*__first)) + *__result = __new_value; + else + *__result = *__first; + return __result; + } + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /** + * @brief Determines whether the elements of a sequence are sorted. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @return True if the elements are sorted, false otherwise. + */ + template<typename _ForwardIterator> + inline bool + is_sorted(_ForwardIterator __first, _ForwardIterator __last) + { return std::is_sorted_until(__first, __last) == __last; } + + /** + * @brief Determines whether the elements of a sequence are sorted + * according to a comparison functor. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param comp A comparison functor. + * @return True if the elements are sorted, false otherwise. + */ + template<typename _ForwardIterator, typename _Compare> + inline bool + is_sorted(_ForwardIterator __first, _ForwardIterator __last, + _Compare __comp) + { return std::is_sorted_until(__first, __last, __comp) == __last; } + + /** + * @brief Determines the end of a sorted sequence. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @return An iterator pointing to the last iterator i in [first, last) + * for which the range [first, i) is sorted. + */ + template<typename _ForwardIterator> + _ForwardIterator + is_sorted_until(_ForwardIterator __first, _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanComparableConcept< + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __last; + + _ForwardIterator __next = __first; + for (++__next; __next != __last; __first = __next, ++__next) + if (*__next < *__first) + return __next; + return __next; + } + + /** + * @brief Determines the end of a sorted sequence using comparison functor. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param comp A comparison functor. + * @return An iterator pointing to the last iterator i in [first, last) + * for which the range [first, i) is sorted. + */ + template<typename _ForwardIterator, typename _Compare> + _ForwardIterator + is_sorted_until(_ForwardIterator __first, _ForwardIterator __last, + _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __last; + + _ForwardIterator __next = __first; + for (++__next; __next != __last; __first = __next, ++__next) + if (__CheckedCompare(__comp)(*__next, *__first)) + return __next; + return __next; + } + + /** + * @brief Determines min and max at once as an ordered pair. + * @ingroup sorting_algorithms + * @param a A thing of arbitrary type. + * @param b Another thing of arbitrary type. + * @return A pair(b, a) if b is smaller than a, pair(a, b) otherwise. + */ + template<typename _Tp> + inline pair<const _Tp&, const _Tp&> + minmax(const _Tp& __a, const _Tp& __b) + { + // concept requirements + __glibcxx_function_requires(_LessThanComparableConcept<_Tp>) + + return __b < __a ? pair<const _Tp&, const _Tp&>(__b, __a) + : pair<const _Tp&, const _Tp&>(__a, __b); + } + + /** + * @brief Determines min and max at once as an ordered pair. + * @ingroup sorting_algorithms + * @param a A thing of arbitrary type. + * @param b Another thing of arbitrary type. + * @param comp A @link comparison_functor comparison functor@endlink. + * @return A pair(b, a) if b is smaller than a, pair(a, b) otherwise. + */ + template<typename _Tp, typename _Compare> + inline pair<const _Tp&, const _Tp&> + minmax(const _Tp& __a, const _Tp& __b, _Compare __comp) + { + return __CheckedCompare(__comp)(__b, __a) + ? pair<const _Tp&, const _Tp&>(__b, __a) + : pair<const _Tp&, const _Tp&>(__a, __b); + } + + /** + * @brief Return a pair of iterators pointing to the minimum and maximum + * elements in a range. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @return make_pair(m, M), where m is the first iterator i in + * [first, last) such that no other element in the range is + * smaller, and where M is the last iterator i in [first, last) + * such that no other element in the range is larger. + */ + template<typename _ForwardIterator> + pair<_ForwardIterator, _ForwardIterator> + minmax_element(_ForwardIterator __first, _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanComparableConcept< + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + _ForwardIterator __next = __first; + if (__first == __last + || ++__next == __last) + return std::make_pair(__first, __first); + + _ForwardIterator __min, __max; + if (*__next < *__first) + { + __min = __next; + __max = __first; + } + else + { + __min = __first; + __max = __next; + } + + __first = __next; + ++__first; + + while (__first != __last) + { + __next = __first; + if (++__next == __last) + { + if (*__first < *__min) + __min = __first; + else if (!(*__first < *__max)) + __max = __first; + break; + } + + if (*__next < *__first) + { + if (*__next < *__min) + __min = __next; + if (!(*__first < *__max)) + __max = __first; + } + else + { + if (*__first < *__min) + __min = __first; + if (!(*__next < *__max)) + __max = __next; + } + + __first = __next; + ++__first; + } + + return std::make_pair(__min, __max); + } + + /** + * @brief Return a pair of iterators pointing to the minimum and maximum + * elements in a range. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @param comp Comparison functor. + * @return make_pair(m, M), where m is the first iterator i in + * [first, last) such that no other element in the range is + * smaller, and where M is the last iterator i in [first, last) + * such that no other element in the range is larger. + */ + template<typename _ForwardIterator, typename _Compare> + pair<_ForwardIterator, _ForwardIterator> + minmax_element(_ForwardIterator __first, _ForwardIterator __last, + _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + _ForwardIterator __next = __first; + if (__first == __last + || ++__next == __last) + return std::make_pair(__first, __first); + + _ForwardIterator __min, __max; + if (__CheckedCompare(__comp)(*__next, *__first)) + { + __min = __next; + __max = __first; + } + else + { + __min = __first; + __max = __next; + } + + __first = __next; + ++__first; + + while (__first != __last) + { + __next = __first; + if (++__next == __last) + { + if (__CheckedCompare(__comp)(*__first, *__min)) + __min = __first; + else if (!__CheckedCompare(__comp)(*__first, *__max)) + __max = __first; + break; + } + + if (__CheckedCompare(__comp)(*__next, *__first)) + { + if (__CheckedCompare(__comp)(*__next, *__min)) + __min = __next; + if (!__CheckedCompare(__comp)(*__first, *__max)) + __max = __first; + } + else + { + if (__CheckedCompare(__comp)(*__first, *__min)) + __min = __first; + if (!__CheckedCompare(__comp)(*__next, *__max)) + __max = __next; + } + + __first = __next; + ++__first; + } + + return std::make_pair(__min, __max); + } + + // N2722 + fixes. + template<typename _Tp> + inline _Tp + min(initializer_list<_Tp> __l) + { return *std::min_element(__l.begin(), __l.end()); } + + template<typename _Tp, typename _Compare> + inline _Tp + min(initializer_list<_Tp> __l, _Compare __comp) + { return *std::min_element(__l.begin(), __l.end(), __comp); } + + template<typename _Tp> + inline _Tp + max(initializer_list<_Tp> __l) + { return *std::max_element(__l.begin(), __l.end()); } + + template<typename _Tp, typename _Compare> + inline _Tp + max(initializer_list<_Tp> __l, _Compare __comp) + { return *std::max_element(__l.begin(), __l.end(), __comp); } + + template<typename _Tp> + inline pair<_Tp, _Tp> + minmax(initializer_list<_Tp> __l) + { + pair<const _Tp*, const _Tp*> __p = + std::minmax_element(__l.begin(), __l.end()); + return std::make_pair(*__p.first, *__p.second); + } + + template<typename _Tp, typename _Compare> + inline pair<_Tp, _Tp> + minmax(initializer_list<_Tp> __l, _Compare __comp) + { + pair<const _Tp*, const _Tp*> __p = + std::minmax_element(__l.begin(), __l.end(), __comp); + return std::make_pair(*__p.first, *__p.second); + } +#endif // __GXX_EXPERIMENTAL_CXX0X__ + +_GLIBCXX_END_NAMESPACE + +_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P) + + /** + * @brief Apply a function to every element of a sequence. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param f A unary function object. + * @return @p f. + * + * Applies the function object @p f to each element in the range + * @p [first,last). @p f must not modify the order of the sequence. + * If @p f has a return value it is ignored. + */ + template<typename _InputIterator, typename _Function> + _Function + for_each(_InputIterator __first, _InputIterator __last, _Function __f) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_requires_valid_range(__first, __last); + for (; __first != __last; ++__first) + __f(*__first); + return __f; + } + + /** + * @brief Find the first occurrence of a value in a sequence. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param val The value to find. + * @return The first iterator @c i in the range @p [first,last) + * such that @c *i == @p val, or @p last if no such iterator exists. + */ + template<typename _InputIterator, typename _Tp> + inline _InputIterator + find(_InputIterator __first, _InputIterator __last, + const _Tp& __val) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_InputIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + return std::__find(__first, __last, __val, + std::__iterator_category(__first)); + } + + /** + * @brief Find the first element in a sequence for which a + * predicate is true. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return The first iterator @c i in the range @p [first,last) + * such that @p pred(*i) is true, or @p last if no such iterator exists. + */ + template<typename _InputIterator, typename _Predicate> + inline _InputIterator + find_if(_InputIterator __first, _InputIterator __last, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + return std::__find_if(__first, __last, __pred, + std::__iterator_category(__first)); + } + + /** + * @brief Find element from a set in a sequence. + * @ingroup non_mutating_algorithms + * @param first1 Start of range to search. + * @param last1 End of range to search. + * @param first2 Start of match candidates. + * @param last2 End of match candidates. + * @return The first iterator @c i in the range + * @p [first1,last1) such that @c *i == @p *(i2) such that i2 is an + * iterator in [first2,last2), or @p last1 if no such iterator exists. + * + * Searches the range @p [first1,last1) for an element that is equal to + * some element in the range [first2,last2). If found, returns an iterator + * in the range [first1,last1), otherwise returns @p last1. + */ + template<typename _InputIterator, typename _ForwardIterator> + _InputIterator + find_first_of(_InputIterator __first1, _InputIterator __last1, + _ForwardIterator __first2, _ForwardIterator __last2) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_InputIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first1, __last1); + __glibcxx_requires_valid_range(__first2, __last2); + + for (; __first1 != __last1; ++__first1) + for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter) + if (*__first1 == *__iter) + return __first1; + return __last1; + } + + /** + * @brief Find element from a set in a sequence using a predicate. + * @ingroup non_mutating_algorithms + * @param first1 Start of range to search. + * @param last1 End of range to search. + * @param first2 Start of match candidates. + * @param last2 End of match candidates. + * @param comp Predicate to use. + * @return The first iterator @c i in the range + * @p [first1,last1) such that @c comp(*i, @p *(i2)) is true and i2 is an + * iterator in [first2,last2), or @p last1 if no such iterator exists. + * + + * Searches the range @p [first1,last1) for an element that is + * equal to some element in the range [first2,last2). If found, + * returns an iterator in the range [first1,last1), otherwise + * returns @p last1. + */ + template<typename _InputIterator, typename _ForwardIterator, + typename _BinaryPredicate> + _InputIterator + find_first_of(_InputIterator __first1, _InputIterator __last1, + _ForwardIterator __first2, _ForwardIterator __last2, + _BinaryPredicate __comp) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_InputIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first1, __last1); + __glibcxx_requires_valid_range(__first2, __last2); + + for (; __first1 != __last1; ++__first1) + for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter) + if (__comp(*__first1, *__iter)) + return __first1; + return __last1; + } + + /** + * @brief Find two adjacent values in a sequence that are equal. + * @ingroup non_mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @return The first iterator @c i such that @c i and @c i+1 are both + * valid iterators in @p [first,last) and such that @c *i == @c *(i+1), + * or @p last if no such iterator exists. + */ + template<typename _ForwardIterator> + _ForwardIterator + adjacent_find(_ForwardIterator __first, _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_EqualityComparableConcept< + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + if (__first == __last) + return __last; + _ForwardIterator __next = __first; + while(++__next != __last) + { + if (*__first == *__next) + return __first; + __first = __next; + } + return __last; + } + + /** + * @brief Find two adjacent values in a sequence using a predicate. + * @ingroup non_mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param binary_pred A binary predicate. + * @return The first iterator @c i such that @c i and @c i+1 are both + * valid iterators in @p [first,last) and such that + * @p binary_pred(*i,*(i+1)) is true, or @p last if no such iterator + * exists. + */ + template<typename _ForwardIterator, typename _BinaryPredicate> + _ForwardIterator + adjacent_find(_ForwardIterator __first, _ForwardIterator __last, + _BinaryPredicate __binary_pred) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + if (__first == __last) + return __last; + _ForwardIterator __next = __first; + while(++__next != __last) + { + if (__binary_pred(*__first, *__next)) + return __first; + __first = __next; + } + return __last; + } + + /** + * @brief Count the number of copies of a value in a sequence. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param value The value to be counted. + * @return The number of iterators @c i in the range @p [first,last) + * for which @c *i == @p value + */ + template<typename _InputIterator, typename _Tp> + typename iterator_traits<_InputIterator>::difference_type + count(_InputIterator __first, _InputIterator __last, const _Tp& __value) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_InputIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + typename iterator_traits<_InputIterator>::difference_type __n = 0; + for (; __first != __last; ++__first) + if (*__first == __value) + ++__n; + return __n; + } + + /** + * @brief Count the elements of a sequence for which a predicate is true. + * @ingroup non_mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param pred A predicate. + * @return The number of iterators @c i in the range @p [first,last) + * for which @p pred(*i) is true. + */ + template<typename _InputIterator, typename _Predicate> + typename iterator_traits<_InputIterator>::difference_type + count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + typename iterator_traits<_InputIterator>::difference_type __n = 0; + for (; __first != __last; ++__first) + if (__pred(*__first)) + ++__n; + return __n; + } + + /** + * @brief Search a sequence for a matching sub-sequence. + * @ingroup non_mutating_algorithms + * @param first1 A forward iterator. + * @param last1 A forward iterator. + * @param first2 A forward iterator. + * @param last2 A forward iterator. + * @return The first iterator @c i in the range + * @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N) + * for each @c N in the range @p [0,last2-first2), or @p last1 if no + * such iterator exists. + * + * Searches the range @p [first1,last1) for a sub-sequence that compares + * equal value-by-value with the sequence given by @p [first2,last2) and + * returns an iterator to the first element of the sub-sequence, or + * @p last1 if the sub-sequence is not found. + * + * Because the sub-sequence must lie completely within the range + * @p [first1,last1) it must start at a position less than + * @p last1-(last2-first2) where @p last2-first2 is the length of the + * sub-sequence. + * This means that the returned iterator @c i will be in the range + * @p [first1,last1-(last2-first2)) + */ + template<typename _ForwardIterator1, typename _ForwardIterator2> + _ForwardIterator1 + search(_ForwardIterator1 __first1, _ForwardIterator1 __last1, + _ForwardIterator2 __first2, _ForwardIterator2 __last2) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_ForwardIterator1>::value_type, + typename iterator_traits<_ForwardIterator2>::value_type>) + __glibcxx_requires_valid_range(__first1, __last1); + __glibcxx_requires_valid_range(__first2, __last2); + + // Test for empty ranges + if (__first1 == __last1 || __first2 == __last2) + return __first1; + + // Test for a pattern of length 1. + _ForwardIterator2 __p1(__first2); + if (++__p1 == __last2) + return _GLIBCXX_STD_P::find(__first1, __last1, *__first2); + + // General case. + _ForwardIterator2 __p; + _ForwardIterator1 __current = __first1; + + for (;;) + { + __first1 = _GLIBCXX_STD_P::find(__first1, __last1, *__first2); + if (__first1 == __last1) + return __last1; + + __p = __p1; + __current = __first1; + if (++__current == __last1) + return __last1; + + while (*__current == *__p) + { + if (++__p == __last2) + return __first1; + if (++__current == __last1) + return __last1; + } + ++__first1; + } + return __first1; + } + + /** + * @brief Search a sequence for a matching sub-sequence using a predicate. + * @ingroup non_mutating_algorithms + * @param first1 A forward iterator. + * @param last1 A forward iterator. + * @param first2 A forward iterator. + * @param last2 A forward iterator. + * @param predicate A binary predicate. + * @return The first iterator @c i in the range + * @p [first1,last1-(last2-first2)) such that + * @p predicate(*(i+N),*(first2+N)) is true for each @c N in the range + * @p [0,last2-first2), or @p last1 if no such iterator exists. + * + * Searches the range @p [first1,last1) for a sub-sequence that compares + * equal value-by-value with the sequence given by @p [first2,last2), + * using @p predicate to determine equality, and returns an iterator + * to the first element of the sub-sequence, or @p last1 if no such + * iterator exists. + * + * @see search(_ForwardIter1, _ForwardIter1, _ForwardIter2, _ForwardIter2) + */ + template<typename _ForwardIterator1, typename _ForwardIterator2, + typename _BinaryPredicate> + _ForwardIterator1 + search(_ForwardIterator1 __first1, _ForwardIterator1 __last1, + _ForwardIterator2 __first2, _ForwardIterator2 __last2, + _BinaryPredicate __predicate) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator1>::value_type, + typename iterator_traits<_ForwardIterator2>::value_type>) + __glibcxx_requires_valid_range(__first1, __last1); + __glibcxx_requires_valid_range(__first2, __last2); + + // Test for empty ranges + if (__first1 == __last1 || __first2 == __last2) + return __first1; + + // Test for a pattern of length 1. + _ForwardIterator2 __p1(__first2); + if (++__p1 == __last2) + { + while (__first1 != __last1 + && !bool(__predicate(*__first1, *__first2))) + ++__first1; + return __first1; + } + + // General case. + _ForwardIterator2 __p; + _ForwardIterator1 __current = __first1; + + for (;;) + { + while (__first1 != __last1 + && !bool(__predicate(*__first1, *__first2))) + ++__first1; + if (__first1 == __last1) + return __last1; + + __p = __p1; + __current = __first1; + if (++__current == __last1) + return __last1; + + while (__predicate(*__current, *__p)) + { + if (++__p == __last2) + return __first1; + if (++__current == __last1) + return __last1; + } + ++__first1; + } + return __first1; + } + + + /** + * @brief Search a sequence for a number of consecutive values. + * @ingroup non_mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param count The number of consecutive values. + * @param val The value to find. + * @return The first iterator @c i in the range @p [first,last-count) + * such that @c *(i+N) == @p val for each @c N in the range @p [0,count), + * or @p last if no such iterator exists. + * + * Searches the range @p [first,last) for @p count consecutive elements + * equal to @p val. + */ + template<typename _ForwardIterator, typename _Integer, typename _Tp> + _ForwardIterator + search_n(_ForwardIterator __first, _ForwardIterator __last, + _Integer __count, const _Tp& __val) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_ForwardIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + + if (__count <= 0) + return __first; + if (__count == 1) + return _GLIBCXX_STD_P::find(__first, __last, __val); + return std::__search_n(__first, __last, __count, __val, + std::__iterator_category(__first)); + } + + + /** + * @brief Search a sequence for a number of consecutive values using a + * predicate. + * @ingroup non_mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param count The number of consecutive values. + * @param val The value to find. + * @param binary_pred A binary predicate. + * @return The first iterator @c i in the range @p [first,last-count) + * such that @p binary_pred(*(i+N),val) is true for each @c N in the + * range @p [0,count), or @p last if no such iterator exists. + * + * Searches the range @p [first,last) for @p count consecutive elements + * for which the predicate returns true. + */ + template<typename _ForwardIterator, typename _Integer, typename _Tp, + typename _BinaryPredicate> + _ForwardIterator + search_n(_ForwardIterator __first, _ForwardIterator __last, + _Integer __count, const _Tp& __val, + _BinaryPredicate __binary_pred) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, + typename iterator_traits<_ForwardIterator>::value_type, _Tp>) + __glibcxx_requires_valid_range(__first, __last); + + if (__count <= 0) + return __first; + if (__count == 1) + { + while (__first != __last && !bool(__binary_pred(*__first, __val))) + ++__first; + return __first; + } + return std::__search_n(__first, __last, __count, __val, __binary_pred, + std::__iterator_category(__first)); + } + + + /** + * @brief Perform an operation on a sequence. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param unary_op A unary operator. + * @return An output iterator equal to @p result+(last-first). + * + * Applies the operator to each element in the input range and assigns + * the results to successive elements of the output sequence. + * Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the + * range @p [0,last-first). + * + * @p unary_op must not alter its argument. + */ + template<typename _InputIterator, typename _OutputIterator, + typename _UnaryOperation> + _OutputIterator + transform(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, _UnaryOperation __unary_op) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + // "the type returned by a _UnaryOperation" + __typeof__(__unary_op(*__first))>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first, ++__result) + *__result = __unary_op(*__first); + return __result; + } + + /** + * @brief Perform an operation on corresponding elements of two sequences. + * @ingroup mutating_algorithms + * @param first1 An input iterator. + * @param last1 An input iterator. + * @param first2 An input iterator. + * @param result An output iterator. + * @param binary_op A binary operator. + * @return An output iterator equal to @p result+(last-first). + * + * Applies the operator to the corresponding elements in the two + * input ranges and assigns the results to successive elements of the + * output sequence. + * Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each + * @c N in the range @p [0,last1-first1). + * + * @p binary_op must not alter either of its arguments. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator, typename _BinaryOperation> + _OutputIterator + transform(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _OutputIterator __result, + _BinaryOperation __binary_op) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + // "the type returned by a _BinaryOperation" + __typeof__(__binary_op(*__first1,*__first2))>) + __glibcxx_requires_valid_range(__first1, __last1); + + for (; __first1 != __last1; ++__first1, ++__first2, ++__result) + *__result = __binary_op(*__first1, *__first2); + return __result; + } + + /** + * @brief Replace each occurrence of one value in a sequence with another + * value. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param old_value The value to be replaced. + * @param new_value The replacement value. + * @return replace() returns no value. + * + * For each iterator @c i in the range @p [first,last) if @c *i == + * @p old_value then the assignment @c *i = @p new_value is performed. + */ + template<typename _ForwardIterator, typename _Tp> + void + replace(_ForwardIterator __first, _ForwardIterator __last, + const _Tp& __old_value, const _Tp& __new_value) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_EqualOpConcept< + typename iterator_traits<_ForwardIterator>::value_type, _Tp>) + __glibcxx_function_requires(_ConvertibleConcept<_Tp, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + if (*__first == __old_value) + *__first = __new_value; + } + + /** + * @brief Replace each value in a sequence for which a predicate returns + * true with another value. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param pred A predicate. + * @param new_value The replacement value. + * @return replace_if() returns no value. + * + * For each iterator @c i in the range @p [first,last) if @p pred(*i) + * is true then the assignment @c *i = @p new_value is performed. + */ + template<typename _ForwardIterator, typename _Predicate, typename _Tp> + void + replace_if(_ForwardIterator __first, _ForwardIterator __last, + _Predicate __pred, const _Tp& __new_value) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_ConvertibleConcept<_Tp, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + if (__pred(*__first)) + *__first = __new_value; + } + + /** + * @brief Assign the result of a function object to each value in a + * sequence. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param gen A function object taking no arguments and returning + * std::iterator_traits<_ForwardIterator>::value_type + * @return generate() returns no value. + * + * Performs the assignment @c *i = @p gen() for each @c i in the range + * @p [first,last). + */ + template<typename _ForwardIterator, typename _Generator> + void + generate(_ForwardIterator __first, _ForwardIterator __last, + _Generator __gen) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_GeneratorConcept<_Generator, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + for (; __first != __last; ++__first) + *__first = __gen(); + } + + /** + * @brief Assign the result of a function object to each value in a + * sequence. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param n The length of the sequence. + * @param gen A function object taking no arguments and returning + * std::iterator_traits<_ForwardIterator>::value_type + * @return The end of the sequence, @p first+n + * + * Performs the assignment @c *i = @p gen() for each @c i in the range + * @p [first,first+n). + */ + template<typename _OutputIterator, typename _Size, typename _Generator> + _OutputIterator + generate_n(_OutputIterator __first, _Size __n, _Generator __gen) + { + // concept requirements + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + // "the type returned by a _Generator" + __typeof__(__gen())>) + + for (; __n > 0; --__n, ++__first) + *__first = __gen(); + return __first; + } + + + /** + * @brief Copy a sequence, removing consecutive duplicate values. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @return An iterator designating the end of the resulting sequence. + * + * Copies each element in the range @p [first,last) to the range + * beginning at @p result, except that only the first element is copied + * from groups of consecutive elements that compare equal. + * unique_copy() is stable, so the relative order of elements that are + * copied is unchanged. + * + * _GLIBCXX_RESOLVE_LIB_DEFECTS + * DR 241. Does unique_copy() require CopyConstructible and Assignable? + * + * _GLIBCXX_RESOLVE_LIB_DEFECTS + * DR 538. 241 again: Does unique_copy() require CopyConstructible and + * Assignable? + */ + template<typename _InputIterator, typename _OutputIterator> + inline _OutputIterator + unique_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator __result) + { + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_function_requires(_EqualityComparableConcept< + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __result; + return std::__unique_copy(__first, __last, __result, + std::__iterator_category(__first), + std::__iterator_category(__result)); + } + + /** + * @brief Copy a sequence, removing consecutive values using a predicate. + * @ingroup mutating_algorithms + * @param first An input iterator. + * @param last An input iterator. + * @param result An output iterator. + * @param binary_pred A binary predicate. + * @return An iterator designating the end of the resulting sequence. + * + * Copies each element in the range @p [first,last) to the range + * beginning at @p result, except that only the first element is copied + * from groups of consecutive elements for which @p binary_pred returns + * true. + * unique_copy() is stable, so the relative order of elements that are + * copied is unchanged. + * + * _GLIBCXX_RESOLVE_LIB_DEFECTS + * DR 241. Does unique_copy() require CopyConstructible and Assignable? + */ + template<typename _InputIterator, typename _OutputIterator, + typename _BinaryPredicate> + inline _OutputIterator + unique_copy(_InputIterator __first, _InputIterator __last, + _OutputIterator __result, + _BinaryPredicate __binary_pred) + { + // concept requirements -- predicates checked later + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + typename iterator_traits<_InputIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __result; + return std::__unique_copy(__first, __last, __result, __binary_pred, + std::__iterator_category(__first), + std::__iterator_category(__result)); + } + + + /** + * @brief Randomly shuffle the elements of a sequence. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @return Nothing. + * + * Reorder the elements in the range @p [first,last) using a random + * distribution, so that every possible ordering of the sequence is + * equally likely. + */ + template<typename _RandomAccessIterator> + inline void + random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last) + { + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first != __last) + for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) + std::iter_swap(__i, __first + (std::rand() % ((__i - __first) + 1))); + } + + /** + * @brief Shuffle the elements of a sequence using a random number + * generator. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param rand The RNG functor or function. + * @return Nothing. + * + * Reorders the elements in the range @p [first,last) using @p rand to + * provide a random distribution. Calling @p rand(N) for a positive + * integer @p N should return a randomly chosen integer from the + * range [0,N). + */ + template<typename _RandomAccessIterator, typename _RandomNumberGenerator> + void + random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last, + _RandomNumberGenerator& __rand) + { + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return; + for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) + std::iter_swap(__i, __first + __rand((__i - __first) + 1)); + } + + + /** + * @brief Move elements for which a predicate is true to the beginning + * of a sequence. + * @ingroup mutating_algorithms + * @param first A forward iterator. + * @param last A forward iterator. + * @param pred A predicate functor. + * @return An iterator @p middle such that @p pred(i) is true for each + * iterator @p i in the range @p [first,middle) and false for each @p i + * in the range @p [middle,last). + * + * @p pred must not modify its operand. @p partition() does not preserve + * the relative ordering of elements in each group, use + * @p stable_partition() if this is needed. + */ + template<typename _ForwardIterator, typename _Predicate> + inline _ForwardIterator + partition(_ForwardIterator __first, _ForwardIterator __last, + _Predicate __pred) + { + // concept requirements + __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< + _ForwardIterator>) + __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + return std::__partition(__first, __last, __pred, + std::__iterator_category(__first)); + } + + + + /** + * @brief Sort the smallest elements of a sequence. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param middle Another iterator. + * @param last Another iterator. + * @return Nothing. + * + * Sorts the smallest @p (middle-first) elements in the range + * @p [first,last) and moves them to the range @p [first,middle). The + * order of the remaining elements in the range @p [middle,last) is + * undefined. + * After the sort if @p i and @j are iterators in the range + * @p [first,middle) such that @i precedes @j and @k is an iterator in + * the range @p [middle,last) then @p *j<*i and @p *k<*i are both false. + */ + template<typename _RandomAccessIterator> + inline void + partial_sort(_RandomAccessIterator __first, + _RandomAccessIterator __middle, + _RandomAccessIterator __last) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>) + __glibcxx_requires_valid_range(__first, __middle); + __glibcxx_requires_valid_range(__middle, __last); + + std::__heap_select(__first, __middle, __last); + std::sort_heap(__first, __middle); + } + + /** + * @brief Sort the smallest elements of a sequence using a predicate + * for comparison. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param middle Another iterator. + * @param last Another iterator. + * @param comp A comparison functor. + * @return Nothing. + * + * Sorts the smallest @p (middle-first) elements in the range + * @p [first,last) and moves them to the range @p [first,middle). The + * order of the remaining elements in the range @p [middle,last) is + * undefined. + * After the sort if @p i and @j are iterators in the range + * @p [first,middle) such that @i precedes @j and @k is an iterator in + * the range @p [middle,last) then @p *comp(j,*i) and @p comp(*k,*i) + * are both false. + */ + template<typename _RandomAccessIterator, typename _Compare> + inline void + partial_sort(_RandomAccessIterator __first, + _RandomAccessIterator __middle, + _RandomAccessIterator __last, + _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType, _ValueType>) + __glibcxx_requires_valid_range(__first, __middle); + __glibcxx_requires_valid_range(__middle, __last); + + std::__heap_select(__first, __middle, __last, __CheckedCompare(__comp)); + std::sort_heap(__first, __middle, __CheckedCompare(__comp)); + } + + /** + * @brief Sort a sequence just enough to find a particular position. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param nth Another iterator. + * @param last Another iterator. + * @return Nothing. + * + * Rearranges the elements in the range @p [first,last) so that @p *nth + * is the same element that would have been in that position had the + * whole sequence been sorted. + * whole sequence been sorted. The elements either side of @p *nth are + * not completely sorted, but for any iterator @i in the range + * @p [first,nth) and any iterator @j in the range @p [nth,last) it + * holds that @p *j<*i is false. + */ + template<typename _RandomAccessIterator> + inline void + nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, + _RandomAccessIterator __last) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>) + __glibcxx_requires_valid_range(__first, __nth); + __glibcxx_requires_valid_range(__nth, __last); + + if (__first == __last || __nth == __last) + return; + + std::__introselect(__first, __nth, __last, + std::__lg(__last - __first) * 2); + } + + /** + * @brief Sort a sequence just enough to find a particular position + * using a predicate for comparison. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param nth Another iterator. + * @param last Another iterator. + * @param comp A comparison functor. + * @return Nothing. + * + * Rearranges the elements in the range @p [first,last) so that @p *nth + * is the same element that would have been in that position had the + * whole sequence been sorted. The elements either side of @p *nth are + * not completely sorted, but for any iterator @i in the range + * @p [first,nth) and any iterator @j in the range @p [nth,last) it + * holds that @p comp(*j,*i) is false. + */ + template<typename _RandomAccessIterator, typename _Compare> + inline void + nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, + _RandomAccessIterator __last, _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType, _ValueType>) + __glibcxx_requires_valid_range(__first, __nth); + __glibcxx_requires_valid_range(__nth, __last); + + if (__first == __last || __nth == __last) + return; + + std::__introselect(__first, __nth, __last, + std::__lg(__last - __first) * 2, + __CheckedCompare(__comp)); + } + + + /** + * @brief Sort the elements of a sequence. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @return Nothing. + * + * Sorts the elements in the range @p [first,last) in ascending order, + * such that @p *(i+1)<*i is false for each iterator @p i in the range + * @p [first,last-1). + * + * The relative ordering of equivalent elements is not preserved, use + * @p stable_sort() if this is needed. + */ + template<typename _RandomAccessIterator> + inline void + sort(_RandomAccessIterator __first, _RandomAccessIterator __last) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first != __last) + { + std::__introsort_loop(__first, __last, + std::__lg(__last - __first) * 2); + std::__final_insertion_sort(__first, __last); + } + } + + /** + * @brief Sort the elements of a sequence using a predicate for comparison. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param comp A comparison functor. + * @return Nothing. + * + * Sorts the elements in the range @p [first,last) in ascending order, + * such that @p comp(*(i+1),*i) is false for every iterator @p i in the + * range @p [first,last-1). + * + * The relative ordering of equivalent elements is not preserved, use + * @p stable_sort() if this is needed. + */ + template<typename _RandomAccessIterator, typename _Compare> + inline void + sort(_RandomAccessIterator __first, _RandomAccessIterator __last, + _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType, + _ValueType>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first != __last) + { + std::__introsort_loop(__first, __last, + std::__lg(__last - __first) * 2, + __CheckedCompare(__comp)); + std::__final_insertion_sort(__first, __last, + __CheckedCompare(__comp)); + } + } + + /** + * @brief Merges two sorted ranges. + * @ingroup sorting_algorithms + * @param first1 An iterator. + * @param first2 Another iterator. + * @param last1 Another iterator. + * @param last2 Another iterator. + * @param result An iterator pointing to the end of the merged range. + * @return An iterator pointing to the first element "not less + * than" @a val. + * + * Merges the ranges [first1,last1) and [first2,last2) into the sorted range + * [result, result + (last1-first1) + (last2-first2)). Both input ranges + * must be sorted, and the output range must not overlap with either of + * the input ranges. The sort is @e stable, that is, for equivalent + * elements in the two ranges, elements from the first range will always + * come before elements from the second. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator> + _OutputIterator + merge(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set(__first1, __last1, __first2); + __glibcxx_requires_sorted_set(__first2, __last2, __first1); + + while (__first1 != __last1 && __first2 != __last2) + { + if (*__first2 < *__first1) + { + *__result = *__first2; + ++__first2; + } + else + { + *__result = *__first1; + ++__first1; + } + ++__result; + } + return std::copy(__first2, __last2, std::copy(__first1, __last1, + __result)); + } + + /** + * @brief Merges two sorted ranges. + * @ingroup sorting_algorithms + * @param first1 An iterator. + * @param first2 Another iterator. + * @param last1 Another iterator. + * @param last2 Another iterator. + * @param result An iterator pointing to the end of the merged range. + * @param comp A functor to use for comparisons. + * @return An iterator pointing to the first element "not less + * than" @a val. + * + * Merges the ranges [first1,last1) and [first2,last2) into the sorted range + * [result, result + (last1-first1) + (last2-first2)). Both input ranges + * must be sorted, and the output range must not overlap with either of + * the input ranges. The sort is @e stable, that is, for equivalent + * elements in the two ranges, elements from the first range will always + * come before elements from the second. + * + * The comparison function should have the same effects on ordering as + * the function used for the initial sort. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator, typename _Compare> + _OutputIterator + merge(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result, _Compare __comp) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); + __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); + + while (__first1 != __last1 && __first2 != __last2) + { + if (__CheckedCompare(__comp)(*__first2, *__first1)) + { + *__result = *__first2; + ++__first2; + } + else + { + *__result = *__first1; + ++__first1; + } + ++__result; + } + return std::copy(__first2, __last2, std::copy(__first1, __last1, + __result)); + } + + + /** + * @brief Sort the elements of a sequence, preserving the relative order + * of equivalent elements. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @return Nothing. + * + * Sorts the elements in the range @p [first,last) in ascending order, + * such that @p *(i+1)<*i is false for each iterator @p i in the range + * @p [first,last-1). + * + * The relative ordering of equivalent elements is preserved, so any two + * elements @p x and @p y in the range @p [first,last) such that + * @p x<y is false and @p y<x is false will have the same relative + * ordering after calling @p stable_sort(). + */ + template<typename _RandomAccessIterator> + inline void + stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>) + __glibcxx_requires_valid_range(__first, __last); + + _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first, + __last); + if (__buf.begin() == 0) + std::__inplace_stable_sort(__first, __last); + else + std::__stable_sort_adaptive(__first, __last, __buf.begin(), + _DistanceType(__buf.size())); + } + + /** + * @brief Sort the elements of a sequence using a predicate for comparison, + * preserving the relative order of equivalent elements. + * @ingroup sorting_algorithms + * @param first An iterator. + * @param last Another iterator. + * @param comp A comparison functor. + * @return Nothing. + * + * Sorts the elements in the range @p [first,last) in ascending order, + * such that @p comp(*(i+1),*i) is false for each iterator @p i in the + * range @p [first,last-1). + * + * The relative ordering of equivalent elements is preserved, so any two + * elements @p x and @p y in the range @p [first,last) such that + * @p comp(x,y) is false and @p comp(y,x) is false will have the same + * relative ordering after calling @p stable_sort(). + */ + template<typename _RandomAccessIterator, typename _Compare> + inline void + stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last, + _Compare __comp) + { + typedef typename iterator_traits<_RandomAccessIterator>::value_type + _ValueType; + typedef typename iterator_traits<_RandomAccessIterator>::difference_type + _DistanceType; + + // concept requirements + __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< + _RandomAccessIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType, + _ValueType>) + __glibcxx_requires_valid_range(__first, __last); + + _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first, + __last); + if (__buf.begin() == 0) + std::__inplace_stable_sort(__first, __last, __CheckedCompare(__comp)); + else + std::__stable_sort_adaptive(__first, __last, __buf.begin(), + _DistanceType(__buf.size()), + __CheckedCompare(__comp)); + } + + + /** + * @brief Return the union of two sorted ranges. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * each range in order to the output range. Iterators increment for each + * range. When the current element of one range is less than the other, + * that element is copied and the iterator advanced. If an element is + * contained in both ranges, the element from the first range is copied and + * both ranges advance. The output range may not overlap either input + * range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator> + _OutputIterator + set_union(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set(__first1, __last1, __first2); + __glibcxx_requires_sorted_set(__first2, __last2, __first1); + + while (__first1 != __last1 && __first2 != __last2) + { + if (*__first1 < *__first2) + { + *__result = *__first1; + ++__first1; + } + else if (*__first2 < *__first1) + { + *__result = *__first2; + ++__first2; + } + else + { + *__result = *__first1; + ++__first1; + ++__first2; + } + ++__result; + } + return std::copy(__first2, __last2, std::copy(__first1, __last1, + __result)); + } + + /** + * @brief Return the union of two sorted ranges using a comparison functor. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @param comp The comparison functor. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * each range in order to the output range. Iterators increment for each + * range. When the current element of one range is less than the other + * according to @a comp, that element is copied and the iterator advanced. + * If an equivalent element according to @a comp is contained in both + * ranges, the element from the first range is copied and both ranges + * advance. The output range may not overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator, typename _Compare> + _OutputIterator + set_union(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result, _Compare __comp) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType1, _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); + __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); + + while (__first1 != __last1 && __first2 != __last2) + { + if (__CheckedCompare(__comp)(*__first1, *__first2)) + { + *__result = *__first1; + ++__first1; + } + else if (__CheckedCompare(__comp)(*__first2, *__first1)) + { + *__result = *__first2; + ++__first2; + } + else + { + *__result = *__first1; + ++__first1; + ++__first2; + } + ++__result; + } + return std::copy(__first2, __last2, std::copy(__first1, __last1, + __result)); + } + + /** + * @brief Return the intersection of two sorted ranges. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * both ranges in order to the output range. Iterators increment for each + * range. When the current element of one range is less than the other, + * that iterator advances. If an element is contained in both ranges, the + * element from the first range is copied and both ranges advance. The + * output range may not overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator> + _OutputIterator + set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set(__first1, __last1, __first2); + __glibcxx_requires_sorted_set(__first2, __last2, __first1); + + while (__first1 != __last1 && __first2 != __last2) + if (*__first1 < *__first2) + ++__first1; + else if (*__first2 < *__first1) + ++__first2; + else + { + *__result = *__first1; + ++__first1; + ++__first2; + ++__result; + } + return __result; + } + + /** + * @brief Return the intersection of two sorted ranges using comparison + * functor. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @param comp The comparison functor. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * both ranges in order to the output range. Iterators increment for each + * range. When the current element of one range is less than the other + * according to @a comp, that iterator advances. If an element is + * contained in both ranges according to @a comp, the element from the + * first range is copied and both ranges advance. The output range may not + * overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator, typename _Compare> + _OutputIterator + set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result, _Compare __comp) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType1, _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); + __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); + + while (__first1 != __last1 && __first2 != __last2) + if (__CheckedCompare(__comp)(*__first1, *__first2)) + ++__first1; + else if (__CheckedCompare(__comp)(*__first2, *__first1)) + ++__first2; + else + { + *__result = *__first1; + ++__first1; + ++__first2; + ++__result; + } + return __result; + } + + /** + * @brief Return the difference of two sorted ranges. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * the first range but not the second in order to the output range. + * Iterators increment for each range. When the current element of the + * first range is less than the second, that element is copied and the + * iterator advances. If the current element of the second range is less, + * the iterator advances, but no element is copied. If an element is + * contained in both ranges, no elements are copied and both ranges + * advance. The output range may not overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator> + _OutputIterator + set_difference(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set(__first1, __last1, __first2); + __glibcxx_requires_sorted_set(__first2, __last2, __first1); + + while (__first1 != __last1 && __first2 != __last2) + if (*__first1 < *__first2) + { + *__result = *__first1; + ++__first1; + ++__result; + } + else if (*__first2 < *__first1) + ++__first2; + else + { + ++__first1; + ++__first2; + } + return std::copy(__first1, __last1, __result); + } + + /** + * @brief Return the difference of two sorted ranges using comparison + * functor. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @param comp The comparison functor. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * the first range but not the second in order to the output range. + * Iterators increment for each range. When the current element of the + * first range is less than the second according to @a comp, that element + * is copied and the iterator advances. If the current element of the + * second range is less, no element is copied and the iterator advances. + * If an element is contained in both ranges according to @a comp, no + * elements are copied and both ranges advance. The output range may not + * overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator, typename _Compare> + _OutputIterator + set_difference(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result, _Compare __comp) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType1, _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); + __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); + + while (__first1 != __last1 && __first2 != __last2) + if (__CheckedCompare(__comp)(*__first1, *__first2)) + { + *__result = *__first1; + ++__first1; + ++__result; + } + else if (__CheckedCompare(__comp)(*__first2, *__first1)) + ++__first2; + else + { + ++__first1; + ++__first2; + } + return std::copy(__first1, __last1, __result); + } + + /** + * @brief Return the symmetric difference of two sorted ranges. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * one range but not the other in order to the output range. Iterators + * increment for each range. When the current element of one range is less + * than the other, that element is copied and the iterator advances. If an + * element is contained in both ranges, no elements are copied and both + * ranges advance. The output range may not overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator> + _OutputIterator + set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>) + __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set(__first1, __last1, __first2); + __glibcxx_requires_sorted_set(__first2, __last2, __first1); + + while (__first1 != __last1 && __first2 != __last2) + if (*__first1 < *__first2) + { + *__result = *__first1; + ++__first1; + ++__result; + } + else if (*__first2 < *__first1) + { + *__result = *__first2; + ++__first2; + ++__result; + } + else + { + ++__first1; + ++__first2; + } + return std::copy(__first2, __last2, std::copy(__first1, + __last1, __result)); + } + + /** + * @brief Return the symmetric difference of two sorted ranges using + * comparison functor. + * @ingroup set_algorithms + * @param first1 Start of first range. + * @param last1 End of first range. + * @param first2 Start of second range. + * @param last2 End of second range. + * @param comp The comparison functor. + * @return End of the output range. + * @ingroup set_algorithms + * + * This operation iterates over both ranges, copying elements present in + * one range but not the other in order to the output range. Iterators + * increment for each range. When the current element of one range is less + * than the other according to @a comp, that element is copied and the + * iterator advances. If an element is contained in both ranges according + * to @a comp, no elements are copied and both ranges advance. The output + * range may not overlap either input range. + */ + template<typename _InputIterator1, typename _InputIterator2, + typename _OutputIterator, typename _Compare> + _OutputIterator + set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1, + _InputIterator2 __first2, _InputIterator2 __last2, + _OutputIterator __result, + _Compare __comp) + { + typedef typename iterator_traits<_InputIterator1>::value_type + _ValueType1; + typedef typename iterator_traits<_InputIterator2>::value_type + _ValueType2; + + // concept requirements + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) + __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType1>) + __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, + _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType1, _ValueType2>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + _ValueType2, _ValueType1>) + __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); + __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); + + while (__first1 != __last1 && __first2 != __last2) + if (__CheckedCompare(__comp)(*__first1, *__first2)) + { + *__result = *__first1; + ++__first1; + ++__result; + } + else if (__CheckedCompare(__comp)(*__first2, *__first1)) + { + *__result = *__first2; + ++__first2; + ++__result; + } + else + { + ++__first1; + ++__first2; + } + return std::copy(__first2, __last2, + std::copy(__first1, __last1, __result)); + } + + + /** + * @brief Return the minimum element in a range. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @return Iterator referencing the first instance of the smallest value. + */ + template<typename _ForwardIterator> + _ForwardIterator + min_element(_ForwardIterator __first, _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanComparableConcept< + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __first; + _ForwardIterator __result = __first; + while (++__first != __last) + if (*__first < *__result) + __result = __first; + return __result; + } + + /** + * @brief Return the minimum element in a range using comparison functor. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @param comp Comparison functor. + * @return Iterator referencing the first instance of the smallest value + * according to comp. + */ + template<typename _ForwardIterator, typename _Compare> + _ForwardIterator + min_element(_ForwardIterator __first, _ForwardIterator __last, + _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __first; + _ForwardIterator __result = __first; + while (++__first != __last) + if (__CheckedCompare(__comp)(*__first, *__result)) + __result = __first; + return __result; + } + + /** + * @brief Return the maximum element in a range. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @return Iterator referencing the first instance of the largest value. + */ + template<typename _ForwardIterator> + _ForwardIterator + max_element(_ForwardIterator __first, _ForwardIterator __last) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_LessThanComparableConcept< + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) + return __first; + _ForwardIterator __result = __first; + while (++__first != __last) + if (*__result < *__first) + __result = __first; + return __result; + } + + /** + * @brief Return the maximum element in a range using comparison functor. + * @ingroup sorting_algorithms + * @param first Start of range. + * @param last End of range. + * @param comp Comparison functor. + * @return Iterator referencing the first instance of the largest value + * according to comp. + */ + template<typename _ForwardIterator, typename _Compare> + _ForwardIterator + max_element(_ForwardIterator __first, _ForwardIterator __last, + _Compare __comp) + { + // concept requirements + __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) + __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, + typename iterator_traits<_ForwardIterator>::value_type, + typename iterator_traits<_ForwardIterator>::value_type>) + __glibcxx_requires_valid_range(__first, __last); + + if (__first == __last) return __first; + _ForwardIterator __result = __first; + while (++__first != __last) + if (__CheckedCompare(__comp)(*__result, *__first)) + __result = __first; + return __result; + } + +#undef __CheckedCompare + +_GLIBCXX_END_NESTED_NAMESPACE + +#endif /* _STL_ALGO_H */ |