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+// The template and inlines for the -*- C++ -*- indirect_array class.
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 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/>.
+
+/** @file indirect_array.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>
+
+#ifndef _INDIRECT_ARRAY_H
+#define _INDIRECT_ARRAY_H 1
+
+#pragma GCC system_header
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ /**
+ * @addtogroup numeric_arrays
+ * @{
+ */
+
+ /**
+ * @brief Reference to arbitrary subset of an array.
+ *
+ * An indirect_array is a reference to the actual elements of an array
+ * specified by an ordered array of indices. The way to get an
+ * indirect_array is to call operator[](valarray<size_t>) on a valarray.
+ * The returned indirect_array then permits carrying operations out on the
+ * referenced subset of elements in the original valarray.
+ *
+ * For example, if an indirect_array is obtained using the array (4,2,0) as
+ * an argument, and then assigned to an array containing (1,2,3), then the
+ * underlying array will have array[0]==3, array[2]==2, and array[4]==1.
+ *
+ * @param Tp Element type.
+ */
+ template <class _Tp>
+ class indirect_array
+ {
+ public:
+ typedef _Tp value_type;
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 253. valarray helper functions are almost entirely useless
+
+ /// Copy constructor. Both slices refer to the same underlying array.
+ indirect_array(const indirect_array&);
+
+ /// Assignment operator. Assigns elements to corresponding elements
+ /// of @a a.
+ indirect_array& operator=(const indirect_array&);
+
+ /// Assign slice elements to corresponding elements of @a v.
+ void operator=(const valarray<_Tp>&) const;
+ /// Multiply slice elements by corresponding elements of @a v.
+ void operator*=(const valarray<_Tp>&) const;
+ /// Divide slice elements by corresponding elements of @a v.
+ void operator/=(const valarray<_Tp>&) const;
+ /// Modulo slice elements by corresponding elements of @a v.
+ void operator%=(const valarray<_Tp>&) const;
+ /// Add corresponding elements of @a v to slice elements.
+ void operator+=(const valarray<_Tp>&) const;
+ /// Subtract corresponding elements of @a v from slice elements.
+ void operator-=(const valarray<_Tp>&) const;
+ /// Logical xor slice elements with corresponding elements of @a v.
+ void operator^=(const valarray<_Tp>&) const;
+ /// Logical and slice elements with corresponding elements of @a v.
+ void operator&=(const valarray<_Tp>&) const;
+ /// Logical or slice elements with corresponding elements of @a v.
+ void operator|=(const valarray<_Tp>&) const;
+ /// Left shift slice elements by corresponding elements of @a v.
+ void operator<<=(const valarray<_Tp>&) const;
+ /// Right shift slice elements by corresponding elements of @a v.
+ void operator>>=(const valarray<_Tp>&) const;
+ /// Assign all slice elements to @a t.
+ void operator= (const _Tp&) const;
+ // ~indirect_array();
+
+ template<class _Dom>
+ void operator=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator*=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator/=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator%=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator+=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator-=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator^=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator&=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator|=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator<<=(const _Expr<_Dom, _Tp>&) const;
+ template<class _Dom>
+ void operator>>=(const _Expr<_Dom, _Tp>&) const;
+
+ private:
+ /// Copy constructor. Both slices refer to the same underlying array.
+ indirect_array(_Array<_Tp>, size_t, _Array<size_t>);
+
+ friend class valarray<_Tp>;
+ friend class gslice_array<_Tp>;
+
+ const size_t _M_sz;
+ const _Array<size_t> _M_index;
+ const _Array<_Tp> _M_array;
+
+ // not implemented
+ indirect_array();
+ };
+
+ template<typename _Tp>
+ inline
+ indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a)
+ : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {}
+
+ template<typename _Tp>
+ inline
+ indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s,
+ _Array<size_t> __i)
+ : _M_sz(__s), _M_index(__i), _M_array(__a) {}
+
+ template<typename _Tp>
+ inline indirect_array<_Tp>&
+ indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a)
+ {
+ std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array,
+ _M_index);
+ return *this;
+ }
+
+ template<typename _Tp>
+ inline void
+ indirect_array<_Tp>::operator=(const _Tp& __t) const
+ { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); }
+
+ template<typename _Tp>
+ inline void
+ indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const
+ { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); }
+
+ template<typename _Tp>
+ template<class _Dom>
+ inline void
+ indirect_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const
+ { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); }
+
+#undef _DEFINE_VALARRAY_OPERATOR
+#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \
+ template<typename _Tp> \
+ inline void \
+ indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\
+ { \
+ _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \
+ } \
+ \
+ template<typename _Tp> \
+ template<class _Dom> \
+ inline void \
+ indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\
+ { \
+ _Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz); \
+ }
+
+_DEFINE_VALARRAY_OPERATOR(*, __multiplies)
+_DEFINE_VALARRAY_OPERATOR(/, __divides)
+_DEFINE_VALARRAY_OPERATOR(%, __modulus)
+_DEFINE_VALARRAY_OPERATOR(+, __plus)
+_DEFINE_VALARRAY_OPERATOR(-, __minus)
+_DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)
+_DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)
+_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
+_DEFINE_VALARRAY_OPERATOR(<<, __shift_left)
+_DEFINE_VALARRAY_OPERATOR(>>, __shift_right)
+
+#undef _DEFINE_VALARRAY_OPERATOR
+
+ // @} group numeric_arrays
+
+_GLIBCXX_END_NAMESPACE
+
+#endif /* _INDIRECT_ARRAY_H */
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