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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/backward/binders.h')
| -rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/backward/binders.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/backward/binders.h b/gcc-4.4.3/libstdc++-v3/include/backward/binders.h new file mode 100644 index 000000000..9b059cef1 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/backward/binders.h @@ -0,0 +1,168 @@ +// Functor implementations -*- C++ -*- + +// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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) 1996-1998 + * 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 backward/binders.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +#ifndef _GLIBCXX_BINDERS_H +#define _GLIBCXX_BINDERS_H 1 + +_GLIBCXX_BEGIN_NAMESPACE(std) + + // 20.3.6 binders + /** @defgroup binders Binder Classes + * @ingroup functors + * + * Binders turn functions/functors with two arguments into functors with + * a single argument, storing an argument to be applied later. For + * example, a variable @c B of type @c binder1st is constructed from a + * functor @c f and an argument @c x. Later, B's @c operator() is called + * with a single argument @c y. The return value is the value of @c f(x,y). + * @c B can be "called" with various arguments (y1, y2, ...) and will in + * turn call @c f(x,y1), @c f(x,y2), ... + * + * The function @c bind1st is provided to save some typing. It takes the + * function and an argument as parameters, and returns an instance of + * @c binder1st. + * + * The type @c binder2nd and its creator function @c bind2nd do the same + * thing, but the stored argument is passed as the second parameter instead + * of the first, e.g., @c bind2nd(std::minus<float>,1.3) will create a + * functor whose @c operator() accepts a floating-point number, subtracts + * 1.3 from it, and returns the result. (If @c bind1st had been used, + * the functor would perform "1.3 - x" instead. + * + * Creator-wrapper functions like @c bind1st are intended to be used in + * calling algorithms. Their return values will be temporary objects. + * (The goal is to not require you to type names like + * @c std::binder1st<std::plus<int>> for declaring a variable to hold the + * return value from @c bind1st(std::plus<int>,5). + * + * These become more useful when combined with the composition functions. + * + * @{ + */ + /// One of the @link binders binder functors@endlink. + template<typename _Operation> + class binder1st + : public unary_function<typename _Operation::second_argument_type, + typename _Operation::result_type> + { + protected: + _Operation op; + typename _Operation::first_argument_type value; + + public: + binder1st(const _Operation& __x, + const typename _Operation::first_argument_type& __y) + : op(__x), value(__y) { } + + typename _Operation::result_type + operator()(const typename _Operation::second_argument_type& __x) const + { return op(value, __x); } + + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 109. Missing binders for non-const sequence elements + typename _Operation::result_type + operator()(typename _Operation::second_argument_type& __x) const + { return op(value, __x); } + } _GLIBCXX_DEPRECATED_ATTR; + + /// One of the @link binders binder functors@endlink. + template<typename _Operation, typename _Tp> + inline binder1st<_Operation> + bind1st(const _Operation& __fn, const _Tp& __x) + { + typedef typename _Operation::first_argument_type _Arg1_type; + return binder1st<_Operation>(__fn, _Arg1_type(__x)); + } + + /// One of the @link binders binder functors@endlink. + template<typename _Operation> + class binder2nd + : public unary_function<typename _Operation::first_argument_type, + typename _Operation::result_type> + { + protected: + _Operation op; + typename _Operation::second_argument_type value; + + public: + binder2nd(const _Operation& __x, + const typename _Operation::second_argument_type& __y) + : op(__x), value(__y) { } + + typename _Operation::result_type + operator()(const typename _Operation::first_argument_type& __x) const + { return op(__x, value); } + + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 109. Missing binders for non-const sequence elements + typename _Operation::result_type + operator()(typename _Operation::first_argument_type& __x) const + { return op(__x, value); } + } _GLIBCXX_DEPRECATED_ATTR; + + /// One of the @link binders binder functors@endlink. + template<typename _Operation, typename _Tp> + inline binder2nd<_Operation> + bind2nd(const _Operation& __fn, const _Tp& __x) + { + typedef typename _Operation::second_argument_type _Arg2_type; + return binder2nd<_Operation>(__fn, _Arg2_type(__x)); + } + /** @} */ + +_GLIBCXX_END_NAMESPACE + +#endif /* _GLIBCXX_BINDERS_H */ |