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735 lines
22 KiB
C++
735 lines
22 KiB
C++
// Functor implementations -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bits/stl_function.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{functional}
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*/
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#ifndef _STL_FUNCTION_H
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#define _STL_FUNCTION_H 1
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 20.3.1 base classes
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/** @defgroup functors Function Objects
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* @ingroup utilities
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*
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* Function objects, or @e functors, are objects with an @c operator()
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* defined and accessible. They can be passed as arguments to algorithm
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* templates and used in place of a function pointer. Not only is the
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* resulting expressiveness of the library increased, but the generated
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* code can be more efficient than what you might write by hand. When we
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* refer to @a functors, then, generally we include function pointers in
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* the description as well.
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*
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* Often, functors are only created as temporaries passed to algorithm
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* calls, rather than being created as named variables.
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*
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* Two examples taken from the standard itself follow. To perform a
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* by-element addition of two vectors @c a and @c b containing @c double,
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* and put the result in @c a, use
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* \code
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* transform (a.begin(), a.end(), b.begin(), a.begin(), plus<double>());
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* \endcode
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* To negate every element in @c a, use
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* \code
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* transform(a.begin(), a.end(), a.begin(), negate<double>());
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* \endcode
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* The addition and negation functions will be inlined directly.
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*
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* The standard functors are derived from structs named @c unary_function
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* and @c binary_function. These two classes contain nothing but typedefs,
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* to aid in generic (template) programming. If you write your own
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* functors, you might consider doing the same.
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*
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* @{
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*/
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/**
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* This is one of the @link functors functor base classes@endlink.
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*/
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template<typename _Arg, typename _Result>
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struct unary_function
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{
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/// @c argument_type is the type of the argument
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typedef _Arg argument_type;
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/// @c result_type is the return type
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typedef _Result result_type;
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};
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/**
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* This is one of the @link functors functor base classes@endlink.
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*/
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template<typename _Arg1, typename _Arg2, typename _Result>
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struct binary_function
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{
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/// @c first_argument_type is the type of the first argument
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typedef _Arg1 first_argument_type;
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/// @c second_argument_type is the type of the second argument
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typedef _Arg2 second_argument_type;
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/// @c result_type is the return type
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typedef _Result result_type;
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};
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/** @} */
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// 20.3.2 arithmetic
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/** @defgroup arithmetic_functors Arithmetic Classes
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* @ingroup functors
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*
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* Because basic math often needs to be done during an algorithm,
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* the library provides functors for those operations. See the
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* documentation for @link functors the base classes@endlink
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* for examples of their use.
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*
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* @{
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*/
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct plus : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x + __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct minus : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x - __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct multiplies : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x * __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct divides : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x / __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct modulus : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x % __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct negate : public unary_function<_Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x) const
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{ return -__x; }
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};
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/** @} */
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// 20.3.3 comparisons
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/** @defgroup comparison_functors Comparison Classes
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* @ingroup functors
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*
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* The library provides six wrapper functors for all the basic comparisons
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* in C++, like @c <.
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*
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* @{
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*/
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct equal_to : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x == __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct not_equal_to : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x != __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct greater : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x > __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct less : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x < __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct greater_equal : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x >= __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct less_equal : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x <= __y; }
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};
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/** @} */
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// 20.3.4 logical operations
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/** @defgroup logical_functors Boolean Operations Classes
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* @ingroup functors
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*
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* Here are wrapper functors for Boolean operations: @c &&, @c ||,
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* and @c !.
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*
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* @{
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*/
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/// One of the @link logical_functors Boolean operations functors@endlink.
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template<typename _Tp>
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struct logical_and : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x && __y; }
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};
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/// One of the @link logical_functors Boolean operations functors@endlink.
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template<typename _Tp>
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struct logical_or : public binary_function<_Tp, _Tp, bool>
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{
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x || __y; }
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};
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/// One of the @link logical_functors Boolean operations functors@endlink.
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template<typename _Tp>
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struct logical_not : public unary_function<_Tp, bool>
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{
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bool
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operator()(const _Tp& __x) const
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{ return !__x; }
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};
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/** @} */
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 660. Missing Bitwise Operations.
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template<typename _Tp>
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struct bit_and : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x & __y; }
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};
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template<typename _Tp>
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struct bit_or : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x | __y; }
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};
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template<typename _Tp>
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struct bit_xor : public binary_function<_Tp, _Tp, _Tp>
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{
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x ^ __y; }
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};
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// 20.3.5 negators
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/** @defgroup negators Negators
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* @ingroup functors
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*
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* The functions @c not1 and @c not2 each take a predicate functor
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* and return an instance of @c unary_negate or
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* @c binary_negate, respectively. These classes are functors whose
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* @c operator() performs the stored predicate function and then returns
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* the negation of the result.
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*
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* For example, given a vector of integers and a trivial predicate,
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* \code
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* struct IntGreaterThanThree
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* : public std::unary_function<int, bool>
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* {
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* bool operator() (int x) { return x > 3; }
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* };
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*
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* std::find_if (v.begin(), v.end(), not1(IntGreaterThanThree()));
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* \endcode
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* The call to @c find_if will locate the first index (i) of @c v for which
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* <code>!(v[i] > 3)</code> is true.
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*
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* The not1/unary_negate combination works on predicates taking a single
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* argument. The not2/binary_negate combination works on predicates which
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* take two arguments.
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*
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* @{
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*/
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/// One of the @link negators negation functors@endlink.
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template<typename _Predicate>
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class unary_negate
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: public unary_function<typename _Predicate::argument_type, bool>
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{
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protected:
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_Predicate _M_pred;
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public:
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explicit
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unary_negate(const _Predicate& __x) : _M_pred(__x) { }
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bool
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operator()(const typename _Predicate::argument_type& __x) const
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{ return !_M_pred(__x); }
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};
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/// One of the @link negators negation functors@endlink.
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template<typename _Predicate>
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inline unary_negate<_Predicate>
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not1(const _Predicate& __pred)
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{ return unary_negate<_Predicate>(__pred); }
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/// One of the @link negators negation functors@endlink.
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template<typename _Predicate>
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class binary_negate
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: public binary_function<typename _Predicate::first_argument_type,
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typename _Predicate::second_argument_type, bool>
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{
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protected:
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_Predicate _M_pred;
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public:
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explicit
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binary_negate(const _Predicate& __x) : _M_pred(__x) { }
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bool
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operator()(const typename _Predicate::first_argument_type& __x,
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const typename _Predicate::second_argument_type& __y) const
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{ return !_M_pred(__x, __y); }
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};
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/// One of the @link negators negation functors@endlink.
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template<typename _Predicate>
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inline binary_negate<_Predicate>
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not2(const _Predicate& __pred)
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{ return binary_negate<_Predicate>(__pred); }
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/** @} */
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// 20.3.7 adaptors pointers functions
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/** @defgroup pointer_adaptors Adaptors for pointers to functions
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* @ingroup functors
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*
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* The advantage of function objects over pointers to functions is that
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* the objects in the standard library declare nested typedefs describing
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* their argument and result types with uniform names (e.g., @c result_type
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* from the base classes @c unary_function and @c binary_function).
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* Sometimes those typedefs are required, not just optional.
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*
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* Adaptors are provided to turn pointers to unary (single-argument) and
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* binary (double-argument) functions into function objects. The
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* long-winded functor @c pointer_to_unary_function is constructed with a
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* function pointer @c f, and its @c operator() called with argument @c x
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* returns @c f(x). The functor @c pointer_to_binary_function does the same
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* thing, but with a double-argument @c f and @c operator().
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*
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* The function @c ptr_fun takes a pointer-to-function @c f and constructs
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* an instance of the appropriate functor.
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*
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* @{
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*/
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/// One of the @link pointer_adaptors adaptors for function pointers@endlink.
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template<typename _Arg, typename _Result>
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class pointer_to_unary_function : public unary_function<_Arg, _Result>
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{
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protected:
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_Result (*_M_ptr)(_Arg);
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public:
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pointer_to_unary_function() { }
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explicit
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pointer_to_unary_function(_Result (*__x)(_Arg))
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: _M_ptr(__x) { }
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_Result
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operator()(_Arg __x) const
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{ return _M_ptr(__x); }
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};
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/// One of the @link pointer_adaptors adaptors for function pointers@endlink.
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template<typename _Arg, typename _Result>
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inline pointer_to_unary_function<_Arg, _Result>
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ptr_fun(_Result (*__x)(_Arg))
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{ return pointer_to_unary_function<_Arg, _Result>(__x); }
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/// One of the @link pointer_adaptors adaptors for function pointers@endlink.
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template<typename _Arg1, typename _Arg2, typename _Result>
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class pointer_to_binary_function
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: public binary_function<_Arg1, _Arg2, _Result>
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{
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protected:
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_Result (*_M_ptr)(_Arg1, _Arg2);
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public:
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pointer_to_binary_function() { }
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explicit
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pointer_to_binary_function(_Result (*__x)(_Arg1, _Arg2))
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: _M_ptr(__x) { }
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_Result
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operator()(_Arg1 __x, _Arg2 __y) const
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{ return _M_ptr(__x, __y); }
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};
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/// One of the @link pointer_adaptors adaptors for function pointers@endlink.
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template<typename _Arg1, typename _Arg2, typename _Result>
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inline pointer_to_binary_function<_Arg1, _Arg2, _Result>
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ptr_fun(_Result (*__x)(_Arg1, _Arg2))
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{ return pointer_to_binary_function<_Arg1, _Arg2, _Result>(__x); }
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/** @} */
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template<typename _Tp>
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struct _Identity : public unary_function<_Tp,_Tp>
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{
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_Tp&
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operator()(_Tp& __x) const
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{ return __x; }
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const _Tp&
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operator()(const _Tp& __x) const
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{ return __x; }
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};
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template<typename _Pair>
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struct _Select1st : public unary_function<_Pair,
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typename _Pair::first_type>
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{
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typename _Pair::first_type&
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operator()(_Pair& __x) const
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{ return __x.first; }
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const typename _Pair::first_type&
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operator()(const _Pair& __x) const
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{ return __x.first; }
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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template<typename _Pair2>
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typename _Pair2::first_type&
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operator()(_Pair2& __x) const
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{ return __x.first; }
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template<typename _Pair2>
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const typename _Pair2::first_type&
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operator()(const _Pair2& __x) const
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{ return __x.first; }
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#endif
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};
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template<typename _Pair>
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struct _Select2nd : public unary_function<_Pair,
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typename _Pair::second_type>
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{
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typename _Pair::second_type&
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operator()(_Pair& __x) const
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{ return __x.second; }
|
|
|
|
const typename _Pair::second_type&
|
|
operator()(const _Pair& __x) const
|
|
{ return __x.second; }
|
|
};
|
|
|
|
// 20.3.8 adaptors pointers members
|
|
/** @defgroup memory_adaptors Adaptors for pointers to members
|
|
* @ingroup functors
|
|
*
|
|
* There are a total of 8 = 2^3 function objects in this family.
|
|
* (1) Member functions taking no arguments vs member functions taking
|
|
* one argument.
|
|
* (2) Call through pointer vs call through reference.
|
|
* (3) Const vs non-const member function.
|
|
*
|
|
* All of this complexity is in the function objects themselves. You can
|
|
* ignore it by using the helper function mem_fun and mem_fun_ref,
|
|
* which create whichever type of adaptor is appropriate.
|
|
*
|
|
* @{
|
|
*/
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp>
|
|
class mem_fun_t : public unary_function<_Tp*, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
mem_fun_t(_Ret (_Tp::*__pf)())
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(_Tp* __p) const
|
|
{ return (__p->*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)();
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp>
|
|
class const_mem_fun_t : public unary_function<const _Tp*, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
const_mem_fun_t(_Ret (_Tp::*__pf)() const)
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp* __p) const
|
|
{ return (__p->*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)() const;
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp>
|
|
class mem_fun_ref_t : public unary_function<_Tp, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
mem_fun_ref_t(_Ret (_Tp::*__pf)())
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(_Tp& __r) const
|
|
{ return (__r.*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)();
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp>
|
|
class const_mem_fun_ref_t : public unary_function<_Tp, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
const_mem_fun_ref_t(_Ret (_Tp::*__pf)() const)
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp& __r) const
|
|
{ return (__r.*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)() const;
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
class mem_fun1_t : public binary_function<_Tp*, _Arg, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
mem_fun1_t(_Ret (_Tp::*__pf)(_Arg))
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(_Tp* __p, _Arg __x) const
|
|
{ return (__p->*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_Arg);
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
class const_mem_fun1_t : public binary_function<const _Tp*, _Arg, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
const_mem_fun1_t(_Ret (_Tp::*__pf)(_Arg) const)
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp* __p, _Arg __x) const
|
|
{ return (__p->*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_Arg) const;
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
class mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg))
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(_Tp& __r, _Arg __x) const
|
|
{ return (__r.*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_Arg);
|
|
};
|
|
|
|
/// One of the @link memory_adaptors adaptors for member
|
|
/// pointers@endlink.
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
class const_mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
|
|
{
|
|
public:
|
|
explicit
|
|
const_mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg) const)
|
|
: _M_f(__pf) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp& __r, _Arg __x) const
|
|
{ return (__r.*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_Arg) const;
|
|
};
|
|
|
|
// Mem_fun adaptor helper functions. There are only two:
|
|
// mem_fun and mem_fun_ref.
|
|
template<typename _Ret, typename _Tp>
|
|
inline mem_fun_t<_Ret, _Tp>
|
|
mem_fun(_Ret (_Tp::*__f)())
|
|
{ return mem_fun_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp>
|
|
inline const_mem_fun_t<_Ret, _Tp>
|
|
mem_fun(_Ret (_Tp::*__f)() const)
|
|
{ return const_mem_fun_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp>
|
|
inline mem_fun_ref_t<_Ret, _Tp>
|
|
mem_fun_ref(_Ret (_Tp::*__f)())
|
|
{ return mem_fun_ref_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp>
|
|
inline const_mem_fun_ref_t<_Ret, _Tp>
|
|
mem_fun_ref(_Ret (_Tp::*__f)() const)
|
|
{ return const_mem_fun_ref_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
inline mem_fun1_t<_Ret, _Tp, _Arg>
|
|
mem_fun(_Ret (_Tp::*__f)(_Arg))
|
|
{ return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
inline const_mem_fun1_t<_Ret, _Tp, _Arg>
|
|
mem_fun(_Ret (_Tp::*__f)(_Arg) const)
|
|
{ return const_mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
inline mem_fun1_ref_t<_Ret, _Tp, _Arg>
|
|
mem_fun_ref(_Ret (_Tp::*__f)(_Arg))
|
|
{ return mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
inline const_mem_fun1_ref_t<_Ret, _Tp, _Arg>
|
|
mem_fun_ref(_Ret (_Tp::*__f)(_Arg) const)
|
|
{ return const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
|
|
|
|
/** @} */
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#if !defined(__GXX_EXPERIMENTAL_CXX0X__) || _GLIBCXX_USE_DEPRECATED
|
|
# include <backward/binders.h>
|
|
#endif
|
|
|
|
#endif /* _STL_FUNCTION_H */
|