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Edit File : binders.h \| Size : 7.00 KB
// Functor implementations -- C++ -- // Copyright (C) 2001-2018 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. * Do not attempt to use it directly. @headername{functional} / #ifndef _BACKWARD_BINDERS_H #define _BACKWARD_BINDERS_H 1 // Suppress deprecated warning for this file. #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated-declarations" namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // 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 @a 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 <em>1.3 - x</em> 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. * * These functions are deprecated in C++11 and can be replaced by * @c std::bind (or @c std::tr1::bind) which is more powerful and flexible, * supporting functions with any number of arguments. Uses of @c bind1st * can be replaced by @c std::bind(f, x, std::placeholders::_1) and * @c bind2nd by @c std::bind(f, std::placeholders::_1, x). * @{ / /// 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; /// 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; /// 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_VERSION } // namespace #pragma GCC diagnostic pop #endif / _BACKWARD_BINDERS_H */ Back

Edit File : binders.h | Size : 7.00 KB

// Functor implementations -*- C++ -*-

// Copyright (C) 2001-2018 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.
 *  Do not attempt to use it directly. @headername{functional}
 */

#ifndef _BACKWARD_BINDERS_H
#define _BACKWARD_BINDERS_H 1

// Suppress deprecated warning for this file.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

// 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 @a 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 <em>1.3 - x</em> 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.
   *
   *  These functions are deprecated in C++11 and can be replaced by
   *  @c std::bind (or @c std::tr1::bind) which is more powerful and flexible,
   *  supporting functions with any number of arguments.  Uses of @c bind1st
   *  can be replaced by @c std::bind(f, x, std::placeholders::_1) and
   *  @c bind2nd by @c std::bind(f, std::placeholders::_1, x).
   *  @{
   */
  /// 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;

/// 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;

/// 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_VERSION
} // namespace

#pragma GCC diagnostic pop

#endif /* _BACKWARD_BINDERS_H */

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