release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/include/c++/4.5.3/backward/binders.h

   1 // Functor implementations -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 /*
  27  *
  28  * Copyright (c) 1994
  29  * Hewlett-Packard Company
  30  *
  31  * Permission to use, copy, modify, distribute and sell this software
  32  * and its documentation for any purpose is hereby granted without fee,
  33  * provided that the above copyright notice appear in all copies and
  34  * that both that copyright notice and this permission notice appear
  35  * in supporting documentation.  Hewlett-Packard Company makes no
  36  * representations about the suitability of this software for any
  37  * purpose.  It is provided "as is" without express or implied warranty.
  38  *
  39  *
  40  * Copyright (c) 1996-1998
  41  * Silicon Graphics Computer Systems, Inc.
  42  *
  43  * Permission to use, copy, modify, distribute and sell this software
  44  * and its documentation for any purpose is hereby granted without fee,
  45  * provided that the above copyright notice appear in all copies and
  46  * that both that copyright notice and this permission notice appear
  47  * in supporting documentation.  Silicon Graphics makes no
  48  * representations about the suitability of this software for any
  49  * purpose.  It is provided "as is" without express or implied warranty.
  50  */
  51
  52 /** @file backward/binders.h
  53  *  This is an internal header file, included by other library headers.
  54  *  You should not attempt to use it directly.
  55  */
  56
  57 #ifndef _BACKWARD_BINDERS_H
  58 #define _BACKWARD_BINDERS_H 1
  59
  60 _GLIBCXX_BEGIN_NAMESPACE(std)
  61
  62   // 20.3.6 binders
  63   /** @defgroup binders Binder Classes
  64    * @ingroup functors
  65    *
  66    *  Binders turn functions/functors with two arguments into functors
  67    *  with a single argument, storing an argument to be applied later.
  68    *  For example, a variable @c B of type @c binder1st is constructed
  69    *  from a functor @c f and an argument @c x. Later, B's @c
  70    *  operator() is called with a single argument @c y. The return
  71    *  value is the value of @c f(x,y). @c B can be @a called with
  72    *  various arguments (y1, y2, ...) and will in turn call @c
  73    *  f(x,y1), @c f(x,y2), ...
  74    *
  75    *  The function @c bind1st is provided to save some typing. It takes the
  76    *  function and an argument as parameters, and returns an instance of
  77    *  @c binder1st.
  78    *
  79    *  The type @c binder2nd and its creator function @c bind2nd do the same
  80    *  thing, but the stored argument is passed as the second parameter instead
  81    *  of the first, e.g., @c bind2nd(std::minus<float>,1.3) will create a
  82    *  functor whose @c operator() accepts a floating-point number, subtracts
  83    *  1.3 from it, and returns the result. (If @c bind1st had been used,
  84    *  the functor would perform <em>1.3 - x</em> instead.
  85    *
  86    *  Creator-wrapper functions like @c bind1st are intended to be used in
  87    *  calling algorithms. Their return values will be temporary objects.
  88    *  (The goal is to not require you to type names like
  89    *  @c std::binder1st<std::plus<int>> for declaring a variable to hold the
  90    *  return value from @c bind1st(std::plus<int>,5).
  91    *
  92    *  These become more useful when combined with the composition functions.
  93    *
  94    *  @{
  95    */
  96   /// One of the @link binders binder functors@endlink.
  97   template<typename _Operation>
  98     class binder1st
  99     : public unary_function<typename _Operation::second_argument_type,
 100                             typename _Operation::result_type>
 101     {
 102     protected:
 103       _Operation op;
 104       typename _Operation::first_argument_type value;
 105
 106     public:
 107       binder1st(const _Operation& __x,
 108                 const typename _Operation::first_argument_type& __y)
 109       : op(__x), value(__y) { }
 110
 111       typename _Operation::result_type
 112       operator()(const typename _Operation::second_argument_type& __x) const
 113       { return op(value, __x); }
 114
 115       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 116       // 109.  Missing binders for non-const sequence elements
 117       typename _Operation::result_type
 118       operator()(typename _Operation::second_argument_type& __x) const
 119       { return op(value, __x); }
 120     } _GLIBCXX_DEPRECATED_ATTR;
 121
 122   /// One of the @link binders binder functors@endlink.
 123   template<typename _Operation, typename _Tp>
 124     inline binder1st<_Operation>
 125     bind1st(const _Operation& __fn, const _Tp& __x)
 126     {
 127       typedef typename _Operation::first_argument_type _Arg1_type;
 128       return binder1st<_Operation>(__fn, _Arg1_type(__x));
 129     }
 130
 131   /// One of the @link binders binder functors@endlink.
 132   template<typename _Operation>
 133     class binder2nd
 134     : public unary_function<typename _Operation::first_argument_type,
 135                             typename _Operation::result_type>
 136     {
 137     protected:
 138       _Operation op;
 139       typename _Operation::second_argument_type value;
 140
 141     public:
 142       binder2nd(const _Operation& __x,
 143                 const typename _Operation::second_argument_type& __y)
 144       : op(__x), value(__y) { }
 145
 146       typename _Operation::result_type
 147       operator()(const typename _Operation::first_argument_type& __x) const
 148       { return op(__x, value); }
 149
 150       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 151       // 109.  Missing binders for non-const sequence elements
 152       typename _Operation::result_type
 153       operator()(typename _Operation::first_argument_type& __x) const
 154       { return op(__x, value); }
 155     } _GLIBCXX_DEPRECATED_ATTR;
 156
 157   /// One of the @link binders binder functors@endlink.
 158   template<typename _Operation, typename _Tp>
 159     inline binder2nd<_Operation>
 160     bind2nd(const _Operation& __fn, const _Tp& __x)
 161     {
 162       typedef typename _Operation::second_argument_type _Arg2_type;
 163       return binder2nd<_Operation>(__fn, _Arg2_type(__x));
 164     }
 165   /** @}  */
 166
 167 _GLIBCXX_END_NAMESPACE
 168
 169 #endif /* _BACKWARD_BINDERS_H */