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      1 // <utility> -*- C++ -*-
      2 
      3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 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) 1996,1997
     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 include/utility
     53  *  This is a Standard C++ Library header. 
     54  */
     55 
     56 #ifndef _GLIBCXX_UTILITY
     57 #define _GLIBCXX_UTILITY 1
     58 
     59 #pragma GCC system_header
     60 
     61 /**
     62  * @defgroup utilities Utilities
     63  *
     64  * Components deemed generally useful. Includes pair, tuple,
     65  * forward/move helpers, ratio, function object, metaprogramming and
     66  * type traits, time, date, and memory functions.
     67  */
     68 
     69 #include <bits/c++config.h>
     70 #include <bits/stl_relops.h>
     71 #include <bits/stl_pair.h>
     72 
     73 #ifdef __GXX_EXPERIMENTAL_CXX0X__
     74 #include <bits/move.h>
     75 #include <initializer_list>
     76 
     77 namespace std _GLIBCXX_VISIBILITY(default)
     78 {
     79 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     80 
     81   template<class _Tp>
     82     class tuple_size;
     83 
     84   template<std::size_t _Int, class _Tp>
     85     class tuple_element;
     86 
     87    // Various functions which give std::pair a tuple-like interface.
     88   template<class _Tp1, class _Tp2>
     89     struct tuple_size<std::pair<_Tp1, _Tp2> >
     90     { static const std::size_t value = 2; };
     91 
     92   template<class _Tp1, class _Tp2>
     93     const std::size_t
     94     tuple_size<std::pair<_Tp1, _Tp2> >::value;
     95 
     96   template<class _Tp1, class _Tp2>
     97     struct tuple_element<0, std::pair<_Tp1, _Tp2> >
     98     { typedef _Tp1 type; };
     99  
    100   template<class _Tp1, class _Tp2>
    101     struct tuple_element<1, std::pair<_Tp1, _Tp2> >
    102     { typedef _Tp2 type; };
    103 
    104   template<std::size_t _Int>
    105     struct __pair_get;
    106 
    107   template<>
    108     struct __pair_get<0>
    109     {
    110       template<typename _Tp1, typename _Tp2>
    111       static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
    112       { return __pair.first; }
    113 
    114       template<typename _Tp1, typename _Tp2>
    115       static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
    116       { return __pair.first; }
    117     };
    118 
    119   template<>
    120     struct __pair_get<1>
    121     {
    122       template<typename _Tp1, typename _Tp2>
    123       static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
    124       { return __pair.second; }
    125 
    126       template<typename _Tp1, typename _Tp2>
    127       static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
    128       { return __pair.second; }
    129     };
    130 
    131   template<std::size_t _Int, class _Tp1, class _Tp2>
    132     inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
    133     get(std::pair<_Tp1, _Tp2>& __in)
    134     { return __pair_get<_Int>::__get(__in); }
    135 
    136   template<std::size_t _Int, class _Tp1, class _Tp2>
    137     inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
    138     get(const std::pair<_Tp1, _Tp2>& __in)
    139     { return __pair_get<_Int>::__const_get(__in); }
    140 
    141 _GLIBCXX_END_NAMESPACE_VERSION
    142 } // namespace
    143 
    144 #endif
    145 
    146 #endif /* _GLIBCXX_UTILITY */
    147