2 // TR1 utility -*- C++ -*-
4 // Copyright (C) 2007 Free Software Foundation, Inc.
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 2, or (at your option)
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.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING. If not, write to the Free
19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
31 /** @file tr1_impl/utility
32 * This is an internal header file, included by other library headers.
33 * You should not attempt to use it directly.
38 _GLIBCXX_BEGIN_NAMESPACE_TR1
40 template<class _Tp> class tuple_size;
41 template<int _Int, class _Tp> class tuple_element;
43 // Various functions which give std::pair a tuple-like interface.
44 template<class _Tp1, class _Tp2>
45 struct tuple_size<std::pair<_Tp1, _Tp2> >
46 { static const int value = 2; };
48 template<class _Tp1, class _Tp2>
49 const int tuple_size<std::pair<_Tp1, _Tp2> >::value;
51 template<class _Tp1, class _Tp2>
52 struct tuple_element<0, std::pair<_Tp1, _Tp2> >
53 { typedef _Tp1 type; };
55 template<class _Tp1, class _Tp2>
56 struct tuple_element<1, std::pair<_Tp1, _Tp2> >
57 { typedef _Tp2 type; };
60 template<int _Int> struct __pair_get;
65 template<typename _Tp1, typename _Tp2>
66 static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
67 { return __pair.first; }
69 template<typename _Tp1, typename _Tp2>
70 static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
71 { return __pair.first; }
77 template<typename _Tp1, typename _Tp2>
78 static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
79 { return __pair.second; }
81 template<typename _Tp1, typename _Tp2>
82 static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
83 { return __pair.second; }
86 template<int _Int, class _Tp1, class _Tp2>
87 inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
88 get(std::pair<_Tp1, _Tp2>& __in)
89 { return __pair_get<_Int>::__get(__in); }
91 template<int _Int, class _Tp1, class _Tp2>
92 inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
93 get(const std::pair<_Tp1, _Tp2>& __in)
94 { return __pair_get<_Int>::__const_get(__in); }
96 _GLIBCXX_END_NAMESPACE_TR1