1 // TR1 utility -*- C++ -*-
3 // Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 2, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
31 * This is a TR1 C++ Library header.
35 #define _TR1_UTILITY 1
41 _GLIBCXX_BEGIN_NAMESPACE(_GLIBCXX_TR1)
43 template<class _Tp> class tuple_size;
44 template<int _Int, class _Tp> class tuple_element;
46 // Various functions which give std::pair a tuple-like interface.
47 template<class _Tp1, class _Tp2>
48 struct tuple_size<std::pair<_Tp1, _Tp2> >
49 { static const int value = 2; };
51 template<class _Tp1, class _Tp2>
52 const int tuple_size<std::pair<_Tp1, _Tp2> >::value;
54 template<class _Tp1, class _Tp2>
55 struct tuple_element<0, std::pair<_Tp1, _Tp2> >
56 { typedef _Tp1 type; };
58 template<class _Tp1, class _Tp2>
59 struct tuple_element<1, std::pair<_Tp1, _Tp2> >
60 { typedef _Tp2 type; };
63 template<int _Int> struct __pair_get;
68 template<typename _Tp1, typename _Tp2>
69 static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
70 { return __pair.first; }
72 template<typename _Tp1, typename _Tp2>
73 static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
74 { return __pair.first; }
80 template<typename _Tp1, typename _Tp2>
81 static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
82 { return __pair.second; }
84 template<typename _Tp1, typename _Tp2>
85 static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
86 { return __pair.second; }
89 template<int _Int, class _Tp1, class _Tp2>
90 inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
91 get(std::pair<_Tp1, _Tp2>& __in)
92 { return __pair_get<_Int>::__get(__in); }
94 template<int _Int, class _Tp1, class _Tp2>
95 inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
96 get(const std::pair<_Tp1, _Tp2>& __in)
97 { return __pair_get<_Int>::__const_get(__in); }
99 _GLIBCXX_END_NAMESPACE