1*38fd1498Szrj// TR1 utility -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj// Copyright (C) 2004-2018 Free Software Foundation, Inc. 4*38fd1498Szrj// 5*38fd1498Szrj// This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj// software; you can redistribute it and/or modify it under the 7*38fd1498Szrj// terms of the GNU General Public License as published by the 8*38fd1498Szrj// Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj// any later version. 10*38fd1498Szrj 11*38fd1498Szrj// This library is distributed in the hope that it will be useful, 12*38fd1498Szrj// but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj// GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj// Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj// permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj// 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj// You should have received a copy of the GNU General Public License and 21*38fd1498Szrj// a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj// <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj/** @file tr1/utility 26*38fd1498Szrj * This is a TR1 C++ Library header. 27*38fd1498Szrj */ 28*38fd1498Szrj 29*38fd1498Szrj#ifndef _GLIBCXX_TR1_UTILITY 30*38fd1498Szrj#define _GLIBCXX_TR1_UTILITY 1 31*38fd1498Szrj 32*38fd1498Szrj#pragma GCC system_header 33*38fd1498Szrj 34*38fd1498Szrj#include <bits/c++config.h> 35*38fd1498Szrj#include <bits/stl_relops.h> 36*38fd1498Szrj#include <bits/stl_pair.h> 37*38fd1498Szrj 38*38fd1498Szrjnamespace std _GLIBCXX_VISIBILITY(default) 39*38fd1498Szrj{ 40*38fd1498Szrj_GLIBCXX_BEGIN_NAMESPACE_VERSION 41*38fd1498Szrj 42*38fd1498Szrjnamespace tr1 43*38fd1498Szrj{ 44*38fd1498Szrj template<class _Tp> 45*38fd1498Szrj class tuple_size; 46*38fd1498Szrj 47*38fd1498Szrj template<int _Int, class _Tp> 48*38fd1498Szrj class tuple_element; 49*38fd1498Szrj 50*38fd1498Szrj // Various functions which give std::pair a tuple-like interface. 51*38fd1498Szrj template<class _Tp1, class _Tp2> 52*38fd1498Szrj struct tuple_size<std::pair<_Tp1, _Tp2> > 53*38fd1498Szrj { static const int value = 2; }; 54*38fd1498Szrj 55*38fd1498Szrj template<class _Tp1, class _Tp2> 56*38fd1498Szrj const int 57*38fd1498Szrj tuple_size<std::pair<_Tp1, _Tp2> >::value; 58*38fd1498Szrj 59*38fd1498Szrj template<class _Tp1, class _Tp2> 60*38fd1498Szrj struct tuple_element<0, std::pair<_Tp1, _Tp2> > 61*38fd1498Szrj { typedef _Tp1 type; }; 62*38fd1498Szrj 63*38fd1498Szrj template<class _Tp1, class _Tp2> 64*38fd1498Szrj struct tuple_element<1, std::pair<_Tp1, _Tp2> > 65*38fd1498Szrj { typedef _Tp2 type; }; 66*38fd1498Szrj 67*38fd1498Szrj template<int _Int> 68*38fd1498Szrj struct __pair_get; 69*38fd1498Szrj 70*38fd1498Szrj template<> 71*38fd1498Szrj struct __pair_get<0> 72*38fd1498Szrj { 73*38fd1498Szrj template<typename _Tp1, typename _Tp2> 74*38fd1498Szrj static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair) 75*38fd1498Szrj { return __pair.first; } 76*38fd1498Szrj 77*38fd1498Szrj template<typename _Tp1, typename _Tp2> 78*38fd1498Szrj static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair) 79*38fd1498Szrj { return __pair.first; } 80*38fd1498Szrj }; 81*38fd1498Szrj 82*38fd1498Szrj template<> 83*38fd1498Szrj struct __pair_get<1> 84*38fd1498Szrj { 85*38fd1498Szrj template<typename _Tp1, typename _Tp2> 86*38fd1498Szrj static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair) 87*38fd1498Szrj { return __pair.second; } 88*38fd1498Szrj 89*38fd1498Szrj template<typename _Tp1, typename _Tp2> 90*38fd1498Szrj static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair) 91*38fd1498Szrj { return __pair.second; } 92*38fd1498Szrj }; 93*38fd1498Szrj 94*38fd1498Szrj template<int _Int, class _Tp1, class _Tp2> 95*38fd1498Szrj inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type& 96*38fd1498Szrj get(std::pair<_Tp1, _Tp2>& __in) 97*38fd1498Szrj { return __pair_get<_Int>::__get(__in); } 98*38fd1498Szrj 99*38fd1498Szrj template<int _Int, class _Tp1, class _Tp2> 100*38fd1498Szrj inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type& 101*38fd1498Szrj get(const std::pair<_Tp1, _Tp2>& __in) 102*38fd1498Szrj { return __pair_get<_Int>::__const_get(__in); } 103*38fd1498Szrj} 104*38fd1498Szrj 105*38fd1498Szrj_GLIBCXX_END_NAMESPACE_VERSION 106*38fd1498Szrj} 107*38fd1498Szrj 108*38fd1498Szrj#endif // _GLIBCXX_TR1_UTILITY 109