1// { dg-do compile } 2// { dg-options "-std=gnu++11" } 3 4// Copyright (C) 2013-2015 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// You should have received a copy of the GNU General Public License along 18// with this library; see the file COPYING3. If not see 19// <http://www.gnu.org/licenses/>. 20 21#include <utility> 22#include <type_traits> 23 24typedef std::pair<int, long> test_type; 25 26static_assert( std::tuple_size<test_type>::value == 2, "size is 2" ); 27 28template<std::size_t N, typename T> 29 using Tuple_elt = typename std::tuple_element<N, T>::type; 30 31using std::is_same; 32 33static_assert( is_same<Tuple_elt<0, test_type>, test_type::first_type>::value, 34 "first type is int" ); 35 36static_assert( is_same<Tuple_elt<1, test_type>, test_type::second_type>::value, 37 "second type is long" ); 38