1// { dg-options "-std=gnu++11" } 2 3// Copyright (C) 2011-2015 Free Software Foundation, Inc. 4// 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 3, or (at your option) 9// any later version. 10 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. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING3. If not see 18// <http://www.gnu.org/licenses/>. 19 20#include <tuple> 21#include <type_traits> 22#include <memory> 23#include <testsuite_hooks.h> 24 25template<typename T> 26 typename std::decay<T>::type copy(T&& x) 27 { return std::forward<T>(x); } 28 29// libstdc++/48476 30void test01() 31{ 32 bool test __attribute__((unused)) = true; 33 34 std::shared_ptr<int> p(new int()), q, r; 35 36 std::tuple<std::shared_ptr<int>&, int> t0(p, 23), t1(q, 0); 37 t1 = copy(t0); // shall be equivalent to 38 // q = p; std::get<1>(t1) = std::get<1>(t0); 39 VERIFY( q == p ); 40 41 std::tuple<std::shared_ptr<int>&, char> t2(r, 0); 42 t2 = copy(t1); // shall be equivalent to 43 // r = q; std::get<1>(t2) = std::get<1>(t1); 44 VERIFY( r == q ); 45} 46 47int main() 48{ 49 test01(); 50 return 0; 51} 52