1// { dg-options "-std=gnu++11" } 2 3// Copyright (C) 2010-2015 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 <list> 21#include <testsuite_hooks.h> 22 23template <class T> 24 struct C 25 { 26 T t_; 27 28 template <class U, 29 class = typename std::enable_if 30 < 31 !std::is_lvalue_reference<U>::value 32 >::type> 33 C(U&& u) : t_(std::forward<T>(std::move(u).get())) { } 34 }; 35 36class A 37{ 38 int data_; 39public: 40 explicit 41 A(int data = 1) 42 : data_(data) { } 43 44 ~A() { data_ = -1; } 45 46 void test() const 47 { 48 bool test __attribute__((unused)) = true; 49 VERIFY( data_ == 3 ); 50 } 51}; 52 53class Awrap 54{ 55 A& a_; 56public: 57 explicit Awrap(A& a) : a_(a) { } 58 const A& get() const { return a_; } 59 A& get() { return a_; } 60}; 61 62template <class C> 63 void test(C c) 64 { 65 c.t_.test(); 66 } 67 68// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html 69// Test D. 70int main() 71{ 72 std::list<C<const A&> > list; 73 A a(3); 74 C<const A&> c((Awrap(a))); 75 list.push_back(c); 76 test(c); 77 test(list.front()); 78} 79