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