1 // { dg-options "-std=gnu++11" }
2 
3 // Copyright (C) 2010-2016 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 
23 template <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>
CC33       C(U&& u) : t_(std::forward<T>(std::move(u).get())) {}
34   };
35 
36 class A
37 {
38   int data_;
39 public:
40   explicit
A(int data=1)41   A(int data = 1)
42   : data_(data) { }
43 
~A()44   ~A() { data_ = -1; }
45 
test() const46   void test() const
47   {
48     bool test __attribute__((unused)) = true;
49     VERIFY( data_ == 3 );
50   }
51 };
52 
53 class Awrap
54 {
55   A a_;
56 public:
Awrap(const A & a)57   explicit Awrap(const A& a) : a_(a) { }
get() const58   A get() const { return a_; }
59 };
60 
61 template <class C>
test(C c)62 void test(C c)
63 {
64   c.t_.test();
65 }
66 
67 // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
68 // Test B.
main()69 int main()
70 {
71   std::list<C<A> > list;
72   A a(3);
73   C<A> c((Awrap(a)));
74   list.push_back(c);
75   test(c);
76   test(list.front());
77 }
78