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4415f7a5 | 1 | // { dg-options "-std=gnu++11" } |
ad269884 | 2 | |
818ab71a | 3 | // Copyright (C) 2010-2016 Free Software Foundation, Inc. |
ad269884 PC |
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> | |
33 | C(U&& u) : t_(std::forward<T>(std::move(u).get())) { } | |
34 | }; | |
35 | ||
36 | class A | |
37 | { | |
38 | int data_; | |
39 | public: | |
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 | ||
53 | class Awrap | |
54 | { | |
55 | A& a_; | |
56 | public: | |
57 | explicit Awrap(A& a) : a_(a) { } | |
58 | const A& get() const { return a_; } | |
59 | A& get() { return a_; } | |
60 | }; | |
61 | ||
62 | template <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. | |
70 | int 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 | } |