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15d9538c | 1 | // { dg-options "-std=gnu++14" } |
e3f166cf | 2 | // { dg-do run } |
3 | ||
f1717362 | 4 | // Copyright (C) 2013-2016 Free Software Foundation, Inc. |
e3f166cf | 5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
9 | // Free Software Foundation; either version 3, or (at your option) | |
10 | // any later version. | |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
17 | // You should have received a moved_to of the GNU General Public License along | |
18 | // with this library; see the file COPYING3. If not see | |
19 | // <http://www.gnu.org/licenses/>. | |
20 | ||
21 | #include <experimental/optional> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | int counter = 0; | |
25 | ||
26 | struct mixin_counter | |
27 | { | |
28 | mixin_counter() { ++counter; } | |
29 | mixin_counter(mixin_counter const&) { ++counter; } | |
30 | ~mixin_counter() { --counter; } | |
31 | }; | |
32 | ||
33 | struct value_type : private mixin_counter { }; | |
34 | ||
35 | int main() | |
36 | { | |
37 | using O = std::experimental::optional<value_type>; | |
38 | ||
39 | // Check std::experimental::nullopt_t and 'default' (= {}) assignment | |
40 | ||
41 | { | |
42 | O o; | |
43 | o = std::experimental::nullopt; | |
44 | VERIFY( !o ); | |
45 | } | |
46 | ||
47 | { | |
48 | O o { std::experimental::in_place }; | |
49 | o = std::experimental::nullopt; | |
50 | VERIFY( !o ); | |
51 | } | |
52 | ||
53 | { | |
54 | O o; | |
55 | o = {}; | |
56 | VERIFY( !o ); | |
57 | } | |
58 | ||
59 | { | |
60 | O o { std::experimental::in_place }; | |
61 | o = {}; | |
62 | VERIFY( !o ); | |
63 | } | |
64 | ||
65 | VERIFY( counter == 0 ); | |
66 | } |