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47df7e19 | 1 | // { dg-do run { target c++17 } } |
435e56fb | 2 | |
99dee823 | 3 | // Copyright (C) 2013-2021 Free Software Foundation, Inc. |
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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 | ||
c7cbb4da | 16 | // You should have received a copy of the GNU General Public License along |
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17 | // with this library; see the file COPYING3. If not see |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | #include <optional> | |
a577f786 | 21 | #include <vector> |
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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::optional<value_type>; | |
38 | ||
39 | // Check std::nullopt_t and 'default' (= {}) assignment | |
40 | ||
41 | { | |
42 | O o; | |
43 | o = std::nullopt; | |
44 | VERIFY( !o ); | |
45 | } | |
46 | ||
47 | { | |
48 | O o { std::in_place }; | |
49 | o = std::nullopt; | |
50 | VERIFY( !o ); | |
51 | } | |
52 | ||
53 | { | |
54 | O o; | |
55 | o = {}; | |
56 | VERIFY( !o ); | |
57 | } | |
58 | ||
59 | { | |
60 | O o { std::in_place }; | |
61 | o = {}; | |
62 | VERIFY( !o ); | |
63 | } | |
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64 | { |
65 | std::optional<std::vector<int>> ovi{{1, 2, 3}}; | |
66 | VERIFY(ovi->size() == 3); | |
67 | VERIFY((*ovi)[0] == 1 && (*ovi)[1] == 2 && (*ovi)[2] == 3); | |
68 | ovi = {4, 5, 6, 7}; | |
69 | VERIFY(ovi->size() == 4); | |
70 | VERIFY((*ovi)[0] == 4 && (*ovi)[1] == 5 && | |
71 | (*ovi)[2] == 6 && (*ovi)[3] == 7); | |
72 | } | |
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73 | VERIFY( counter == 0 ); |
74 | } |