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47df7e19 | 1 | // { dg-do run { target c++17 } } |
435e56fb | 2 | |
7adcbafe | 3 | // Copyright (C) 2013-2022 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> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | int counter = 0; | |
24 | ||
25 | struct mixin_counter | |
26 | { | |
27 | mixin_counter() { ++counter; } | |
28 | mixin_counter(mixin_counter const&) { ++counter; } | |
29 | ~mixin_counter() { --counter; } | |
30 | }; | |
31 | ||
32 | struct value_type : private mixin_counter | |
33 | { | |
34 | value_type() = default; | |
35 | value_type(int) : state(1) { } | |
36 | value_type(std::initializer_list<char>, const char*) : state(2) { } | |
37 | int state = 0; | |
38 | }; | |
39 | ||
40 | int main() | |
41 | { | |
42 | using O = std::optional<value_type>; | |
43 | ||
44 | // Check emplace | |
45 | ||
46 | { | |
47 | O o; | |
48 | o.emplace(); | |
49 | VERIFY( o && o->state == 0 ); | |
50 | } | |
51 | { | |
52 | O o { std::in_place, 0 }; | |
53 | o.emplace(); | |
54 | VERIFY( o && o->state == 0 ); | |
55 | } | |
56 | ||
57 | { | |
58 | O o; | |
59 | o.emplace(0); | |
60 | VERIFY( o && o->state == 1 ); | |
61 | } | |
62 | { | |
63 | O o { std::in_place }; | |
64 | o.emplace(0); | |
65 | VERIFY( o && o->state == 1 ); | |
66 | } | |
67 | ||
68 | { | |
69 | O o; | |
70 | o.emplace({ 'a' }, ""); | |
71 | VERIFY( o && o->state == 2 ); | |
72 | } | |
73 | { | |
74 | O o { std::in_place }; | |
75 | o.emplace({ 'a' }, ""); | |
76 | VERIFY( o && o->state == 2 ); | |
77 | } | |
df990182 VV |
78 | { |
79 | O o; | |
80 | VERIFY(&o.emplace(0) == &*o); | |
81 | VERIFY(&o.emplace({ 'a' }, "") == &*o); | |
82 | } | |
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83 | |
84 | static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" ); | |
85 | ||
86 | VERIFY( counter == 0 ); | |
87 | } |