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1 | // { dg-do compile { target c++17 } } |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2018-2023 Free Software Foundation, Inc. |
4fea8205 VV |
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 <optional> | |
21 | ||
22 | constexpr bool f() | |
23 | { | |
24 | std::optional<int> o1{42}; | |
25 | std::optional<int> o2; | |
26 | o2 = o1; | |
27 | return (o1 == o2); | |
28 | } | |
29 | ||
30 | constexpr bool f2() | |
31 | { | |
32 | std::optional<int> o1{42}; | |
33 | std::optional<int> o2; | |
34 | std::optional<int> o3; | |
35 | o2 = o1; | |
36 | o3 = std::move(o2); | |
37 | return (o1 == o3); | |
38 | } | |
39 | ||
40 | void g() | |
41 | { | |
42 | constexpr bool b = f(); | |
43 | static_assert(b); | |
44 | constexpr bool b2 = f2(); | |
45 | static_assert(b2); | |
46 | } | |
47 | ||
48 | struct NonTrivialButConstexpr | |
49 | { | |
50 | int dummy; | |
51 | NonTrivialButConstexpr() = default; | |
52 | constexpr NonTrivialButConstexpr(int val) : dummy(val) {} | |
53 | NonTrivialButConstexpr(const NonTrivialButConstexpr&) = default; | |
54 | NonTrivialButConstexpr(NonTrivialButConstexpr&&) = default; | |
55 | constexpr NonTrivialButConstexpr& | |
56 | operator=(const NonTrivialButConstexpr& other) | |
57 | { | |
58 | dummy = other.dummy; | |
59 | return *this; | |
60 | } | |
61 | constexpr NonTrivialButConstexpr& | |
62 | operator=(NonTrivialButConstexpr&& other) | |
63 | { | |
64 | dummy = other.dummy; | |
65 | return *this; | |
66 | } | |
67 | }; | |
68 | ||
69 | constexpr bool f3() | |
70 | { | |
71 | std::optional<NonTrivialButConstexpr> d1, d2; | |
72 | d1 = d2; | |
73 | std::optional<NonTrivialButConstexpr> o1{42}; | |
74 | std::optional<NonTrivialButConstexpr> o2{22}; | |
75 | o2 = o1; | |
76 | return ((*o1).dummy == (*o2).dummy && o1->dummy == o2->dummy); | |
77 | } | |
78 | ||
79 | constexpr bool f4() | |
80 | { | |
81 | std::optional<NonTrivialButConstexpr> d1, d2; | |
82 | d1 = std::move(d2); | |
83 | std::optional<NonTrivialButConstexpr> o1{42}; | |
84 | std::optional<NonTrivialButConstexpr> o2{22}; | |
85 | std::optional<NonTrivialButConstexpr> o3{33}; | |
86 | o2 = o1; | |
87 | o3 = std::move(o2); | |
88 | return ((*o1).dummy == (*o3).dummy && o1->dummy == o3->dummy); | |
89 | } | |
90 | ||
91 | void g2() | |
92 | { | |
93 | constexpr bool b = f3(); | |
94 | static_assert(b); | |
95 | constexpr bool b2 = f4(); | |
96 | static_assert(b2); | |
97 | } |