]>
Commit | Line | Data |
---|---|---|
47df7e19 | 1 | // { dg-do compile { target c++17 } } |
435e56fb | 2 | |
a945c346 | 3 | // Copyright (C) 2013-2024 Free Software Foundation, Inc. |
435e56fb 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 | ||
c7cbb4da | 16 | // You should have received a copy of the GNU General Public License along |
435e56fb VV |
17 | // with this library; see the file COPYING3. If not see |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | #include <optional> | |
21 | ||
22 | struct value_type | |
23 | { | |
24 | int i; | |
25 | }; | |
26 | ||
02c9b9cc | 27 | void test01() |
435e56fb VV |
28 | { |
29 | constexpr std::optional<value_type> o { value_type { 51 } }; | |
30 | constexpr value_type fallback { 3 }; | |
02c9b9cc JW |
31 | static_assert( o.value_or(fallback).i == 51 ); |
32 | static_assert( o.value_or(fallback).i == (*o).i ); | |
33 | } | |
34 | ||
35 | void test02() | |
36 | { | |
37 | constexpr std::optional<value_type> o; | |
38 | constexpr value_type fallback { 3 }; | |
39 | static_assert( o.value_or(fallback).i == 3 ); | |
40 | } | |
41 | ||
42 | template<typename T> | |
43 | constexpr std::optional<value_type> | |
44 | make_rvalue(T t) | |
45 | { return std::optional<value_type>{t}; } | |
46 | ||
47 | void test03() | |
48 | { | |
49 | constexpr value_type fallback { 3 }; | |
50 | static_assert( make_rvalue(value_type{51}).value_or(fallback).i == 51 ); | |
51 | } | |
52 | ||
53 | void test04() | |
54 | { | |
55 | constexpr value_type fallback { 3 }; | |
56 | static_assert( make_rvalue(std::nullopt).value_or(fallback).i == 3 ); | |
57 | } | |
58 | ||
59 | int main() | |
60 | { | |
61 | test01(); | |
62 | test02(); | |
63 | test03(); | |
64 | test04(); | |
435e56fb | 65 | } |