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de4fa746 | 1 | // { dg-options "-std=gnu++17" } |
400f7753 | 2 | // { dg-do compile { target c++17 } } |
de4fa746 | 3 | |
fbd26352 | 4 | // Copyright (C) 2013-2019 Free Software Foundation, Inc. |
de4fa746 | 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 | ||
a9aab74c | 17 | // You should have received a copy of the GNU General Public License along |
de4fa746 | 18 | // with this library; see the file COPYING3. If not see |
19 | // <http://www.gnu.org/licenses/>. | |
20 | ||
21 | #include <optional> | |
22 | ||
23 | struct value_type | |
24 | { | |
25 | int i; | |
26 | }; | |
27 | ||
88dbeb04 | 28 | void test01() |
de4fa746 | 29 | { |
30 | constexpr std::optional<value_type> o { value_type { 51 } }; | |
31 | constexpr value_type fallback { 3 }; | |
88dbeb04 | 32 | static_assert( o.value_or(fallback).i == 51 ); |
33 | static_assert( o.value_or(fallback).i == (*o).i ); | |
34 | } | |
35 | ||
36 | void test02() | |
37 | { | |
38 | constexpr std::optional<value_type> o; | |
39 | constexpr value_type fallback { 3 }; | |
40 | static_assert( o.value_or(fallback).i == 3 ); | |
41 | } | |
42 | ||
43 | template<typename T> | |
44 | constexpr std::optional<value_type> | |
45 | make_rvalue(T t) | |
46 | { return std::optional<value_type>{t}; } | |
47 | ||
48 | void test03() | |
49 | { | |
50 | constexpr value_type fallback { 3 }; | |
51 | static_assert( make_rvalue(value_type{51}).value_or(fallback).i == 51 ); | |
52 | } | |
53 | ||
54 | void test04() | |
55 | { | |
56 | constexpr value_type fallback { 3 }; | |
57 | static_assert( make_rvalue(std::nullopt).value_or(fallback).i == 3 ); | |
58 | } | |
59 | ||
60 | int main() | |
61 | { | |
62 | test01(); | |
63 | test02(); | |
64 | test03(); | |
65 | test04(); | |
de4fa746 | 66 | } |