1//===----------------------------------------------------------------------===//
2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3// See https://llvm.org/LICENSE.txt for license information.
4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5//
6//===----------------------------------------------------------------------===//
7
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9
10// constexpr void value() const &;
11// constexpr void value() &&;
12
13#include <cassert>
14#include <concepts>
15#include <expected>
16#include <type_traits>
17#include <utility>
18
19#include "MoveOnly.h"
20#include "test_macros.h"
21
22constexpr bool test() {
23 // const &
24 {
25 const std::expected<void, int> e;
26 e.value();
27 static_assert(std::is_same_v<decltype(e.value()), void>);
28 }
29
30 // &
31 {
32 std::expected<void, int> e;
33 e.value();
34 static_assert(std::is_same_v<decltype(e.value()), void>);
35 }
36
37 // &&
38 {
39 std::expected<void, int> e;
40 std::move(e).value();
41 static_assert(std::is_same_v<decltype(std::move(e).value()), void>);
42 }
43
44 // const &&
45 {
46 const std::expected<void, int> e;
47 std::move(e).value();
48 static_assert(std::is_same_v<decltype(std::move(e).value()), void>);
49 }
50
51 return true;
52}
53
54void testException() {
55#ifndef TEST_HAS_NO_EXCEPTIONS
56
57 // int
58 {
59 const std::expected<void, int> e(std::unexpect, 5);
60 try {
61 e.value();
62 assert(false);
63 } catch (const std::bad_expected_access<int>& ex) {
64 assert(ex.error() == 5);
65 }
66 }
67
68#endif // TEST_HAS_NO_EXCEPTIONS
69}
70
71int main(int, char**) {
72 test();
73 static_assert(test());
74 testException();
75 return 0;
76}
77

source code of libcxx/test/std/utilities/expected/expected.void/observers/value.pass.cpp