1 | //===----------------------------------------------------------------------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
10 | |
11 | // constexpr ~expected(); |
12 | // |
13 | // Effects: If has_value() is true, destroys val, otherwise destroys unex. |
14 | // |
15 | // Remarks: If is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true, |
16 | // then this destructor is a trivial destructor. |
17 | |
18 | #include <cassert> |
19 | #include <expected> |
20 | #include <type_traits> |
21 | #include <utility> |
22 | #include <memory> |
23 | |
24 | #include "test_macros.h" |
25 | |
26 | // Test Remarks: If is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true, |
27 | // then this destructor is a trivial destructor. |
28 | struct NonTrivial { |
29 | ~NonTrivial() {} |
30 | }; |
31 | |
32 | static_assert(std::is_trivially_destructible_v<std::expected<int, int>>); |
33 | static_assert(!std::is_trivially_destructible_v<std::expected<NonTrivial, int>>); |
34 | static_assert(!std::is_trivially_destructible_v<std::expected<int, NonTrivial>>); |
35 | static_assert(!std::is_trivially_destructible_v<std::expected<NonTrivial, NonTrivial>>); |
36 | |
37 | struct TrackedDestroy { |
38 | bool& destroyed; |
39 | constexpr TrackedDestroy(bool& b) : destroyed(b) {} |
40 | constexpr ~TrackedDestroy() { destroyed = true; } |
41 | }; |
42 | |
43 | constexpr bool test() { |
44 | // has value |
45 | { |
46 | bool valueDestroyed = false; |
47 | { [[maybe_unused]] std::expected<TrackedDestroy, TrackedDestroy> e(std::in_place, valueDestroyed); } |
48 | assert(valueDestroyed); |
49 | } |
50 | |
51 | // has error |
52 | { |
53 | bool errorDestroyed = false; |
54 | { [[maybe_unused]] std::expected<TrackedDestroy, TrackedDestroy> e(std::unexpect, errorDestroyed); } |
55 | assert(errorDestroyed); |
56 | } |
57 | |
58 | return true; |
59 | } |
60 | |
61 | int main(int, char**) { |
62 | std::expected<std::unique_ptr<int>, int> a = std::make_unique<int>(42); |
63 | |
64 | test(); |
65 | static_assert(test()); |
66 | return 0; |
67 | } |
68 | |