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 ~expected();
11//
12// Effects: If has_value() is true, destroys val, otherwise destroys unex.
13//
14// Remarks: If is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true,
15// then this destructor is a trivial destructor.
16
17#include <cassert>
18#include <expected>
19#include <type_traits>
20#include <utility>
21#include <memory>
22
23#include "test_macros.h"
24
25// Test Remarks: If is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true,
26// then this destructor is a trivial destructor.
27struct NonTrivial {
28 ~NonTrivial() {}
29};
30
31static_assert(std::is_trivially_destructible_v<std::expected<int, int>>);
32static_assert(!std::is_trivially_destructible_v<std::expected<NonTrivial, int>>);
33static_assert(!std::is_trivially_destructible_v<std::expected<int, NonTrivial>>);
34static_assert(!std::is_trivially_destructible_v<std::expected<NonTrivial, NonTrivial>>);
35
36struct TrackedDestroy {
37 bool& destroyed;
38 constexpr TrackedDestroy(bool& b) : destroyed(b) {}
39 constexpr ~TrackedDestroy() { destroyed = true; }
40};
41
42constexpr bool test() {
43 // has value
44 {
45 bool valueDestroyed = false;
46 { [[maybe_unused]] std::expected<TrackedDestroy, TrackedDestroy> e(std::in_place, valueDestroyed); }
47 assert(valueDestroyed);
48 }
49
50 // has error
51 {
52 bool errorDestroyed = false;
53 { [[maybe_unused]] std::expected<TrackedDestroy, TrackedDestroy> e(std::unexpect, errorDestroyed); }
54 assert(errorDestroyed);
55 }
56
57 return true;
58}
59
60int main(int, char**) {
61 std::expected<std::unique_ptr<int>, int> a = std::make_unique<int>(42);
62
63 test();
64 static_assert(test());
65 return 0;
66}
67

source code of libcxx/test/std/utilities/expected/expected.expected/dtor.pass.cpp