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

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