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//===----------------------------------------------------------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Older Clangs do not support the C++20 feature to constrain destructors
// XFAIL: clang-14, apple-clang-14
// constexpr ~expected();
//
// Effects: If has_value() is true, destroys val, otherwise destroys unex.
//
// Remarks: If is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true,
// then this destructor is a trivial destructor.
#include <cassert>
#include <expected>
#include <type_traits>
#include <utility>
#include <memory>
#include "test_macros.h"
// Test Remarks: If is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true,
// then this destructor is a trivial destructor.
struct NonTrivial {
~NonTrivial() {}
};
static_assert(std::is_trivially_destructible_v<std::expected<int, int>>);
static_assert(!std::is_trivially_destructible_v<std::expected<NonTrivial, int>>);
static_assert(!std::is_trivially_destructible_v<std::expected<int, NonTrivial>>);
static_assert(!std::is_trivially_destructible_v<std::expected<NonTrivial, NonTrivial>>);
struct TrackedDestroy {
bool& destroyed;
constexpr TrackedDestroy(bool& b) : destroyed(b) {}
constexpr ~TrackedDestroy() { destroyed = true; }
};
constexpr bool test() {
// has value
{
bool valueDestroyed = false;
{ [[maybe_unused]] std::expected<TrackedDestroy, TrackedDestroy> e(std::in_place, valueDestroyed); }
assert(valueDestroyed);
}
// has error
{
bool errorDestroyed = false;
{ [[maybe_unused]] std::expected<TrackedDestroy, TrackedDestroy> e(std::unexpect, errorDestroyed); }
assert(errorDestroyed);
}
return true;
}
int main(int, char**) {
std::expected<std::unique_ptr<int>, int> a = std::make_unique<int>(42);
test();
static_assert(test());
return 0;
}
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