6a54dfbfe5
Also standardize the license comment in several files where it was different from what we normally do.
59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// constexpr void emplace() noexcept;
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//
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// Effects: If has_value() is false, destroys unex and sets has_val to true.
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#include <cassert>
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#include <concepts>
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#include <expected>
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#include <type_traits>
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#include <utility>
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#include "../../types.h"
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#include "test_macros.h"
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template <class T>
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concept EmplaceNoexcept =
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requires(T t) {
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{ t.emplace() } noexcept;
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};
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static_assert(!EmplaceNoexcept<int>);
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static_assert(EmplaceNoexcept<std::expected<void, int>>);
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constexpr bool test() {
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// has_value
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{
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std::expected<void, int> e;
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e.emplace();
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assert(e.has_value());
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}
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// !has_value
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{
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Traced::state state{};
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std::expected<int, Traced> e(std::unexpect, state, 5);
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e.emplace();
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assert(state.dtorCalled);
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assert(e.has_value());
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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