e356f681f6
Implement `std::expected` https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0323r12.html Added tests Differential Revision: https://reviews.llvm.org/D124516 address comment
54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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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 bool has_value() const noexcept;
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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 "test_macros.h"
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// Test noexcept
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template <class T>
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concept HasValueNoexcept =
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requires(T t) {
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{ t.has_value() } noexcept;
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};
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struct Foo {};
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static_assert(!HasValueNoexcept<Foo>);
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static_assert(HasValueNoexcept<std::expected<int, int>>);
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static_assert(HasValueNoexcept<const std::expected<int, int>>);
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constexpr bool test() {
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// has_value
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{
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const std::expected<void, int> e;
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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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const std::expected<void, int> e(std::unexpect, 5);
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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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