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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
1.3 KiB
C++
54 lines
1.3 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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// template<class E2> friend constexpr bool operator==(const expected& x, const unexpected<E2>& e);
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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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struct Data {
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int i;
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constexpr Data(int ii) : i(ii) {}
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friend constexpr bool operator==(const Data& data, int ii) { return data.i == ii; }
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};
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constexpr bool test() {
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// x.has_value()
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{
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const std::expected<void, Data> e1;
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std::unexpected<int> un2(10);
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std::unexpected<int> un3(5);
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assert(e1 != un2);
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assert(e1 != un3);
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}
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// !x.has_value()
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{
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const std::expected<void, Data> e1(std::unexpect, 5);
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std::unexpected<int> un2(10);
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std::unexpected<int> un3(5);
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assert(e1 != un2);
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assert(e1 == un3);
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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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