46 lines
1.2 KiB
C++
46 lines
1.2 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
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// <optional>
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// template <class T, class... Args>
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// constexpr optional<T> make_optional(Args&&... args);
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#include <optional>
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#include <string>
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#include <memory>
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#include <cassert>
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#include "test_macros.h"
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int main(int, char**)
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{
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{
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constexpr auto opt = std::make_optional<int>('a');
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static_assert(*opt == int('a'));
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}
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{
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std::string s = "123";
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auto opt = std::make_optional<std::string>(s);
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assert(*opt == "123");
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}
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{
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std::unique_ptr<int> s = std::make_unique<int>(3);
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auto opt = std::make_optional<std::unique_ptr<int>>(std::move(s));
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assert(**opt == 3);
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assert(s == nullptr);
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}
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{
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auto opt = std::make_optional<std::string>(4u, 'X');
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assert(*opt == "XXXX");
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}
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return 0;
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}
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