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75 lines
1.6 KiB
C++
75 lines
1.6 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++98, c++03, c++11, c++14
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// <optional>
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// optional<T>& operator=(optional<T>&& rhs);
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#include <optional>
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#include <string>
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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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using std::optional;
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struct X {};
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struct Y
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{
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Y() = default;
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Y& operator=(Y&&) { return *this; }
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};
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struct Z1
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{
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Z1() = default;
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Z1(Z1&&) = default;
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Z1& operator=(Z1&&) = delete;
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};
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struct Z2
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{
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Z2() = default;
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Z2(Z2&&) = delete;
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Z2& operator=(Z2&&) = default;
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};
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template <class T>
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constexpr bool
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test()
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{
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optional<T> opt;
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optional<T> opt2;
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opt = std::move(opt2);
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return true;
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}
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int main(int, char**)
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{
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{
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using T = int;
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static_assert((std::is_trivially_copy_constructible<optional<T>>::value), "");
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static_assert(test<T>(), "");
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}
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{
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using T = X;
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static_assert((std::is_trivially_copy_constructible<optional<T>>::value), "");
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static_assert(test<T>(), "");
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}
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static_assert(!(std::is_trivially_move_assignable<optional<Y>>::value), "");
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static_assert(!(std::is_trivially_move_assignable<optional<std::string>>::value), "");
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static_assert(!(std::is_move_assignable<optional<Z1>>::value), "");
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static_assert(!(std::is_move_assignable<optional<Z2>>::value), "");
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return 0;
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}
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