| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| // <optional> |
| |
| // optional<T>& operator=(const optional<T>& rhs); |
| |
| #include <optional> |
| #include <string> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| |
| using std::optional; |
| |
| struct X {}; |
| |
| struct Y |
| { |
| Y() = default; |
| Y& operator=(const Y&) { return *this; } |
| }; |
| |
| struct Z1 |
| { |
| Z1() = default; |
| Z1(Z1&&) = default; |
| Z1(const Z1&) = default; |
| Z1& operator=(Z1&&) = default; |
| Z1& operator=(const Z1&) = delete; |
| }; |
| |
| struct Z2 |
| { |
| Z2() = default; |
| Z2(Z2&&) = default; |
| Z2(const Z2&) = delete; |
| Z2& operator=(Z2&&) = default; |
| Z2& operator=(const Z2&) = default; |
| }; |
| |
| template <class T> |
| constexpr bool |
| test() |
| { |
| optional<T> opt; |
| optional<T> opt2; |
| opt = opt2; |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| { |
| using T = int; |
| static_assert((std::is_trivially_copy_assignable<optional<T>>::value), ""); |
| static_assert(test<T>(), ""); |
| } |
| { |
| using T = X; |
| static_assert((std::is_trivially_copy_assignable<optional<T>>::value), ""); |
| static_assert(test<T>(), ""); |
| } |
| static_assert(!(std::is_trivially_copy_assignable<optional<Y>>::value), ""); |
| static_assert(!(std::is_trivially_copy_assignable<optional<std::string>>::value), ""); |
| |
| static_assert(!(std::is_copy_assignable<optional<Z1>>::value), ""); |
| static_assert(!(std::is_copy_assignable<optional<Z2>>::value), ""); |
| |
| return 0; |
| } |