| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <functional> |
| // |
| // reference_wrapper |
| // |
| // template <class U> |
| // reference_wrapper(U&&); |
| |
| #include <functional> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct B {}; |
| |
| struct A1 { |
| mutable B b_; |
| TEST_CONSTEXPR operator B&() const { return b_; } |
| }; |
| |
| struct A2 { |
| mutable B b_; |
| TEST_CONSTEXPR operator B&() const TEST_NOEXCEPT { return b_; } |
| }; |
| |
| void implicitly_convert(std::reference_wrapper<B>) TEST_NOEXCEPT; |
| |
| TEST_CONSTEXPR_CXX20 bool test() |
| { |
| { |
| A1 a; |
| ASSERT_NOT_NOEXCEPT(implicitly_convert(a)); |
| std::reference_wrapper<B> b1 = a; |
| assert(&b1.get() == &a.b_); |
| ASSERT_NOT_NOEXCEPT(b1 = a); |
| b1 = a; |
| assert(&b1.get() == &a.b_); |
| } |
| { |
| A2 a; |
| ASSERT_NOEXCEPT(implicitly_convert(a)); |
| std::reference_wrapper<B> b2 = a; |
| assert(&b2.get() == &a.b_); |
| ASSERT_NOEXCEPT(b2 = a); |
| b2 = a; |
| assert(&b2.get() == &a.b_); |
| } |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| #if TEST_STD_VER > 17 |
| static_assert(test()); |
| #endif |
| |
| return 0; |
| } |