| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // 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++03, c++11, c++14 |
| // REQUIRES: c++experimental |
| |
| // <experimental/memory> |
| |
| // observer_ptr |
| // |
| // constexpr void swap(observer_ptr& other) noexcept; |
| // |
| // template <class W> |
| // void swap(observer_ptr<W>& lhs, observer_ptr<W>& rhs) noexcept; |
| |
| #include <experimental/memory> |
| #include <type_traits> |
| #include <cassert> |
| |
| template <class T, class Object = T> |
| constexpr void test_swap() { |
| using Ptr = std::experimental::observer_ptr<T>; |
| Object obj1, obj2; |
| |
| { |
| Ptr ptr1(&obj1); |
| Ptr ptr2(&obj2); |
| |
| assert(ptr1.get() == &obj1); |
| assert(ptr2.get() == &obj2); |
| |
| ptr1.swap(ptr2); |
| |
| assert(ptr1.get() == &obj2); |
| assert(ptr2.get() == &obj1); |
| |
| static_assert(noexcept(ptr1.swap(ptr2))); |
| static_assert(std::is_same<decltype(ptr1.swap(ptr2)), void>::value); |
| } |
| |
| { |
| Ptr ptr1(&obj1); |
| Ptr ptr2(&obj2); |
| |
| assert(ptr1.get() == &obj1); |
| assert(ptr2.get() == &obj2); |
| |
| std::experimental::swap(ptr1, ptr2); |
| |
| assert(ptr1.get() == &obj2); |
| assert(ptr2.get() == &obj1); |
| |
| static_assert(noexcept(std::experimental::swap(ptr1, ptr2))); |
| static_assert(std::is_same<decltype(std::experimental::swap(ptr1, ptr2)), void>::value); |
| } |
| } |
| |
| struct Bar {}; |
| |
| constexpr bool test() { |
| test_swap<Bar>(); |
| test_swap<int>(); |
| test_swap<void, int>(); |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |