| // -*- 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 observer_ptr(nullptr_t) noexcept; |
| |
| #include <experimental/memory> |
| #include <cassert> |
| #include <cstddef> |
| #include <type_traits> |
| |
| template <class T> |
| constexpr void test_nullptr_ctor() { |
| using Ptr = std::experimental::observer_ptr<T>; |
| Ptr ptr = nullptr; |
| assert(ptr.get() == nullptr); |
| static_assert(std::is_nothrow_constructible<Ptr, std::nullptr_t>::value); |
| } |
| |
| struct Foo; |
| struct Bar { |
| Bar(int) {} |
| }; |
| |
| constexpr bool test() { |
| test_nullptr_ctor<Foo>(); |
| test_nullptr_ctor<Bar>(); |
| test_nullptr_ctor<int>(); |
| test_nullptr_ctor<void>(); |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |