1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10// UNSUPPORTED: c++03, c++11, c++14
11// REQUIRES: c++experimental
12
13// <experimental/memory>
14
15// observer_ptr
16//
17// constexpr observer_ptr() noexcept;
18
19#include <experimental/memory>
20#include <type_traits>
21#include <cassert>
22
23template <class T>
24constexpr void test_default_ctor() {
25 using Ptr = std::experimental::observer_ptr<T>;
26 Ptr ptr;
27 assert(ptr.get() == nullptr);
28 static_assert(std::is_nothrow_default_constructible<Ptr>::value);
29}
30
31struct Foo;
32struct Bar {
33 Bar(int) {}
34};
35
36constexpr bool test() {
37 test_default_ctor<Foo>();
38 test_default_ctor<Bar>();
39 test_default_ctor<int>();
40 test_default_ctor<void>();
41
42 return true;
43}
44
45int main(int, char**) {
46 test();
47 static_assert(test());
48
49 return 0;
50}
51

source code of libcxx/test/std/experimental/memory/memory.observer.ptr/ctor.default.pass.cpp