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// -*- 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;
}
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