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//===----------------------------------------------------------------------===//
//
// 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
//
// template <class W>
// std::experimental::observer_ptr<W> make_observer(W* p) noexcept;
#include <experimental/memory>
#include <cassert>
#include <type_traits>
template <class T, class Object = T>
void test_make_observer() {
using Ptr = std::experimental::observer_ptr<T>;
Object obj;
T* raw = &obj;
Ptr ptr = std::experimental::make_observer(raw);
assert(ptr.get() == raw);
static_assert(noexcept(std::experimental::make_observer(raw)));
static_assert(std::is_same<decltype(std::experimental::make_observer(raw)), Ptr>::value);
}
struct Bar {};
void test() {
test_make_observer<void, int>();
test_make_observer<int>();
test_make_observer<Bar>();
}
int main(int, char**) {
// Note: this is not constexpr in the spec
test();
return 0;
}
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