54 lines · cpp
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-exception7//8//===----------------------------------------------------------------------===//9 10// UNSUPPORTED: c++03, c++11, c++1411// REQUIRES: c++experimental12 13// <experimental/memory>14 15// observer_ptr16//17// constexpr element_type* release() noexcept;18 19#include <experimental/memory>20#include <type_traits>21#include <cassert>22 23template <class T, class Object = T>24constexpr void test_release() {25 Object obj;26 using Ptr = std::experimental::observer_ptr<T>;27 Ptr ptr(&obj);28 assert(ptr.get() == &obj);29 30 decltype(auto) r = ptr.release();31 assert(r == &obj);32 assert(ptr.get() == nullptr);33 34 static_assert(std::is_same<decltype(r), typename Ptr::element_type*>::value);35 static_assert(noexcept(ptr.release()));36}37 38struct Bar {};39 40constexpr bool test() {41 test_release<Bar>();42 test_release<int>();43 test_release<void, int>();44 45 return true;46}47 48int main(int, char**) {49 test();50 static_assert(test());51 52 return 0;53}54