1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14 10 // REQUIRES: c++experimental 11 12 // <experimental/memory> 13 14 // observer_ptr 15 // 16 // template <class T> struct hash<std::experimental::observer_ptr<T>>; 17 18 #include <experimental/memory> 19 #include <cassert> 20 #include <functional> 21 22 #include "poisoned_hash_helper.h" 23 24 template <class T, class Object = T> 25 void test_hash() { 26 { 27 using Ptr = std::experimental::observer_ptr<T>; 28 Object obj; 29 Ptr ptr(&obj); 30 31 std::hash<std::experimental::observer_ptr<T>> f; 32 std::size_t h = f(ptr); 33 34 assert(h == std::hash<T*>()(&obj)); 35 } 36 37 test_hash_enabled<std::experimental::observer_ptr<T>>(); 38 } 39 40 struct Bar {}; 41 42 void test() { 43 test_hash<void, int>(); 44 test_hash<int>(); 45 test_hash<Bar>(); 46 } 47 48 int main(int, char**) { 49 // Note: This isn't constexpr friendly in the spec! 50 test(); 51 52 return 0; 53 } 54