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, c++17 10 11 // <functional> 12 // 13 // reference_wrapper 14 // 15 // template <ObjectType T> reference_wrapper<T> ref(T& t); 16 // 17 // where T is an incomplete type (since C++20) 18 19 #include <functional> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 25 struct Foo; 26 27 Foo& get_foo(); 28 test()29void test() { 30 Foo& foo = get_foo(); 31 std::reference_wrapper<Foo> ref = std::ref(foo); 32 assert(&ref.get() == &foo); 33 } 34 35 struct Foo { }; 36 get_foo()37Foo& get_foo() { 38 static Foo foo; 39 return foo; 40 } 41 main(int,char **)42int main(int, char**) { 43 test(); 44 return 0; 45 } 46