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 // <functional> 10 11 // reference_wrapper 12 13 // template <ObjectType T> reference_wrapper<const T> cref(reference_wrapper<T> t); 14 15 #include <functional> 16 #include <cassert> 17 18 #include "test_macros.h" 19 20 namespace adl { 21 struct A {}; cref(A)22 void cref(A) {} 23 } 24 main(int,char **)25int main(int, char**) 26 { 27 const int i = 0; 28 std::reference_wrapper<const int> r1 = std::cref(i); 29 std::reference_wrapper<const int> r2 = std::cref(r1); 30 assert(&r2.get() == &i); 31 32 { 33 adl::A a; 34 std::reference_wrapper<const adl::A> a1 = std::cref(a); 35 std::reference_wrapper<const adl::A> a2 = std::cref(a1); 36 assert(&a2.get() == &a); 37 } 38 39 return 0; 40 } 41