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 
test()25 TEST_CONSTEXPR_CXX20 bool test()
26 {
27   {
28     const int i = 0;
29     std::reference_wrapper<const int> r1 = std::cref(i);
30     std::reference_wrapper<const int> r2 = std::cref(r1);
31     assert(&r2.get() == &i);
32   }
33   {
34     adl::A a;
35     std::reference_wrapper<const adl::A> a1 = std::cref(a);
36     std::reference_wrapper<const adl::A> a2 = std::cref(a1);
37     assert(&a2.get() == &a);
38   }
39   return true;
40 }
41 
main(int,char **)42 int main(int, char**)
43 {
44   test();
45 #if TEST_STD_VER > 17
46   static_assert(test());
47 #endif
48 
49   return 0;
50 }
51