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 {}; |
22 | void cref(A) {} |
23 | } |
24 | |
25 | TEST_CONSTEXPR_CXX20 bool test() |
26 | { |
27 | { |
28 | const int i = 0; |
29 | std::reference_wrapper<const int> r1 = std::cref(t: i); |
30 | std::reference_wrapper<const int> r2 = std::cref(t: r1); |
31 | assert(&r2.get() == &i); |
32 | } |
33 | { |
34 | adl::A a; |
35 | std::reference_wrapper<const adl::A> a1 = std::cref(t: a); |
36 | std::reference_wrapper<const adl::A> a2 = std::cref(t: a1); |
37 | assert(&a2.get() == &a); |
38 | } |
39 | return true; |
40 | } |
41 | |
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 | |