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
10
11// <propagate_const>
12
13// template <class T> struct hash<experimental::fundamentals_v2::propagate_const<T>>;
14
15#include <experimental/propagate_const>
16#include "test_macros.h"
17#include "propagate_const_helpers.h"
18#include <cassert>
19
20using std::experimental::propagate_const;
21
22namespace std {
23template <> struct hash<X>
24{
25 typedef X first_argument_type;
26
27 std::size_t operator()(const first_argument_type&) const
28 {
29 return 99;
30 }
31
32};
33} // namespace std
34
35int main(int, char**) {
36
37 typedef propagate_const<X> P;
38
39 P p(1);
40
41 auto h = std::hash<P>();
42
43 assert(h(p)==99);
44
45 return 0;
46}
47

source code of libcxx/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp