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

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