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// template <class T>
12// struct hash
13// {
14// size_t operator()(T val) const;
15// };
16
17#include <bitset>
18#include <cassert>
19#include <type_traits>
20
21#include "test_macros.h"
22
23template <std::size_t N>
24void
25test()
26{
27 typedef std::bitset<N> T;
28 typedef std::hash<T> H;
29#if TEST_STD_VER <= 14
30 static_assert((std::is_same<typename H::argument_type, T>::value), "" );
31 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
32#endif
33 ASSERT_NOEXCEPT(H()(T()));
34
35 H h;
36 T bs(static_cast<unsigned long long>(N));
37 const std::size_t result = h(bs);
38 LIBCPP_ASSERT(result == N);
39 ((void)result); // Prevent unused warning
40}
41
42int main(int, char**)
43{
44 test<0>();
45 test<10>();
46 test<100>();
47 test<1000>();
48
49 return 0;
50}
51

source code of libcxx/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp