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: !stdlib=libc++ && (c++03 || c++11 || c++14)
10
11// <functional>
12
13// template <class T>
14// struct hash
15// {
16// size_t operator()(T val) const;
17// };
18
19// Not very portable
20
21#include <string_view>
22#include <string>
23#include <cassert>
24#include <type_traits>
25
26#include "test_macros.h"
27
28using std::string_view;
29
30template <class SV>
31void test() {
32 typedef std::hash<SV> H;
33#if TEST_STD_VER <= 14
34 static_assert((std::is_same<typename H::argument_type, SV>::value), "");
35 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "");
36#endif
37
38 typedef typename SV::value_type char_type;
39 typedef std::basic_string<char_type> String;
40 typedef std::hash<String> SH;
41 ASSERT_NOEXCEPT(H()(SV()));
42
43 char_type g1[10];
44 char_type g2[10];
45 for (int i = 0; i < 10; ++i)
46 g1[i] = g2[9 - i] = static_cast<char_type>('0' + i);
47 H h;
48 SH sh;
49 SV s1(g1, 10);
50 String ss1(s1);
51 SV s2(g2, 10);
52 String ss2(s2);
53 assert(h(s1) == h(s1));
54 assert(h(s1) != h(s2));
55 assert(sh(ss1) == h(s1));
56 assert(sh(ss2) == h(s2));
57}
58
59int main(int, char**) {
60 test<std::string_view>();
61#ifndef TEST_HAS_NO_CHAR8_T
62 test<std::u8string_view>();
63#endif
64 test<std::u16string_view>();
65 test<std::u32string_view>();
66#ifndef TEST_HAS_NO_WIDE_CHARACTERS
67 test<std::wstring_view>();
68#endif
69
70 return 0;
71}
72

source code of libcxx/test/std/strings/string.view/string.view.hash/string_view.pass.cpp