72 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)10 11// <functional>12 13// template <class T>14// struct hash15// {16// size_t operator()(T val) const;17// };18 19// Not very portable20 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 <= 1434 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#endif37 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_T62 test<std::u8string_view>();63#endif64 test<std::u16string_view>();65 test<std::u32string_view>();66#ifndef TEST_HAS_NO_WIDE_CHARACTERS67 test<std::wstring_view>();68#endif69 70 return 0;71}72