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 28 using std::string_view; 29 30 template <class SV> 31 void test()32test() 33 { 34 typedef std::hash<SV> H; 35 #if TEST_STD_VER <= 14 36 static_assert((std::is_same<typename H::argument_type, SV>::value), "" ); 37 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); 38 #endif 39 40 typedef typename SV::value_type char_type; 41 typedef std::basic_string<char_type> String; 42 typedef std::hash<String> SH; 43 ASSERT_NOEXCEPT(H()(SV())); 44 45 char_type g1 [ 10 ]; 46 char_type g2 [ 10 ]; 47 for ( int i = 0; i < 10; ++i ) 48 g1[i] = g2[9-i] = static_cast<char_type>('0' + i); 49 H h; 50 SH sh; 51 SV s1(g1, 10); 52 String ss1(s1); 53 SV s2(g2, 10); 54 String ss2(s2); 55 assert(h(s1) == h(s1)); 56 assert(h(s1) != h(s2)); 57 assert(sh(ss1) == h(s1)); 58 assert(sh(ss2) == h(s2)); 59 } 60 main(int,char **)61int main(int, char**) 62 { 63 test<std::string_view>(); 64 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 65 test<std::u8string_view>(); 66 #endif 67 test<std::u16string_view>(); 68 test<std::u32string_view>(); 69 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 70 test<std::wstring_view>(); 71 #endif 72 73 return 0; 74 } 75