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 // : public unary_function<T, size_t> 16 // { 17 // size_t operator()(T val) const; 18 // }; 19 20 // Not very portable 21 22 #include <string_view> 23 #include <string> 24 #include <cassert> 25 #include <type_traits> 26 27 #include "test_macros.h" 28 29 using std::string_view; 30 31 template <class SV> 32 void 33 test() 34 { 35 typedef std::hash<SV> H; 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 39 typedef typename SV::value_type char_type; 40 typedef std::basic_string<char_type> String; 41 typedef std::hash<String> SH; 42 ASSERT_NOEXCEPT(H()(SV())); 43 44 char_type g1 [ 10 ]; 45 char_type g2 [ 10 ]; 46 for ( int i = 0; i < 10; ++i ) 47 g1[i] = g2[9-i] = static_cast<char_type>('0' + i); 48 H h; 49 SH sh; 50 SV s1(g1, 10); 51 String ss1(s1); 52 SV s2(g2, 10); 53 String ss2(s2); 54 assert(h(s1) == h(s1)); 55 assert(h(s1) != h(s2)); 56 assert(sh(ss1) == h(s1)); 57 assert(sh(ss2) == h(s2)); 58 } 59 60 int main(int, char**) 61 { 62 test<std::string_view>(); 63 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 64 test<std::u8string_view>(); 65 #endif 66 #ifndef TEST_HAS_NO_UNICODE_CHARS 67 test<std::u16string_view>(); 68 test<std::u32string_view>(); 69 #endif 70 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 71 test<std::wstring_view>(); 72 #endif 73 74 return 0; 75 } 76