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 // Not very portable 18 19 #include <string> 20 #include <cassert> 21 #include <type_traits> 22 23 #include "test_macros.h" 24 25 template <class T> test()26void test() { 27 typedef std::hash<T> H; 28 #if TEST_STD_VER <= 14 29 static_assert((std::is_same<typename H::argument_type, T>::value), ""); 30 static_assert((std::is_same<typename H::result_type, std::size_t>::value), ""); 31 #endif 32 ASSERT_NOEXCEPT(H()(T())); 33 34 H h; 35 std::string g1 = "1234567890"; 36 std::string g2 = "1234567891"; 37 T s1(g1.begin(), g1.end()); 38 T s2(g2.begin(), g2.end()); 39 assert(h(s1) != h(s2)); 40 } 41 main(int,char **)42int main(int, char**) { 43 test<std::string>(); 44 #ifndef TEST_HAS_NO_CHAR8_T 45 test<std::u8string>(); 46 #endif 47 test<std::u16string>(); 48 test<std::u32string>(); 49 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 50 test<std::wstring>(); 51 #endif 52 53 return 0; 54 } 55