1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <functional> 11 12 // template <class T> 13 // struct hash 14 // : public unary_function<T, size_t> 15 // { 16 // size_t operator()(T val) const; 17 // }; 18 19 // Not very portable 20 21 #include <string> 22 #include <cassert> 23 #include <type_traits> 24 25 template <class T> 26 void 27 test() 28 { 29 typedef std::hash<T> H; 30 static_assert((std::is_base_of<std::unary_function<T, std::size_t>, 31 H>::value), ""); 32 H h; 33 std::string g1 = "1234567890"; 34 std::string g2 = "1234567891"; 35 T s1(g1.begin(), g1.end()); 36 T s2(g2.begin(), g2.end()); 37 assert(h(s1) != h(s2)); 38 } 39 40 int main() 41 { 42 test<std::string>(); 43 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 44 test<std::u16string>(); 45 test<std::u32string>(); 46 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS 47 test<std::wstring>(); 48 } 49
