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 25template <class T> 26void 27test() 28{ 29 typedef std::hash<T> H; 30 static_assert((std::is_same<typename H::argument_type, T>::value), "" ); 31 static_assert((std::is_same<typename H::result_type, std::size_t>::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 40int 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