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 <functional> 22 #include <cassert> 23 #include <type_traits> 24 #include <limits> 25 26 template <class T> 27 void test()28test() 29 { 30 typedef std::hash<T> H; 31 static_assert((std::is_same<typename H::argument_type, T>::value), "" ); 32 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); 33 H h; 34 35 for (int i = 0; i <= 5; ++i) 36 { 37 T t(i); 38 if (sizeof(T) <= sizeof(std::size_t)) 39 assert(h(t) == t); 40 } 41 } 42 main()43int main() 44 { 45 test<bool>(); 46 test<char>(); 47 test<signed char>(); 48 test<unsigned char>(); 49 test<char16_t>(); 50 test<char32_t>(); 51 test<wchar_t>(); 52 test<short>(); 53 test<unsigned short>(); 54 test<int>(); 55 test<unsigned int>(); 56 test<long>(); 57 test<unsigned long>(); 58 test<long long>(); 59 test<unsigned long long>(); 60 } 61