1*4684ddb6SLionel Sambuc //===----------------------------------------------------------------------===// 2*4684ddb6SLionel Sambuc // 3*4684ddb6SLionel Sambuc // The LLVM Compiler Infrastructure 4*4684ddb6SLionel Sambuc // 5*4684ddb6SLionel Sambuc // This file is dual licensed under the MIT and the University of Illinois Open 6*4684ddb6SLionel Sambuc // Source Licenses. See LICENSE.TXT for details. 7*4684ddb6SLionel Sambuc // 8*4684ddb6SLionel Sambuc //===----------------------------------------------------------------------===// 9*4684ddb6SLionel Sambuc 10*4684ddb6SLionel Sambuc // <functional> 11*4684ddb6SLionel Sambuc 12*4684ddb6SLionel Sambuc // template <class T> 13*4684ddb6SLionel Sambuc // struct hash 14*4684ddb6SLionel Sambuc // : public unary_function<T, size_t> 15*4684ddb6SLionel Sambuc // { 16*4684ddb6SLionel Sambuc // size_t operator()(T val) const; 17*4684ddb6SLionel Sambuc // }; 18*4684ddb6SLionel Sambuc 19*4684ddb6SLionel Sambuc // Not very portable 20*4684ddb6SLionel Sambuc 21*4684ddb6SLionel Sambuc #include <string> 22*4684ddb6SLionel Sambuc #include <cassert> 23*4684ddb6SLionel Sambuc #include <type_traits> 24*4684ddb6SLionel Sambuc 25*4684ddb6SLionel Sambuc template <class T> 26*4684ddb6SLionel Sambuc void test()27*4684ddb6SLionel Sambuctest() 28*4684ddb6SLionel Sambuc { 29*4684ddb6SLionel Sambuc typedef std::hash<T> H; 30*4684ddb6SLionel Sambuc static_assert((std::is_base_of<std::unary_function<T, std::size_t>, 31*4684ddb6SLionel Sambuc H>::value), ""); 32*4684ddb6SLionel Sambuc H h; 33*4684ddb6SLionel Sambuc std::string g1 = "1234567890"; 34*4684ddb6SLionel Sambuc std::string g2 = "1234567891"; 35*4684ddb6SLionel Sambuc T s1(g1.begin(), g1.end()); 36*4684ddb6SLionel Sambuc T s2(g2.begin(), g2.end()); 37*4684ddb6SLionel Sambuc assert(h(s1) != h(s2)); 38*4684ddb6SLionel Sambuc } 39*4684ddb6SLionel Sambuc main()40*4684ddb6SLionel Sambucint main() 41*4684ddb6SLionel Sambuc { 42*4684ddb6SLionel Sambuc test<std::string>(); 43*4684ddb6SLionel Sambuc #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 44*4684ddb6SLionel Sambuc test<std::u16string>(); 45*4684ddb6SLionel Sambuc test<std::u32string>(); 46*4684ddb6SLionel Sambuc #endif // _LIBCPP_HAS_NO_UNICODE_CHARS 47*4684ddb6SLionel Sambuc test<std::wstring>(); 48*4684ddb6SLionel Sambuc } 49