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 <experimental/string_view> 22 #include <cassert> 23 #include <type_traits> 24 25 using std::experimental::string_view; 26 27 template <class T> 28 void 29 test() 30 { 31 typedef std::hash<T> H; 32 static_assert((std::is_same<typename H::argument_type, T>::value), "" ); 33 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); 34 H h; 35 // std::string g1 = "1234567890"; 36 // std::string g2 = "1234567891"; 37 typedef typename T::value_type char_type; 38 char_type g1 [ 10 ]; 39 char_type g2 [ 10 ]; 40 for ( int i = 0; i < 10; ++i ) 41 g1[i] = g2[9-i] = '0' + i; 42 T s1(g1, 10); 43 T s2(g2, 10); 44 assert(h(s1) != h(s2)); 45 } 46 47 int main() 48 { 49 test<std::experimental::string_view>(); 50 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 51 test<std::experimental::u16string_view>(); 52 test<std::experimental::u32string_view>(); 53 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS 54 test<std::experimental::wstring_view>(); 55 } 56
