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 25using std::experimental::string_view; 26 27template <class T> 28void 29test() 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 47int 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