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 // UNSUPPORTED: c++98, c++03, c++11 11 // <optional> 12 13 // template <class T> struct hash<optional<T>>; 14 15 #include <experimental/optional> 16 #include <string> 17 #include <memory> 18 #include <cassert> 19 20 21 int main() 22 { 23 using std::experimental::optional; 24 25 { 26 typedef int T; 27 optional<T> opt; 28 assert(std::hash<optional<T>>{}(opt) == 0); 29 opt = 2; 30 assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt)); 31 } 32 { 33 typedef std::string T; 34 optional<T> opt; 35 assert(std::hash<optional<T>>{}(opt) == 0); 36 opt = std::string("123"); 37 assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt)); 38 } 39 { 40 typedef std::unique_ptr<int> T; 41 optional<T> opt; 42 assert(std::hash<optional<T>>{}(opt) == 0); 43 opt = std::unique_ptr<int>(new int(3)); 44 assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt)); 45 } 46 } 47
