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, c++14 11 // <optional> 12 13 // template <class T, class... Args> 14 // constexpr optional<T> make_optional(Args&&... args); 15 16 #include <optional> 17 #include <string> 18 #include <memory> 19 #include <cassert> 20 21 int main() 22 { 23 using std::optional; 24 using std::make_optional; 25 26 { 27 constexpr auto opt = make_optional<int>('a'); 28 static_assert(*opt == int('a'), ""); 29 } 30 { 31 std::string s("123"); 32 auto opt = make_optional<std::string>(s); 33 assert(*opt == s); 34 } 35 { 36 std::unique_ptr<int> s(new int(3)); 37 auto opt = make_optional<std::unique_ptr<int>>(std::move(s)); 38 assert(**opt == 3); 39 assert(s == nullptr); 40 } 41 { 42 auto opt = make_optional<std::string>(4, 'X'); 43 assert(*opt == "XXXX"); 44 } 45 } 46
