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> 14 // constexpr optional<decay_t<T>> make_optional(T&& v); 15 16 #include <optional> 17 #include <string> 18 #include <memory> 19 #include <cassert> 20 21 #include "test_macros.h" 22 main()23int main() 24 { 25 using std::optional; 26 using std::make_optional; 27 { 28 int arr[10]; ((void)arr); 29 ASSERT_SAME_TYPE(decltype(make_optional(arr)), optional<int*>); 30 } 31 { 32 constexpr auto opt = make_optional(2); 33 ASSERT_SAME_TYPE(decltype(opt), const optional<int>); 34 static_assert(opt.value() == 2); 35 } 36 { 37 optional<int> opt = make_optional(2); 38 assert(*opt == 2); 39 } 40 { 41 std::string s("123"); 42 optional<std::string> opt = make_optional(s); 43 assert(*opt == s); 44 } 45 { 46 std::unique_ptr<int> s(new int(3)); 47 optional<std::unique_ptr<int>> opt = make_optional(std::move(s)); 48 assert(**opt == 3); 49 assert(s == nullptr); 50 } 51 } 52