| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| // <optional> |
| |
| // template <class T, class... Args> |
| // constexpr optional<T> make_optional(Args&&... args); |
| |
| #include <optional> |
| #include <string> |
| #include <memory> |
| #include <cassert> |
| |
| int main() |
| { |
| using std::optional; |
| using std::make_optional; |
| |
| { |
| constexpr auto opt = make_optional<int>('a'); |
| static_assert(*opt == int('a'), ""); |
| } |
| { |
| std::string s("123"); |
| auto opt = make_optional<std::string>(s); |
| assert(*opt == s); |
| } |
| { |
| std::unique_ptr<int> s(new int(3)); |
| auto opt = make_optional<std::unique_ptr<int>>(std::move(s)); |
| assert(**opt == 3); |
| assert(s == nullptr); |
| } |
| { |
| auto opt = make_optional<std::string>(4, 'X'); |
| assert(*opt == "XXXX"); |
| } |
| } |