| //===----------------------------------------------------------------------===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <optional> |
| |
| // T& optional<T>::value(); |
| |
| #include <experimental/optional> |
| #include <type_traits> |
| #include <cassert> |
| |
| #if _LIBCPP_STD_VER > 11 |
| |
| using std::experimental::optional; |
| using std::experimental::bad_optional_access; |
| |
| struct X |
| { |
| X() = default; |
| X(const X&) = delete; |
| constexpr int test() const {return 3;} |
| int test() {return 4;} |
| }; |
| |
| #endif // _LIBCPP_STD_VER > 11 |
| |
| int main() |
| { |
| #if _LIBCPP_STD_VER > 11 |
| { |
| optional<X> opt; |
| opt.emplace(); |
| assert(opt.value().test() == 4); |
| } |
| { |
| optional<X> opt; |
| try |
| { |
| opt.value(); |
| assert(false); |
| } |
| catch (const bad_optional_access&) |
| { |
| } |
| } |
| #endif // _LIBCPP_STD_VER > 11 |
| } |