| //===----------------------------------------------------------------------===// |
| // |
| // 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> |
| |
| // constexpr const T& optional<T>::value() const &; |
| |
| #include <optional> |
| #include <type_traits> |
| #include <cassert> |
| |
| using std::optional; |
| |
| struct X |
| { |
| constexpr int test() const {return 3;} |
| int test() {return 4;} |
| }; |
| |
| int main() |
| { |
| { |
| constexpr optional<X> opt; |
| static_assert(opt.value().test() == 3, ""); |
| } |
| } |