| //===----------------------------------------------------------------------===// |
| // |
| // 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 optional |
| // { |
| // public: |
| // typedef T value_type; |
| // ... |
| |
| #include <optional> |
| #include <type_traits> |
| |
| using std::optional; |
| |
| template <class Opt, class T> |
| void |
| test() |
| { |
| static_assert(std::is_same<typename Opt::value_type, T>::value, ""); |
| } |
| |
| int main() |
| { |
| test<optional<int>, int>(); |
| test<optional<const int>, const int>(); |
| test<optional<double>, double>(); |
| test<optional<const double>, const double>(); |
| } |