| // Copyright Daniel Wallin, David Abrahams 2010. Use, modification and |
| // distribution is subject to the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_PARAMETER_IS_MAYBE_050329_HPP |
| #define BOOST_PARAMETER_IS_MAYBE_050329_HPP |
| |
| #include <boost/type_traits/is_base_and_derived.hpp> |
| |
| namespace boost { |
| namespace parameter { |
| namespace aux { |
| |
| struct maybe_base {}; |
| |
| template <class T> |
| struct is_maybe |
| : is_base_and_derived<maybe_base, T> |
| {}; |
| |
| } // namespace aux |
| } // namespace parameter |
| } // namespace boost |
| |
| #endif // BOOST_PARAMETER_IS_MAYBE_050329_HPP |