Chris@16: // Copyright Daniel Wallin, David Abrahams 2010. Use, modification and
Chris@16: // distribution is subject to the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_PARAMETER_IS_MAYBE_050329_HPP
Chris@16: #define BOOST_PARAMETER_IS_MAYBE_050329_HPP
Chris@16: 
Chris@16: #include <boost/type_traits/is_base_and_derived.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace parameter {
Chris@16: namespace aux {
Chris@16: 
Chris@16: struct maybe_base {};
Chris@16: 
Chris@16: template <class T>
Chris@16: struct is_maybe
Chris@16:   : is_base_and_derived<maybe_base, T>
Chris@16: {};
Chris@16: 
Chris@16: } // namespace aux
Chris@16: } // namespace parameter
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_PARAMETER_IS_MAYBE_050329_HPP