// 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