Chris@16: // Copyright Daniel Wallin 2006. Use, modification and distribution is
Chris@16: // subject to the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP
Chris@16: # define BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP
Chris@16: 
Chris@16: # include <boost/mpl/and.hpp>
Chris@16: # include <boost/mpl/not.hpp>
Chris@16: # include <boost/type_traits/is_convertible.hpp>
Chris@16: # include <boost/type_traits/is_reference.hpp>
Chris@16: 
Chris@16: namespace boost { namespace parameter { 
Chris@16: 
Chris@16: namespace aux 
Chris@16: {
Chris@16: 
Chris@16:   struct template_keyword_tag {}; 
Chris@16: 
Chris@16:   template <class T, class U>
Chris@16:   struct is_pointer_convertible
Chris@16:     : is_convertible<T*, U*>
Chris@16:   {};
Chris@16: 
Chris@16:   template <class T>
Chris@16:   struct is_template_keyword
Chris@16:     : mpl::and_<
Chris@16:           mpl::not_<is_reference<T> >
Chris@16:         , is_pointer_convertible<T, template_keyword_tag>
Chris@16:       >
Chris@16:   {};
Chris@16: 
Chris@16: } // namespace aux
Chris@16: 
Chris@16: template <class Tag, class T>
Chris@16: struct template_keyword
Chris@16:   : aux::template_keyword_tag
Chris@16: {
Chris@16:     typedef Tag key_type;
Chris@16:     typedef T value_type;
Chris@16:     typedef value_type reference;
Chris@16: };
Chris@16: 
Chris@16: }} // namespace boost::parameter
Chris@16: 
Chris@16: #endif // BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP
Chris@16: