| // Copyright Daniel Wallin 2006. 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_TEMPLATE_KEYWORD_060203_HPP |
| # define BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP |
| |
| # include <boost/mpl/and.hpp> |
| # include <boost/mpl/not.hpp> |
| # include <boost/type_traits/is_convertible.hpp> |
| # include <boost/type_traits/is_reference.hpp> |
| |
| namespace boost { namespace parameter { |
| |
| namespace aux |
| { |
| |
| struct template_keyword_tag {}; |
| |
| template <class T, class U> |
| struct is_pointer_convertible |
| : is_convertible<T*, U*> |
| {}; |
| |
| template <class T> |
| struct is_template_keyword |
| : mpl::and_< |
| mpl::not_<is_reference<T> > |
| , is_pointer_convertible<T, template_keyword_tag> |
| > |
| {}; |
| |
| } // namespace aux |
| |
| template <class Tag, class T> |
| struct template_keyword |
| : aux::template_keyword_tag |
| { |
| typedef Tag key_type; |
| typedef T value_type; |
| typedef value_type reference; |
| }; |
| |
| }} // namespace boost::parameter |
| |
| #endif // BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP |
| |