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// 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
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