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Copyright (c) 2008-2009: Joachim Faulhaber
   Distributed under the Boost Software License, Version 1.0.
      (See accompanying file LICENCE.txt or copy at

#include <boost/mpl/has_xxx.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/icl/type_traits/no_type.hpp>

namespace boost{ namespace icl
    namespace detail

    template <class Type>
    struct has_segment_type 
      : mpl::bool_<detail::has_segment_type<Type>::value>

    template <class Type, bool has_segment_type> 
    struct get_segment_type;

    template <class Type>
    struct get_segment_type<Type, false>
        typedef no_type type;

    template <class Type>
    struct get_segment_type<Type, true>
        typedef typename Type::segment_type type;

    template <class Type>
    struct segment_type_of
        typedef typename 
            get_segment_type<Type, has_segment_type<Type>::value>::type type;

}} // namespace boost icl