/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2005-2006 Dan Marsden

    Distributed under 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)
==============================================================================*/
#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_20060217_2141)
#define BOOST_FUSION_CATEGORY_OF_IMPL_20060217_2141

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/detail/mpl_iterator_category.hpp>
#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/is_sequence.hpp>
#include <boost/static_assert.hpp>

namespace boost {
namespace fusion {

namespace detail {
template <typename T>
struct mpl_sequence_category_of
{
    // assumes T is an mpl sequence
    // there should be no way this will ever be
    // called where T is an mpl iterator

    BOOST_STATIC_ASSERT(mpl::is_sequence<T>::value);
    typedef typename
    mpl_iterator_category<
    typename mpl::begin<T>::type::category
    >::type
    type;
};
}

struct mpl_sequence_tag;

namespace extension {
template<typename Tag>
struct category_of_impl;

template<>
struct category_of_impl<mpl_sequence_tag>
{
    template<typename T>
    struct apply
        : detail::mpl_sequence_category_of<T>
    {};
};
}
}
}

#endif
