boost_mpl/include/boost/mpl/is_sequence.hpp

#ifndef BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
#define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2002-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.

// $Id$
// $Date$
// $Revision$

#include <boost/mpl/not.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/sequence_tag_fwd.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/void.hpp>
#include <boost/mpl/aux_/has_tag.hpp>
#include <boost/mpl/aux_/has_begin.hpp>
#include <boost/mpl/aux_/na_spec.hpp>
#include <boost/mpl/aux_/lambda_support.hpp>
#include <boost/mpl/aux_/config/msvc.hpp>
#include <boost/mpl/aux_/config/workaround.hpp>

#include <boost/type_traits/is_same.hpp>

namespace boost { namespace mpl {

#if defined(BOOST_MPL_CFG_NO_HAS_XXX)

template<
      typename BOOST_MPL_AUX_NA_PARAM(T)
    >
struct is_sequence
    : bool_<false>
{
};

#else

template<
      typename BOOST_MPL_AUX_NA_PARAM(T)
    >
struct is_sequence
    : not_< is_same< typename begin<T>::type, void_ > >
{
    BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T))
};

#endif // BOOST_MPL_CFG_NO_HAS_XXX


BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, is_sequence)

}}

#endif // BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED