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#ifndef BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2004
//
// 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/front_fwd.hpp>
#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/aux_/traits_lambda_spec.hpp>
namespace boost { namespace mpl {
// default implementation; conrete sequences might override it by
// specializing either the 'front_impl' or the primary 'front' template
template< typename Tag >
struct front_impl
{
template< typename Sequence > struct apply
{
typedef typename begin<Sequence>::type iter_;
typedef typename deref<iter_>::type type;
};
};
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,front_impl)
}}
#endif // BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
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