#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