#ifndef BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED #define BOOST_MPL_AUX_EMPTY_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: empty_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ // $Revision: 49267 $ #include <boost/mpl/empty_fwd.hpp> #include <boost/mpl/begin_end.hpp> #include <boost/mpl/aux_/traits_lambda_spec.hpp> #include <boost/type_traits/is_same.hpp> namespace boost { namespace mpl { // default implementation; conrete sequences might override it by // specializing either the 'empty_impl' or the primary 'empty' template template< typename Tag > struct empty_impl { template< typename Sequence > struct apply : is_same< typename begin<Sequence>::type , typename end<Sequence>::type > { }; }; BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,empty_impl) }} #endif // BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED