2 #ifndef BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED
3 #define BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED
5 // Copyright Aleksey Gurtovoy 2000-2004
7 // Distributed under the Boost Software License, Version 1.0.
8 // (See accompanying file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Source: /cvsroot/boost/boost/boost/mpl/aux_/empty_impl.hpp,v $
14 // $Date: 2004/09/02 15:40:43 $
17 #include <boost/mpl/empty_fwd.hpp>
18 #include <boost/mpl/begin_end.hpp>
19 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
20 #include <boost/type_traits/is_same.hpp>
22 namespace boost { namespace mpl {
24 // default implementation; conrete sequences might override it by
25 // specializing either the 'empty_impl' or the primary 'empty' template
27 template< typename Tag >
30 template< typename Sequence > struct apply
32 typename begin<Sequence>::type
33 , typename end<Sequence>::type
39 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,empty_impl)
43 #endif // BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED