2 #ifndef BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED
3 #define BOOST_MPL_AUX_BACK_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.
17 #include <boost/mpl/begin_end.hpp>
18 #include <boost/mpl/next_prior.hpp>
19 #include <boost/mpl/deref.hpp>
20 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
22 namespace boost { namespace mpl {
24 // default implementation, requires at least bi-directional iterators;
25 // conrete sequences might override it by specializing either the
26 // 'back_impl' or the primary 'back' template
28 template< typename Tag >
31 template< typename Sequence > struct apply
33 typedef typename end<Sequence>::type end_;
34 typedef typename prior<end_>::type last_;
35 typedef typename deref<last_>::type type;
39 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, back_impl)
43 #endif // BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED