boost/mpl/joint_view.hpp

0001
0002 #ifndef BOOST_MPL_JOINT_VIEW_HPP_INCLUDED
0003 #define BOOST_MPL_JOINT_VIEW_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2000-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/aux_/joint_iter.hpp>
0018 #include <boost/mpl/plus.hpp>
0019 #include <boost/mpl/size_fwd.hpp>
0020 #include <boost/mpl/begin_end.hpp>
0021 #include <boost/mpl/aux_/na_spec.hpp>
0022
0023 namespace boost { namespace mpl {
0024
0025 namespace aux {
0026 struct joint_view_tag;
0027 }
0028
0029 template<>
0030 struct size_impl< aux::joint_view_tag >
0031 {
0032     template < typename JointView > struct apply
0033       : plus<
0034             size<typename JointView::sequence1_>
0035           , size<typename JointView::sequence2_>
0036           >
0037     {};
0038 };
0039
0040 template<
0041       typename BOOST_MPL_AUX_NA_PARAM(Sequence1_)
0042     , typename BOOST_MPL_AUX_NA_PARAM(Sequence2_)
0043     >
0044 struct joint_view
0045 {
0046     typedef typename mpl::begin<Sequence1_>::type   first1_;
0047     typedef typename mpl::end<Sequence1_>::type     last1_;
0048     typedef typename mpl::begin<Sequence2_>::type   first2_;
0049     typedef typename mpl::end<Sequence2_>::type     last2_;
0050
0051     // agurt, 25/may/03: for the 'size_traits' implementation above
0052     typedef Sequence1_ sequence1_;
0053     typedef Sequence2_ sequence2_;
0054
0055     typedef joint_view type;
0056     typedef aux::joint_view_tag tag;
0057     typedef joint_iter<first1_,last1_,first2_>  begin;
0058     typedef joint_iter<last1_,last1_,last2_>    end;
0059 };
0060
0061 BOOST_MPL_AUX_NA_SPEC(2, joint_view)
0062
0063 }}
0064
0065 #endif // BOOST_MPL_JOINT_VIEW_HPP_INCLUDED