boost/mpl/joint_view.hpp

   1
   2 #ifndef BOOST_MPL_JOINT_VIEW_HPP_INCLUDED
   3 #define BOOST_MPL_JOINT_VIEW_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   6 //
   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)
  10 //
  11 // See http://www.boost.org/libs/mpl for documentation.
  12
  13 // $Id$
  14 // $Date$
  15 // $Revision$
  16
  17 #include <boost/mpl/aux_/joint_iter.hpp>
  18 #include <boost/mpl/plus.hpp>
  19 #include <boost/mpl/size_fwd.hpp>
  20 #include <boost/mpl/begin_end.hpp>
  21 #include <boost/mpl/aux_/na_spec.hpp>
  22
  23 namespace boost { namespace mpl {
  24
  25 namespace aux {
  26 struct joint_view_tag;
  27 }
  28
  29 template<>
  30 struct size_impl< aux::joint_view_tag >
  31 {
  32     template < typename JointView > struct apply
  33       : plus<
  34             size<typename JointView::sequence1_>
  35           , size<typename JointView::sequence2_>
  36           >
  37     {};
  38 };
  39
  40 template<
  41       typename BOOST_MPL_AUX_NA_PARAM(Sequence1_)
  42     , typename BOOST_MPL_AUX_NA_PARAM(Sequence2_)
  43     >
  44 struct joint_view
  45 {
  46     typedef typename mpl::begin<Sequence1_>::type   first1_;
  47     typedef typename mpl::end<Sequence1_>::type     last1_;
  48     typedef typename mpl::begin<Sequence2_>::type   first2_;
  49     typedef typename mpl::end<Sequence2_>::type     last2_;
  50
  51     // agurt, 25/may/03: for the 'size_traits' implementation above
  52     typedef Sequence1_ sequence1_;
  53     typedef Sequence2_ sequence2_;
  54
  55     typedef joint_view type;
  56     typedef aux::joint_view_tag tag;
  57     typedef joint_iter<first1_,last1_,first2_>  begin;
  58     typedef joint_iter<last1_,last1_,last2_>    end;
  59 };
  60
  61 BOOST_MPL_AUX_NA_SPEC(2, joint_view)
  62
  63 }}
  64
  65 #endif // BOOST_MPL_JOINT_VIEW_HPP_INCLUDED