ceph/src/boost/libs/mpl/include/boost/mpl/zip_view.hpp

   1
   2 #ifndef BOOST_MPL_ZIP_VIEW_HPP_INCLUDED
   3 #define BOOST_MPL_ZIP_VIEW_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2010
   6 // Copyright David Abrahams 2000-2002
   7 //
   8 // Distributed under the Boost Software License, Version 1.0.
   9 // (See accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11 //
  12 // See http://www.boost.org/libs/mpl for documentation.
  13
  14 // $Id$
  15 // $Date$
  16 // $Revision$
  17
  18 #include <boost/mpl/transform.hpp>
  19 #include <boost/mpl/begin_end.hpp>
  20 #include <boost/mpl/iterator_tags.hpp>
  21 #include <boost/mpl/next.hpp>
  22 #include <boost/mpl/lambda.hpp>
  23 #include <boost/mpl/deref.hpp>
  24 #include <boost/mpl/aux_/na_spec.hpp>
  25
  26 namespace boost { namespace mpl {
  27
  28 template< typename IteratorSeq >
  29 struct zip_iterator
  30 {
  31     typedef forward_iterator_tag category;
  32     typedef typename transform1<
  33           IteratorSeq
  34         , deref<_1>
  35         >::type type;
  36
  37     typedef zip_iterator<
  38           typename transform1<
  39                 IteratorSeq
  40               , mpl::next<_1>
  41             >::type
  42         > next;
  43 };
  44
  45 template<
  46       typename BOOST_MPL_AUX_NA_PARAM(Sequences)
  47     >
  48 struct zip_view
  49 {
  50  private:
  51     typedef typename transform1< Sequences, mpl::begin<_1> >::type first_ones_;
  52     typedef typename transform1< Sequences, mpl::end<_1> >::type last_ones_;
  53
  54  public:
  55     typedef nested_begin_end_tag tag;
  56     typedef zip_view type;
  57     typedef zip_iterator<first_ones_> begin;
  58     typedef zip_iterator<last_ones_> end;
  59 };
  60
  61 BOOST_MPL_AUX_NA_SPEC(1, zip_view)
  62
  63 }}
  64
  65 #endif // BOOST_MPL_ZIP_VIEW_HPP_INCLUDED