boost/fusion/view/repetitive_view/repetitive_view.hpp

   1 /*=============================================================================
   2     Copyright (c) 2007 Tobias Schwinger
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7
   8 #if !defined(BOOST_FUSION_REPETITIVE_REPETITIVE_VIEW_VIEW_HPP_INCLUDED)
   9 #define BOOST_FUSION_REPETITIVE_VIEW_REPETITIVE_VIEW_HPP_INCLUDED
  10
  11 #include <boost/type_traits/remove_reference.hpp>
  12 #include <boost/mpl/if.hpp>
  13
  14 #include <boost/fusion/support/is_view.hpp>
  15 #include <boost/fusion/support/category_of.hpp>
  16
  17 #include <boost/fusion/view/repetitive_view/detail/begin_impl.hpp>
  18 #include <boost/fusion/view/repetitive_view/detail/end_impl.hpp>
  19
  20
  21 namespace boost { namespace fusion
  22 {
  23     struct repetitive_view_tag;
  24     struct fusion_sequence_tag;
  25
  26     template<typename Sequence> struct repetitive_view
  27         : sequence_base< repetitive_view<Sequence> >
  28     {
  29         typedef repetitive_view_tag fusion_tag;
  30         typedef fusion_sequence_tag tag; // this gets picked up by MPL
  31         typedef mpl::true_ is_view;
  32
  33         typedef single_pass_traversal_tag category;
  34
  35         typedef typename boost::remove_reference<Sequence>::type sequence_type;
  36         typedef typename
  37             mpl::if_<traits::is_view<Sequence>, Sequence, sequence_type&>::type
  38         stored_seq_type;
  39
  40         repetitive_view(Sequence& seq)
  41             : seq(seq) {}
  42
  43         stored_seq_type seq;
  44     };
  45
  46 }}
  47
  48 #endif