boost/mpl/filter_view.hpp

0001
0002 #ifndef BOOST_MPL_FILTER_VIEW_HPP_INCLUDED
0003 #define BOOST_MPL_FILTER_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/begin_end.hpp>
0018 #include <boost/mpl/lambda.hpp>
0019 #include <boost/mpl/aux_/filter_iter.hpp>
0020 #include <boost/mpl/aux_/na_spec.hpp>
0021
0022 namespace boost { namespace mpl {
0023
0024 template<
0025       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
0026     , typename BOOST_MPL_AUX_NA_PARAM(Predicate)
0027     >
0028 struct filter_view
0029 {
0030  private:
0031     typedef typename lambda<Predicate>::type pred_;
0032     typedef typename begin<Sequence>::type first_;
0033     typedef typename end<Sequence>::type last_;
0034
0035  public:
0036     struct tag;
0037     typedef filter_view type;
0038     typedef typename aux::next_filter_iter< first_,last_,pred_ >::type begin;
0039     typedef aux::filter_iter< last_,last_,pred_ > end;
0040 };
0041
0042 BOOST_MPL_AUX_NA_SPEC(2, filter_view)
0043
0044 }}
0045
0046 #endif // BOOST_MPL_FILTER_VIEW_HPP_INCLUDED