1 2 #ifndef BOOST_MPL_FILTER_VIEW_HPP_INCLUDED 3 #define BOOST_MPL_FILTER_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/begin_end.hpp> 18 #include <boost/mpl/lambda.hpp> 19 #include <boost/mpl/aux_/filter_iter.hpp> 20 #include <boost/mpl/aux_/na_spec.hpp> 21 22 namespace boost { namespace mpl { 23 24 template< 25 typename BOOST_MPL_AUX_NA_PARAM(Sequence) 26 , typename BOOST_MPL_AUX_NA_PARAM(Predicate) 27 > 28 struct filter_view 29 { 30 private: 31 typedef typename lambda<Predicate>::type pred_; 32 typedef typename begin<Sequence>::type first_; 33 typedef typename end<Sequence>::type last_; 34 35 public: 36 struct tag; 37 typedef filter_view type; 38 typedef typename aux::next_filter_iter< first_,last_,pred_ >::type begin; 39 typedef aux::filter_iter< last_,last_,pred_ > end; 40 }; 41 42 BOOST_MPL_AUX_NA_SPEC(2, filter_view) 43 44 }} 45 46 #endif // BOOST_MPL_FILTER_VIEW_HPP_INCLUDED 47