1 /*============================================================================= 2 Copyright (c) 2001-2006 Joel de Guzman 3 Copyright (c) 2005-2006 Dan Marsden 4 5 Distributed under the Boost Software License, Version 1.0. (See accompanying 6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 7 ==============================================================================*/ 8 #if !defined(FUSION_FILTER_02122005_1839) 9 #define FUSION_FILTER_02122005_1839 10 11 #include <boost/fusion/view/filter_view/filter_view.hpp> 12 #include <boost/type_traits/is_same.hpp> 13 14 namespace boost { namespace fusion 15 { 16 namespace result_of 17 { 18 template <typename Sequence, typename T> 19 struct filter 20 { 21 typedef filter_view<Sequence, is_same<mpl::_, T> > type; 22 }; 23 } 24 25 template <typename T, typename Sequence> 26 inline typename result_of::filter<Sequence const, T>::type filter(Sequence const & seq)27 filter(Sequence const& seq) 28 { 29 return filter_view<const Sequence, is_same<mpl::_, T> >(seq); 30 } 31 }} 32 33 #endif 34 35