1 /*============================================================================= 2 Copyright (c) 2001-2011 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/support/config.hpp> 12 #include <boost/fusion/view/filter_view/filter_view.hpp> 13 #include <boost/type_traits/is_same.hpp> 14 15 namespace boost { namespace fusion 16 { 17 namespace result_of 18 { 19 template <typename Sequence, typename T> 20 struct filter 21 { 22 typedef filter_view<Sequence, is_same<mpl::_, T> > type; 23 }; 24 } 25 26 template <typename T, typename Sequence> 27 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED 28 inline typename result_of::filter<Sequence const, T>::type filter(Sequence const & seq)29 filter(Sequence const& seq) 30 { 31 return filter_view<const Sequence, is_same<mpl::_, T> >(seq); 32 } 33 }} 34 35 #endif 36 37