1 /*============================================================================= 2 Copyright (c) 2001-2006 Joel de Guzman 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 #if !defined(FUSION_FIND_05052005_1107) 8 #define FUSION_FIND_05052005_1107 9 10 #include <boost/fusion/algorithm/query/detail/find_if.hpp> 11 #include <boost/fusion/sequence/intrinsic/begin.hpp> 12 #include <boost/fusion/sequence/intrinsic/end.hpp> 13 #include <boost/fusion/iterator/key_of.hpp> 14 #include <boost/fusion/iterator/value_of.hpp> 15 #include <boost/fusion/support/category_of.hpp> 16 #include <boost/mpl/if.hpp> 17 #include <boost/type_traits/is_same.hpp> 18 #include <boost/type_traits/is_const.hpp> 19 #include <boost/utility/enable_if.hpp> 20 21 namespace boost { namespace fusion 22 { 23 namespace result_of 24 { 25 template < 26 typename Sequence 27 , typename T 28 > 29 struct find 30 { 31 typedef 32 detail::static_find_if< 33 typename result_of::begin<Sequence>::type 34 , typename result_of::end<Sequence>::type 35 , is_same< 36 typename mpl::if_< 37 traits::is_associative<Sequence> 38 , key_of<mpl::_1> 39 , value_of<mpl::_1> 40 >::type 41 , T 42 > 43 > 44 filter; 45 46 typedef typename filter::type type; 47 }; 48 } 49 50 template <typename T, typename Sequence> 51 inline typename 52 lazy_disable_if< 53 is_const<Sequence> 54 , result_of::find<Sequence, T> 55 >::type const find(Sequence & seq)56 find(Sequence& seq) 57 { 58 typedef typename result_of::find<Sequence, T>::filter filter; 59 return filter::call(fusion::begin(seq)); 60 } 61 62 template <typename T, typename Sequence> 63 inline typename result_of::find<Sequence const, T>::type const find(Sequence const & seq)64 find(Sequence const& seq) 65 { 66 typedef typename result_of::find<Sequence const, T>::filter filter; 67 return filter::call(fusion::begin(seq)); 68 } 69 }} 70 71 #endif 72 73