algorithm/query/find.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001-2011 Joel de Guzman
0003     Copyright (c) 2011 Eric Niebler
0004
0005     Distributed under the Boost Software License, Version 1.0. (See accompanying
0006     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007 ==============================================================================*/
0008 #if !defined(FUSION_FIND_05052005_1107)
0009 #define FUSION_FIND_05052005_1107
0010
0011 #include <boost/fusion/support/config.hpp>
0012 #include <boost/fusion/algorithm/query/find_if_fwd.hpp>
0013 #include <boost/fusion/algorithm/query/detail/find_if.hpp>
0014 #include <boost/fusion/algorithm/query/detail/segmented_find.hpp>
0015 #include <boost/fusion/iterator/key_of.hpp>
0016 #include <boost/fusion/iterator/value_of.hpp>
0017 #include <boost/fusion/support/category_of.hpp>
0018 #include <boost/fusion/support/is_segmented.hpp>
0019 #include <boost/mpl/if.hpp>
0020 #include <boost/mpl/placeholders.hpp>
0021 #include <boost/type_traits/is_same.hpp>
0022 #include <boost/type_traits/is_const.hpp>
0023 #include <boost/utility/enable_if.hpp>
0024
0025 namespace boost { namespace fusion
0026 {
0027     namespace result_of
0028     {
0029         template <typename Sequence, typename T>
0030         struct find
0031           : mpl::if_<
0032                 traits::is_segmented<Sequence>
0033               , detail::result_of_segmented_find<Sequence, T>
0034               , detail::result_of_find_if<
0035                     Sequence,
0036                     is_same<
0037                         typename mpl::if_<
0038                             traits::is_associative<Sequence>
0039                           , key_of<mpl::_1>
0040                           , value_of<mpl::_1>
0041                         >::type
0042                       , T
0043                     >
0044                 >
0045             >::type
0046         {};
0047     }
0048
0049     template <typename T, typename Sequence>
0050     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0051     inline typename
0052         lazy_disable_if<
0053             is_const<Sequence>
0054           , result_of::find<Sequence, T>
0055         >::type const
0056     find(Sequence& seq)
0057     {
0058         typedef typename result_of::find<Sequence, T>::filter filter;
0059         return filter::call(seq);
0060     }
0061
0062     template <typename T, typename Sequence>
0063     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0064     inline typename result_of::find<Sequence const, T>::type const
0065     find(Sequence const& seq)
0066     {
0067         typedef typename result_of::find<Sequence const, T>::filter filter;
0068         return filter::call(seq);
0069     }
0070 }}
0071
0072 #endif