1 /*=============================================================================
2     Copyright (c) 2001-2011 Joel de Guzman
3     Copyright (c) 2011 Eric Niebler
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_FIND_05052005_1107)
9 #define FUSION_FIND_05052005_1107
10 
11 #include <boost/fusion/support/config.hpp>
12 #include <boost/fusion/algorithm/query/find_if_fwd.hpp>
13 #include <boost/fusion/algorithm/query/detail/find_if.hpp>
14 #include <boost/fusion/algorithm/query/detail/segmented_find.hpp>
15 #include <boost/fusion/iterator/key_of.hpp>
16 #include <boost/fusion/iterator/value_of.hpp>
17 #include <boost/fusion/support/category_of.hpp>
18 #include <boost/fusion/support/is_segmented.hpp>
19 #include <boost/mpl/if.hpp>
20 #include <boost/mpl/placeholders.hpp>
21 #include <boost/type_traits/is_same.hpp>
22 #include <boost/type_traits/is_const.hpp>
23 #include <boost/utility/enable_if.hpp>
24 
25 namespace boost { namespace fusion
26 {
27     namespace result_of
28     {
29         template <typename Sequence, typename T>
30         struct find
31           : mpl::if_<
32                 traits::is_segmented<Sequence>
33               , detail::result_of_segmented_find<Sequence, T>
34               , detail::result_of_find_if<
35                     Sequence,
36                     is_same<
37                         typename mpl::if_<
38                             traits::is_associative<Sequence>
39                           , key_of<mpl::_1>
40                           , value_of<mpl::_1>
41                         >::type
42                       , T
43                     >
44                 >
45             >::type
46         {};
47     }
48 
49     template <typename T, typename Sequence>
50     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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(seq);
60     }
61 
62     template <typename T, typename Sequence>
63     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
64     inline typename result_of::find<Sequence const, T>::type const
find(Sequence const & seq)65     find(Sequence const& seq)
66     {
67         typedef typename result_of::find<Sequence const, T>::filter filter;
68         return filter::call(seq);
69     }
70 }}
71 
72 #endif
73