3rdParty/Boost/src/boost/fusion/iterator/key_of.hpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

/*=============================================================================
    Copyright (c) 2009 Christopher Schmidt

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/

#ifndef BOOST_FUSION_ITERATOR_KEY_OF_HPP
#define BOOST_FUSION_ITERATOR_KEY_OF_HPP

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/tag_of.hpp>

namespace boost { namespace fusion
{
    struct iterator_facade_tag;

    namespace extension
    {
        template <typename>
        struct key_of_impl;

        template <>
        struct key_of_impl<iterator_facade_tag>
        {
            template <typename It>
            struct apply
              : It::template key_of<It>
            {};
        };
    }

    namespace result_of
    {
        template <typename It>
        struct key_of
          : extension::key_of_impl<typename traits::tag_of<It>::type>::
                template apply<It>
        {};
    }
}}

#endif