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/Src/Dependencies/Boost/boost/fusion/container/list/detail/deref_impl.hpp

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C++ Header | 52 lines | 36 code | 9 blank | 7 comment | 0 complexity | ddc665eb1ffa019733f2b6c826071e3b MD5 | raw file
 1/*=============================================================================
 2    Copyright (c) 2005 Joel de Guzman
 3    Copyright (c) 2005 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_DEREF_IMPL_07172005_0831)
 9#define FUSION_DEREF_IMPL_07172005_0831
10
11#include <boost/mpl/eval_if.hpp>
12#include <boost/type_traits/is_const.hpp>
13#include <boost/type_traits/add_const.hpp>
14#include <boost/type_traits/add_reference.hpp>
15
16namespace boost { namespace fusion
17{
18    struct cons_iterator_tag;
19
20    namespace extension
21    {
22        template <typename Tag>
23        struct deref_impl;
24
25        template <>
26        struct deref_impl<cons_iterator_tag>
27        {
28            template <typename Iterator>
29            struct apply 
30            {
31                typedef typename Iterator::cons_type cons_type;
32                typedef typename cons_type::car_type value_type;
33    
34                typedef typename mpl::eval_if<
35                    is_const<cons_type>
36                  , add_reference<typename add_const<value_type>::type>
37                  , add_reference<value_type> >::type
38                type;
39    
40                static type
41                call(Iterator const& i)
42                {
43                    return i.cons.car;
44                }
45            };
46        };
47    }
48}}
49
50#endif
51
52