1 /*
2  *          Copyright Andrey Semashev 2007 - 2015.
3  * Distributed under the Boost Software License, Version 1.0.
4  *    (See accompanying file LICENSE_1_0.txt or copy at
5  *          http://www.boost.org/LICENSE_1_0.txt)
6  */
7 /*!
8  * \file   value_ref_visitation.hpp
9  * \author Andrey Semashev
10  * \date   28.07.2012
11  *
12  * \brief  This header is the Boost.Log library implementation, see the library documentation
13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. In this file
14  *         internal configuration macros are defined.
15  */
16 
17 #ifndef BOOST_LOG_DETAIL_VALUE_REF_VISITATION_HPP_INCLUDED_
18 #define BOOST_LOG_DETAIL_VALUE_REF_VISITATION_HPP_INCLUDED_
19 
20 #include <boost/mpl/at.hpp>
21 #include <boost/mpl/begin.hpp>
22 #include <boost/mpl/end.hpp>
23 #include <boost/mpl/advance.hpp>
24 #include <boost/mpl/erase.hpp>
25 #include <boost/mpl/size.hpp>
26 #include <boost/preprocessor/arithmetic/inc.hpp>
27 #include <boost/preprocessor/repetition/repeat_from_to.hpp>
28 #include <boost/preprocessor/iteration/iterate.hpp>
29 #include <boost/log/detail/config.hpp>
30 #include <boost/log/detail/header.hpp>
31 
32 #ifndef BOOST_LOG_VALUE_REF_VISITATION_UNROLL_COUNT
33 #define BOOST_LOG_VALUE_REF_VISITATION_UNROLL_COUNT 8
34 #endif
35 
36 namespace boost {
37 
38 BOOST_LOG_OPEN_NAMESPACE
39 
40 namespace aux {
41 
42 template< typename SequenceT, typename VisitorT, unsigned int SizeV = mpl::size< SequenceT >::value >
43 struct apply_visitor_dispatch
44 {
45     typedef typename VisitorT::result_type result_type;
46 
callboost::aux::apply_visitor_dispatch47     static BOOST_FORCEINLINE result_type call(const void* p, unsigned int type_index, VisitorT& visitor)
48     {
49         typedef typename mpl::begin< SequenceT >::type begin_type;
50         typedef typename mpl::advance_c< begin_type, SizeV / 2u >::type middle_type;
51         if (type_index < (SizeV / 2u))
52         {
53             typedef typename mpl::erase< SequenceT, middle_type, typename mpl::end< SequenceT >::type >::type new_sequence;
54             typedef apply_visitor_dispatch< new_sequence, VisitorT > new_dispatch;
55             return new_dispatch::call(p, type_index, visitor);
56         }
57         else
58         {
59             typedef typename mpl::erase< SequenceT, begin_type, middle_type >::type new_sequence;
60             typedef apply_visitor_dispatch< new_sequence, VisitorT > new_dispatch;
61             return new_dispatch::call(p, type_index - (SizeV / 2u), visitor);
62         }
63     }
64 };
65 
66 #define BOOST_LOG_AUX_CASE_ENTRY(z, i, data)\
67     case i: return visitor(*static_cast< typename mpl::at_c< SequenceT, i >::type const* >(p));
68 
69 #define BOOST_PP_FILENAME_1 <boost/log/detail/value_ref_visitation.hpp>
70 #define BOOST_PP_ITERATION_LIMITS (1, BOOST_PP_INC(BOOST_LOG_VALUE_REF_VISITATION_VTABLE_SIZE))
71 #include BOOST_PP_ITERATE()
72 
73 #undef BOOST_LOG_AUX_CASE_ENTRY
74 
75 } // namespace aux
76 
77 BOOST_LOG_CLOSE_NAMESPACE // namespace log
78 
79 } // namespace boost
80 
81 #include <boost/log/detail/footer.hpp>
82 
83 #endif // BOOST_LOG_DETAIL_VALUE_REF_VISITATION_HPP_INCLUDED_
84 
85 #ifdef BOOST_PP_IS_ITERATING
86 
87 #define BOOST_LOG_AUX_SWITCH_SIZE BOOST_PP_ITERATION()
88 
89 template< typename SequenceT, typename VisitorT >
90 struct apply_visitor_dispatch< SequenceT, VisitorT, BOOST_LOG_AUX_SWITCH_SIZE >
91 {
92     typedef typename VisitorT::result_type result_type;
93 
callapply_visitor_dispatch94     static BOOST_FORCEINLINE result_type call(const void* p, unsigned int type_index, VisitorT& visitor)
95     {
96         switch (type_index)
97         {
98         BOOST_PP_REPEAT_FROM_TO(1, BOOST_LOG_AUX_SWITCH_SIZE, BOOST_LOG_AUX_CASE_ENTRY, ~)
99         default:
100             return visitor(*static_cast< typename mpl::at_c< SequenceT, 0 >::type const* >(p));
101         }
102     }
103 };
104 
105 #undef BOOST_LOG_AUX_SWITCH_SIZE
106 
107 #endif // BOOST_PP_IS_ITERATING
108