source: NonGTP/Boost/boost/spirit/fusion/sequence/detail/generate.hpp @ 857

Revision 857, 2.8 KB checked in by igarcia, 19 years ago (diff)
Line 
1/*=============================================================================
2    Copyright (c) 2003 Joel de Guzman
3
4    Use, modification and distribution is subject to the Boost Software
5    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6    http://www.boost.org/LICENSE_1_0.txt)
7==============================================================================*/
8#if !defined(FUSION_SEQUENCE_DETAIL_GENERATE_HPP)
9#define FUSION_SEQUENCE_DETAIL_GENERATE_HPP
10
11#include <boost/spirit/fusion/sequence/tuple.hpp>
12#include <boost/spirit/fusion/iterator/value_of.hpp>
13#include <boost/spirit/fusion/iterator/next.hpp>
14#include <boost/spirit/fusion/iterator/equal_to.hpp>
15#include <boost/preprocessor/repetition/repeat.hpp>
16#include <boost/preprocessor/repetition/enum.hpp>
17#include <boost/preprocessor/arithmetic/inc.hpp>
18#include <boost/preprocessor/arithmetic/dec.hpp>
19#include <boost/mpl/eval_if.hpp>
20#include <boost/mpl/identity.hpp>
21
22#define FUSION_DEREF_ITERATOR(z, n, data)                                       \
23    typename checked_deref_iterator<                                            \
24        BOOST_PP_CAT(T, n), Last>::type
25
26#define FUSION_NEXT_ITERATOR(z, n, data)                                        \
27    typedef typename checked_next_iterator<                                     \
28        BOOST_PP_CAT(T, n), Last>::type                                         \
29    BOOST_PP_CAT(T, BOOST_PP_INC(n));
30
31namespace boost { namespace fusion { namespace detail
32{
33    template <typename First, typename Last>
34    struct checked_deref_iterator
35    {
36        typedef typename
37            mpl::eval_if<
38                meta::equal_to<First, Last>
39              , mpl::identity<void_t>
40              , meta::value_of<First>
41            >::type
42        type;
43    };
44
45    template <typename First, typename Last>
46    struct checked_next_iterator
47    {
48        typedef typename
49            mpl::eval_if<
50                meta::equal_to<First, Last>
51              , mpl::identity<Last>
52              , meta::next<First>
53            >::type
54        type;
55    };
56
57    template <typename First, typename Last>
58    struct result_of_generate
59    {
60        typedef First T0;
61        BOOST_PP_REPEAT(
62            BOOST_PP_DEC(FUSION_MAX_TUPLE_SIZE), FUSION_NEXT_ITERATOR, _)
63        typedef tuple<BOOST_PP_ENUM(FUSION_MAX_TUPLE_SIZE
64            , FUSION_DEREF_ITERATOR, _)> type;
65    };
66
67    template <typename First, typename Last>
68    inline typename result_of_generate<First, Last>::type
69    generate(First const& first, Last const&)
70    {
71        typedef typename result_of_generate<First, Last>::type result;
72        return result(first);
73    }
74}}}
75
76#undef FUSION_DEREF_ITERATOR
77#undef FUSION_NEXT_ITERATOR
78#endif
79
80
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