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