[857] | 1 | /*=============================================================================
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| 2 | Copyright (c) 2003 Joel de Guzman
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| 3 | Copyright (c) 2004 Peder Holt
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| 4 |
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| 5 | Use, modification and distribution is subject to the Boost Software
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| 6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 7 | http://www.boost.org/LICENSE_1_0.txt)
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| 8 | ==============================================================================*/
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| 9 | #if !defined(FUSION_ALGORITHM_REPLACE_HPP)
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| 10 | #define FUSION_ALGORITHM_REPLACE_HPP
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| 11 |
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| 12 | #include <boost/spirit/fusion/sequence/single_view.hpp>
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| 13 | #include <boost/spirit/fusion/sequence/joint_view.hpp>
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| 14 | #include <boost/spirit/fusion/sequence/range.hpp>
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| 15 | #include <boost/spirit/fusion/sequence/begin.hpp>
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| 16 | #include <boost/spirit/fusion/sequence/end.hpp>
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| 17 | #include <boost/spirit/fusion/iterator/equal_to.hpp>
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| 18 |
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| 19 | namespace boost { namespace fusion
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| 20 | {
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| 21 | namespace meta
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| 22 | {
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| 23 | template <typename Sequence, typename Position, typename T>
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| 24 | struct replace
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| 25 | {
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| 26 | typedef typename meta::begin<Sequence>::type first_type;
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| 27 | typedef typename meta::end<Sequence>::type last_type;
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| 28 | typedef typename meta::next<Position>::type next_type;
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| 29 | #if! BOOST_WORKAROUND(BOOST_MSVC,<=1300)
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| 30 | BOOST_STATIC_ASSERT((!meta::equal_to<Position, last_type>::value));
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| 31 | #endif
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| 32 | typedef single_view<T> insert_type;
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| 33 | typedef range<first_type, Position> left_type;
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| 34 | typedef range<next_type, last_type> right_type;
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| 35 | typedef joint_view<left_type, insert_type> left_replace_type;
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| 36 | typedef joint_view<left_replace_type, right_type> type;
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| 37 | };
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| 38 | }
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| 39 |
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| 40 | namespace function
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| 41 | {
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| 42 | struct replace
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| 43 | {
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| 44 | template <typename Sequence, typename Position, typename T>
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| 45 | struct apply : meta::replace<Sequence, Position, T> {};
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| 46 |
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| 47 | template <typename Sequence, typename Position, typename T>
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| 48 | typename apply<Sequence const, Position, T>::type
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| 49 | operator()(Sequence const& seq, Position const& pos, T const& x) const
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| 50 | {
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| 51 | typedef apply<Sequence const, Position, T> replacer;
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| 52 |
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| 53 | typedef typename replacer::left_type left_type;
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| 54 | typedef typename replacer::right_type right_type;
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| 55 | typedef typename replacer::left_replace_type left_replace_type;
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| 56 | typedef typename replacer::insert_type insert_type;
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| 57 | typedef typename replacer::type result;
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| 58 |
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| 59 | left_type left(fusion::begin(seq), pos);
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| 60 | right_type right(fusion::next(pos), fusion::end(seq));
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| 61 | insert_type ins(x);
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| 62 | left_replace_type left_replace(left, ins);
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| 63 | return result(left_replace, right);
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| 64 | }
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| 65 |
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| 66 | template <typename Sequence, typename Position, typename T>
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| 67 | typename apply<Sequence, Position, T>::type
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| 68 | operator()(Sequence& seq, Position const& pos, T const& x) const
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| 69 | {
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| 70 | typedef apply<Sequence, Position, T> replacer;
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| 71 |
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| 72 | typedef typename replacer::left_type left_type;
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| 73 | typedef typename replacer::right_type right_type;
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| 74 | typedef typename replacer::left_replace_type left_replace_type;
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| 75 | typedef typename replacer::insert_type insert_type;
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| 76 | typedef typename replacer::type result;
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| 77 |
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| 78 | left_type left(fusion::begin(seq), pos);
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| 79 | right_type right(fusion::next(pos), fusion::end(seq));
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| 80 | insert_type ins(x);
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| 81 | left_replace_type left_replace(left, ins);
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| 82 | return result(left_replace, right);
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| 83 | }
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| 84 | };
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| 85 | }
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| 86 |
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| 87 | function::replace const replace = function::replace();
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| 88 | }}
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| 89 |
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| 90 | #endif
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| 91 |
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