source: NonGTP/Boost/boost/spirit/fusion/algorithm/replace.hpp @ 857

Revision 857, 3.8 KB checked in by igarcia, 19 years ago (diff)
Line 
1/*=============================================================================
2    Copyright (c) 2003 Joel de Guzman
3    Copyright (c) 2004 Peder Holt
4
5    Use, modification and distribution is subject to the Boost Software
6    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
7    http://www.boost.org/LICENSE_1_0.txt)
8==============================================================================*/
9#if !defined(FUSION_ALGORITHM_REPLACE_HPP)
10#define FUSION_ALGORITHM_REPLACE_HPP
11
12#include <boost/spirit/fusion/sequence/single_view.hpp>
13#include <boost/spirit/fusion/sequence/joint_view.hpp>
14#include <boost/spirit/fusion/sequence/range.hpp>
15#include <boost/spirit/fusion/sequence/begin.hpp>
16#include <boost/spirit/fusion/sequence/end.hpp>
17#include <boost/spirit/fusion/iterator/equal_to.hpp>
18
19namespace boost { namespace fusion
20{
21    namespace meta
22    {
23        template <typename Sequence, typename Position, typename T>
24        struct replace
25        {
26            typedef typename meta::begin<Sequence>::type first_type;
27            typedef typename meta::end<Sequence>::type last_type;
28            typedef typename meta::next<Position>::type next_type;
29#if! BOOST_WORKAROUND(BOOST_MSVC,<=1300)
30            BOOST_STATIC_ASSERT((!meta::equal_to<Position, last_type>::value));
31#endif
32            typedef single_view<T> insert_type;
33            typedef range<first_type, Position> left_type;
34            typedef range<next_type, last_type> right_type;
35            typedef joint_view<left_type, insert_type> left_replace_type;
36            typedef joint_view<left_replace_type, right_type> type;
37        };
38    }
39
40    namespace function
41    {
42        struct replace
43        {
44            template <typename Sequence, typename Position, typename T>
45            struct apply : meta::replace<Sequence, Position, T> {};
46
47            template <typename Sequence, typename Position, typename T>
48            typename apply<Sequence const, Position, T>::type
49            operator()(Sequence const& seq, Position const& pos, T const& x) const
50            {
51                typedef apply<Sequence const, Position, T> replacer;
52
53                typedef typename replacer::left_type left_type;
54                typedef typename replacer::right_type right_type;
55                typedef typename replacer::left_replace_type left_replace_type;
56                typedef typename replacer::insert_type insert_type;
57                typedef typename replacer::type result;
58
59                left_type left(fusion::begin(seq), pos);
60                right_type right(fusion::next(pos), fusion::end(seq));
61                insert_type ins(x);
62                left_replace_type left_replace(left, ins);
63                return result(left_replace, right);
64            }
65
66            template <typename Sequence, typename Position, typename T>
67            typename apply<Sequence, Position, T>::type
68            operator()(Sequence& seq, Position const& pos, T const& x) const
69            {
70                typedef apply<Sequence, Position, T> replacer;
71
72                typedef typename replacer::left_type left_type;
73                typedef typename replacer::right_type right_type;
74                typedef typename replacer::left_replace_type left_replace_type;
75                typedef typename replacer::insert_type insert_type;
76                typedef typename replacer::type result;
77
78                left_type left(fusion::begin(seq), pos);
79                right_type right(fusion::next(pos), fusion::end(seq));
80                insert_type ins(x);
81                left_replace_type left_replace(left, ins);
82                return result(left_replace, right);
83            }
84        };
85    }
86
87    function::replace const replace = function::replace();
88}}
89
90#endif
91
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