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1 | |
2 | #ifndef BOOST_MPL_TRANSFORM_HPP_INCLUDED | |
3 | #define BOOST_MPL_TRANSFORM_HPP_INCLUDED | |
4 | ||
5 | // Copyright Aleksey Gurtovoy 2000-2004 | |
6 | // Copyright David Abrahams 2003-2004 | |
7 | // | |
8 | // Distributed under the Boost Software License, Version 1.0. | |
9 | // (See accompanying file LICENSE_1_0.txt or copy at | |
10 | // http://www.boost.org/LICENSE_1_0.txt) | |
11 | // | |
12 | // See http://www.boost.org/libs/mpl for documentation. | |
13 | ||
14 | // $Id$ | |
15 | // $Date$ | |
16 | // $Revision$ | |
17 | ||
18 | #include <boost/mpl/fold.hpp> | |
19 | #include <boost/mpl/reverse_fold.hpp> | |
20 | #include <boost/mpl/pair_view.hpp> | |
21 | #include <boost/mpl/is_sequence.hpp> | |
22 | #include <boost/mpl/eval_if.hpp> | |
23 | #include <boost/mpl/lambda.hpp> | |
24 | #include <boost/mpl/bind.hpp> | |
25 | #include <boost/mpl/or.hpp> | |
26 | #include <boost/mpl/not.hpp> | |
27 | #include <boost/mpl/aux_/na.hpp> | |
28 | #include <boost/mpl/aux_/inserter_algorithm.hpp> | |
29 | ||
30 | namespace boost { namespace mpl { | |
31 | ||
32 | namespace aux { | |
33 | ||
34 | template< | |
35 | typename Seq | |
36 | , typename Op | |
37 | , typename In | |
38 | > | |
39 | struct transform1_impl | |
40 | : fold< | |
41 | Seq | |
42 | , typename In::state | |
43 | , bind2< typename lambda< typename In::operation >::type | |
44 | , _1 | |
45 | , bind1< typename lambda<Op>::type, _2> | |
46 | > | |
47 | > | |
48 | { | |
49 | }; | |
50 | ||
51 | template< | |
52 | typename Seq | |
53 | , typename Op | |
54 | , typename In | |
55 | > | |
56 | struct reverse_transform1_impl | |
57 | : reverse_fold< | |
58 | Seq | |
59 | , typename In::state | |
60 | , bind2< typename lambda< typename In::operation >::type | |
61 | , _1 | |
62 | , bind1< typename lambda<Op>::type, _2> | |
63 | > | |
64 | > | |
65 | { | |
66 | }; | |
67 | ||
68 | template< | |
69 | typename Seq1 | |
70 | , typename Seq2 | |
71 | , typename Op | |
72 | , typename In | |
73 | > | |
74 | struct transform2_impl | |
75 | : fold< | |
76 | pair_view<Seq1,Seq2> | |
77 | , typename In::state | |
78 | , bind2< typename lambda< typename In::operation >::type | |
79 | , _1 | |
80 | , bind2< | |
81 | typename lambda<Op>::type | |
82 | , bind1<first<>,_2> | |
83 | , bind1<second<>,_2> | |
84 | > | |
85 | > | |
86 | > | |
87 | { | |
88 | }; | |
89 | ||
90 | template< | |
91 | typename Seq1 | |
92 | , typename Seq2 | |
93 | , typename Op | |
94 | , typename In | |
95 | > | |
96 | struct reverse_transform2_impl | |
97 | : reverse_fold< | |
98 | pair_view<Seq1,Seq2> | |
99 | , typename In::state | |
100 | , bind2< typename lambda< typename In::operation >::type | |
101 | , _1 | |
102 | , bind2< typename lambda< Op >::type | |
103 | , bind1<first<>,_2> | |
104 | , bind1<second<>,_2> | |
105 | > | |
106 | > | |
107 | > | |
108 | { | |
109 | }; | |
110 | ||
111 | } // namespace aux | |
112 | ||
113 | BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, transform1) | |
114 | BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(4, transform2) | |
115 | ||
116 | #define AUX778076_TRANSFORM_DEF(name) \ | |
117 | template< \ | |
118 | typename BOOST_MPL_AUX_NA_PARAM(Seq1) \ | |
119 | , typename BOOST_MPL_AUX_NA_PARAM(Seq2OrOperation) \ | |
120 | , typename BOOST_MPL_AUX_NA_PARAM(OperationOrInserter) \ | |
121 | , typename BOOST_MPL_AUX_NA_PARAM(Inserter) \ | |
122 | > \ | |
123 | struct name \ | |
124 | { \ | |
125 | typedef typename eval_if< \ | |
126 | or_< \ | |
127 | is_na<OperationOrInserter> \ | |
128 | , is_lambda_expression< Seq2OrOperation > \ | |
129 | , not_< is_sequence<Seq2OrOperation> > \ | |
130 | > \ | |
131 | , name##1<Seq1,Seq2OrOperation,OperationOrInserter> \ | |
132 | , name##2<Seq1,Seq2OrOperation,OperationOrInserter,Inserter> \ | |
133 | >::type type; \ | |
134 | }; \ | |
135 | BOOST_MPL_AUX_NA_SPEC(4, name) \ | |
136 | /**/ | |
137 | ||
138 | AUX778076_TRANSFORM_DEF(transform) | |
139 | AUX778076_TRANSFORM_DEF(reverse_transform) | |
140 | ||
141 | #undef AUX778076_TRANSFORM_DEF | |
142 | ||
143 | }} | |
144 | ||
145 | #endif // BOOST_MPL_TRANSFORM_HPP_INCLUDED |