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1 | |
2 | #ifndef BOOST_MPL_COPY_IF_HPP_INCLUDED | |
3 | #define BOOST_MPL_COPY_IF_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/apply.hpp> | |
21 | #include <boost/mpl/eval_if.hpp> | |
22 | #include <boost/mpl/identity.hpp> | |
23 | #include <boost/mpl/protect.hpp> | |
24 | #include <boost/mpl/aux_/inserter_algorithm.hpp> | |
25 | #include <boost/mpl/aux_/config/forwarding.hpp> | |
26 | ||
27 | namespace boost { namespace mpl { | |
28 | ||
29 | namespace aux { | |
30 | ||
31 | template< | |
32 | typename Operation | |
33 | , typename Predicate | |
34 | > | |
35 | struct copy_if_op | |
36 | { | |
37 | template< typename Sequence, typename T > struct apply | |
38 | #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) | |
39 | : eval_if< | |
40 | typename apply1<Predicate,T>::type | |
41 | , apply2<Operation,Sequence,T> | |
42 | , identity<Sequence> | |
43 | > | |
44 | { | |
45 | #else | |
46 | { | |
47 | typedef typename eval_if< | |
48 | typename apply1<Predicate,T>::type | |
49 | , apply2<Operation,Sequence,T> | |
50 | , identity<Sequence> | |
51 | >::type type; | |
52 | #endif | |
53 | }; | |
54 | }; | |
55 | ||
56 | template< | |
57 | typename Sequence | |
58 | , typename Predicate | |
59 | , typename Inserter | |
60 | > | |
61 | struct copy_if_impl | |
62 | : fold< | |
63 | Sequence | |
64 | , typename Inserter::state | |
65 | , protect< aux::copy_if_op< | |
66 | typename Inserter::operation | |
67 | , Predicate | |
68 | > > | |
69 | > | |
70 | { | |
71 | }; | |
72 | ||
73 | template< | |
74 | typename Sequence | |
75 | , typename Predicate | |
76 | , typename Inserter | |
77 | > | |
78 | struct reverse_copy_if_impl | |
79 | : reverse_fold< | |
80 | Sequence | |
81 | , typename Inserter::state | |
82 | , protect< aux::copy_if_op< | |
83 | typename Inserter::operation | |
84 | , Predicate | |
85 | > > | |
86 | > | |
87 | { | |
88 | }; | |
89 | ||
90 | } // namespace aux | |
91 | ||
92 | BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, copy_if) | |
93 | ||
94 | }} | |
95 | ||
96 | #endif // BOOST_MPL_COPY_IF_HPP_INCLUDED |