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 |
97 | |