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
27namespace boost { namespace mpl {
28
29namespace aux {
30
31template<
32 typename Operation
33 , typename Predicate
34 >
35struct 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
56template<
57 typename Sequence
58 , typename Predicate
59 , typename Inserter
60 >
61struct 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
73template<
74 typename Sequence
75 , typename Predicate
76 , typename Inserter
77 >
78struct 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
92BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, copy_if)
93
94}}
95
96#endif // BOOST_MPL_COPY_IF_HPP_INCLUDED
97

source code of boost/libs/mpl/include/boost/mpl/copy_if.hpp