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2 #ifndef BOOST_MPL_COPY_IF_HPP_INCLUDED
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3 #define BOOST_MPL_COPY_IF_HPP_INCLUDED
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4
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5 // Copyright Aleksey Gurtovoy 2000-2004
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6 // Copyright David Abrahams 2003-2004
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7 //
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8 // Distributed under the Boost Software License, Version 1.0.
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9 // (See accompanying file LICENSE_1_0.txt or copy at
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10 // http://www.boost.org/LICENSE_1_0.txt)
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11 //
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12 // See http://www.boost.org/libs/mpl for documentation.
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13
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14 // $Id$
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15 // $Date$
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16 // $Revision$
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17
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18 #include <boost/mpl/fold.hpp>
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19 #include <boost/mpl/reverse_fold.hpp>
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20 #include <boost/mpl/apply.hpp>
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21 #include <boost/mpl/eval_if.hpp>
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22 #include <boost/mpl/identity.hpp>
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23 #include <boost/mpl/protect.hpp>
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24 #include <boost/mpl/aux_/inserter_algorithm.hpp>
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25 #include <boost/mpl/aux_/config/forwarding.hpp>
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26
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27 namespace boost { namespace mpl {
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28
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29 namespace aux {
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30
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31 template<
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32 typename Operation
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33 , typename Predicate
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34 >
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35 struct copy_if_op
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36 {
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37 template< typename Sequence, typename T > struct apply
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38 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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39 : eval_if<
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40 typename apply1<Predicate,T>::type
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41 , apply2<Operation,Sequence,T>
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42 , identity<Sequence>
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43 >
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44 {
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45 #else
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46 {
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47 typedef typename eval_if<
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48 typename apply1<Predicate,T>::type
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49 , apply2<Operation,Sequence,T>
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50 , identity<Sequence>
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51 >::type type;
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52 #endif
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53 };
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54 };
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55
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56 template<
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57 typename Sequence
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58 , typename Predicate
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59 , typename Inserter
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60 >
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61 struct copy_if_impl
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62 : fold<
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63 Sequence
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64 , typename Inserter::state
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65 , protect< aux::copy_if_op<
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66 typename Inserter::operation
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67 , Predicate
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68 > >
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69 >
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70 {
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71 };
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72
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73 template<
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74 typename Sequence
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75 , typename Predicate
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76 , typename Inserter
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77 >
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78 struct reverse_copy_if_impl
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79 : reverse_fold<
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80 Sequence
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81 , typename Inserter::state
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82 , protect< aux::copy_if_op<
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83 typename Inserter::operation
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84 , Predicate
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85 > >
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86 >
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87 {
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88 };
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89
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90 } // namespace aux
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91
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92 BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, copy_if)
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93
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94 }}
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95
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96 #endif // BOOST_MPL_COPY_IF_HPP_INCLUDED
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