1 | |
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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: copy_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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15 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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16 | // $Revision: 49267 $ |
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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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