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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 | // $Source: /cvsroot/boost/boost/boost/mpl/copy_if.hpp,v $ |
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| 15 | // $Date: 2004/09/02 15:40:41 $ |
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| 16 | // $Revision: 1.5 $ |
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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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