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2 #ifndef BOOST_MPL_REMOVE_IF_HPP_INCLUDED
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3 #define BOOST_MPL_REMOVE_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/eval_if.hpp>
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21 #include <boost/mpl/identity.hpp>
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22 #include <boost/mpl/protect.hpp>
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23 #include <boost/mpl/lambda.hpp>
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24 #include <boost/mpl/apply.hpp>
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25 #include <boost/mpl/aux_/inserter_algorithm.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< typename Pred, typename InsertOp > struct remove_if_helper
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32 {
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33 template< typename Sequence, typename U > struct apply
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34 {
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35 typedef typename eval_if<
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36 typename apply1<Pred,U>::type
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37 , identity<Sequence>
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38 , apply2<InsertOp,Sequence,U>
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39 >::type type;
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40 };
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41 };
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42
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43 template<
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44 typename Sequence
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45 , typename Predicate
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46 , typename Inserter
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47 >
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48 struct remove_if_impl
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49 : fold<
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50 Sequence
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51 , typename Inserter::state
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52 , protect< aux::remove_if_helper<
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53 typename lambda<Predicate>::type
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54 , typename Inserter::operation
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55 > >
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56 >
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57 {
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58 };
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59
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60 template<
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61 typename Sequence
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62 , typename Predicate
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63 , typename Inserter
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64 >
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65 struct reverse_remove_if_impl
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66 : reverse_fold<
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67 Sequence
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68 , typename Inserter::state
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69 , protect< aux::remove_if_helper<
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70 typename lambda<Predicate>::type
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71 , typename Inserter::operation
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72 > >
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73 >
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74 {
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75 };
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76
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77 } // namespace aux
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78
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79 BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, remove_if)
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80
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81 }}
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82
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83 #endif // BOOST_MPL_REMOVE_IF_HPP_INCLUDED
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