ceph/src/boost/libs/mpl/include/boost/mpl/copy_if.hpp

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