sl@0: 
sl@0: #ifndef BOOST_MPL_COPY_IF_HPP_INCLUDED
sl@0: #define BOOST_MPL_COPY_IF_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Aleksey Gurtovoy 2000-2004
sl@0: // Copyright David Abrahams 2003-2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/copy_if.hpp,v $
sl@0: // $Date: 2004/09/02 15:40:41 $
sl@0: // $Revision: 1.5 $
sl@0: 
sl@0: #include <boost/mpl/fold.hpp>
sl@0: #include <boost/mpl/reverse_fold.hpp>
sl@0: #include <boost/mpl/apply.hpp>
sl@0: #include <boost/mpl/eval_if.hpp>
sl@0: #include <boost/mpl/identity.hpp>
sl@0: #include <boost/mpl/protect.hpp>
sl@0: #include <boost/mpl/aux_/inserter_algorithm.hpp>
sl@0: #include <boost/mpl/aux_/config/forwarding.hpp>
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: namespace aux {
sl@0: 
sl@0: template<
sl@0:       typename Operation
sl@0:     , typename Predicate
sl@0:     >
sl@0: struct copy_if_op
sl@0: {
sl@0:     template< typename Sequence, typename T > struct apply
sl@0: #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
sl@0:         : eval_if<
sl@0:               typename apply1<Predicate,T>::type
sl@0:             , apply2<Operation,Sequence,T>
sl@0:             , identity<Sequence>
sl@0:             >
sl@0:     {
sl@0: #else
sl@0:     {
sl@0:         typedef typename eval_if<
sl@0:               typename apply1<Predicate,T>::type
sl@0:             , apply2<Operation,Sequence,T>
sl@0:             , identity<Sequence>
sl@0:             >::type type;
sl@0: #endif
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<
sl@0:       typename Sequence
sl@0:     , typename Predicate
sl@0:     , typename Inserter
sl@0:     >
sl@0: struct copy_if_impl
sl@0:     : fold<
sl@0:           Sequence
sl@0:         , typename Inserter::state
sl@0:         , protect< aux::copy_if_op<
sl@0:               typename Inserter::operation
sl@0:             , Predicate
sl@0:             > >
sl@0:         >
sl@0: {
sl@0: };
sl@0: 
sl@0: template<
sl@0:       typename Sequence
sl@0:     , typename Predicate
sl@0:     , typename Inserter
sl@0:     >
sl@0: struct reverse_copy_if_impl
sl@0:     : reverse_fold<
sl@0:           Sequence
sl@0:         , typename Inserter::state
sl@0:         , protect< aux::copy_if_op<
sl@0:               typename Inserter::operation
sl@0:             , Predicate
sl@0:             > >
sl@0:         >
sl@0: {
sl@0: };
sl@0: 
sl@0: } // namespace aux
sl@0: 
sl@0: BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, copy_if)
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_COPY_IF_HPP_INCLUDED