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