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include/boost/mpl/aux_/iter_fold_if_impl.hpp
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210
include/boost/mpl/aux_/iter_fold_if_impl.hpp
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#ifndef BOOST_MPL_AUX_ITER_FOLD_IF_IMPL_HPP_INCLUDED
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#define BOOST_MPL_AUX_ITER_FOLD_IF_IMPL_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2001-2004
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// Copyright David Abrahams 2001-2002
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#if !defined(BOOST_MPL_PREPROCESSING_MODE)
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# include <boost/mpl/identity.hpp>
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# include <boost/mpl/next.hpp>
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# include <boost/mpl/if.hpp>
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# include <boost/mpl/apply.hpp>
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# include <boost/mpl/aux_/value_wknd.hpp>
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#endif
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#include <boost/mpl/aux_/config/use_preprocessed.hpp>
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#if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
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&& !defined(BOOST_MPL_PREPROCESSING_MODE)
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# define BOOST_MPL_PREPROCESSED_HEADER iter_fold_if_impl.hpp
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# include <boost/mpl/aux_/include_preprocessed.hpp>
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#else
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# include <boost/mpl/limits/unrolling.hpp>
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# include <boost/preprocessor/arithmetic/sub.hpp>
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# include <boost/preprocessor/repeat.hpp>
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# include <boost/preprocessor/inc.hpp>
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# include <boost/preprocessor/dec.hpp>
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# include <boost/preprocessor/cat.hpp>
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namespace boost { namespace mpl { namespace aux {
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template< typename Iterator, typename State >
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struct iter_fold_if_null_step
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{
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typedef State state;
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typedef Iterator iterator;
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};
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template< bool >
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struct iter_fold_if_step_impl
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{
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template<
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typename Iterator
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, typename State
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, typename StateOp
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, typename IteratorOp
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>
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struct result_
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{
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typedef typename apply2<StateOp,State,Iterator>::type state;
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typedef typename IteratorOp::type iterator;
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};
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};
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template<>
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struct iter_fold_if_step_impl<false>
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{
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template<
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typename Iterator
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, typename State
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, typename StateOp
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, typename IteratorOp
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>
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struct result_
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{
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typedef State state;
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typedef Iterator iterator;
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};
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};
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// agurt, 25/jun/02: MSVC 6.5 workaround, had to get rid of inheritance
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// here and in 'iter_fold_if_backward_step', because sometimes it interfered
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// with the "early template instantiation bug" in _really_ ugly ways
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template<
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typename Iterator
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, typename State
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, typename ForwardOp
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, typename Predicate
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>
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struct iter_fold_if_forward_step
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{
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typedef typename apply2<Predicate,State,Iterator>::type not_last;
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typedef typename iter_fold_if_step_impl<
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BOOST_MPL_AUX_MSVC_VALUE_WKND(not_last)::value
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>::template result_< Iterator,State,ForwardOp,mpl::next<Iterator> > impl_;
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typedef typename impl_::state state;
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typedef typename impl_::iterator iterator;
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};
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template<
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typename Iterator
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, typename State
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, typename BackwardOp
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, typename Predicate
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>
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struct iter_fold_if_backward_step
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{
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typedef typename apply2<Predicate,State,Iterator>::type not_last;
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typedef typename iter_fold_if_step_impl<
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BOOST_MPL_AUX_MSVC_VALUE_WKND(not_last)::value
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>::template result_< Iterator,State,BackwardOp,identity<Iterator> > impl_;
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typedef typename impl_::state state;
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typedef typename impl_::iterator iterator;
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};
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// local macros, #undef-ined at the end of the header
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# define AUX_ITER_FOLD_FORWARD_STEP(unused, i, unused2) \
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typedef iter_fold_if_forward_step< \
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typename BOOST_PP_CAT(forward_step,i)::iterator \
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, typename BOOST_PP_CAT(forward_step,i)::state \
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, ForwardOp \
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, ForwardPredicate \
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> BOOST_PP_CAT(forward_step, BOOST_PP_INC(i)); \
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/**/
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# define AUX_ITER_FOLD_BACKWARD_STEP_FUNC(i) \
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typedef iter_fold_if_backward_step< \
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typename BOOST_PP_CAT(forward_step,BOOST_PP_DEC(i))::iterator \
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, typename BOOST_PP_CAT(backward_step,i)::state \
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, BackwardOp \
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, BackwardPredicate \
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> BOOST_PP_CAT(backward_step,BOOST_PP_DEC(i)); \
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/**/
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# define AUX_ITER_FOLD_BACKWARD_STEP(unused, i, unused2) \
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AUX_ITER_FOLD_BACKWARD_STEP_FUNC( \
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BOOST_PP_SUB_D(1,BOOST_MPL_LIMIT_UNROLLING,i) \
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) \
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/**/
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# define AUX_LAST_FORWARD_STEP \
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BOOST_PP_CAT(forward_step, BOOST_MPL_LIMIT_UNROLLING) \
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/**/
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# define AUX_LAST_BACKWARD_STEP \
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BOOST_PP_CAT(backward_step, BOOST_MPL_LIMIT_UNROLLING) \
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/**/
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template<
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typename Iterator
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, typename State
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, typename ForwardOp
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, typename ForwardPredicate
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, typename BackwardOp
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, typename BackwardPredicate
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>
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struct iter_fold_if_impl
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{
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private:
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typedef iter_fold_if_null_step<Iterator,State> forward_step0;
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BOOST_PP_REPEAT(
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BOOST_MPL_LIMIT_UNROLLING
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, AUX_ITER_FOLD_FORWARD_STEP
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, unused
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)
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typedef typename if_<
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typename AUX_LAST_FORWARD_STEP::not_last
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, iter_fold_if_impl<
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typename AUX_LAST_FORWARD_STEP::iterator
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, typename AUX_LAST_FORWARD_STEP::state
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, ForwardOp
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, ForwardPredicate
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, BackwardOp
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, BackwardPredicate
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>
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, iter_fold_if_null_step<
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typename AUX_LAST_FORWARD_STEP::iterator
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, typename AUX_LAST_FORWARD_STEP::state
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>
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>::type AUX_LAST_BACKWARD_STEP;
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BOOST_PP_REPEAT(
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BOOST_MPL_LIMIT_UNROLLING
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, AUX_ITER_FOLD_BACKWARD_STEP
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, unused
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)
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public:
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typedef typename backward_step0::state state;
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typedef typename AUX_LAST_BACKWARD_STEP::iterator iterator;
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};
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# undef AUX_LAST_BACKWARD_STEP
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# undef AUX_LAST_FORWARD_STEP
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# undef AUX_ITER_FOLD_BACKWARD_STEP
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# undef AUX_ITER_FOLD_BACKWARD_STEP_FUNC
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# undef AUX_ITER_FOLD_FORWARD_STEP
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}}}
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#endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
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#endif // BOOST_MPL_AUX_ITER_FOLD_IF_IMPL_HPP_INCLUDED
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