2010-07-26 17:06:36 +00:00
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// NO INCLUDE GUARDS, THE HEADER IS INTENDED FOR MULTIPLE INCLUSION!
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#if !defined(BOOST_PP_IS_ITERATING)
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// Copyright Aleksey Gurtovoy 2000-2004
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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: reverse_fold_impl_body.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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// $Revision: 49267 $
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# include <boost/mpl/limits/unrolling.hpp>
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# include <boost/mpl/aux_/preprocessor/repeat.hpp>
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# include <boost/mpl/aux_/config/ctps.hpp>
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# include <boost/mpl/aux_/nttp_decl.hpp>
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# include <boost/preprocessor/arithmetic/sub.hpp>
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# include <boost/preprocessor/iterate.hpp>
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# include <boost/preprocessor/dec.hpp>
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# include <boost/preprocessor/inc.hpp>
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# include <boost/preprocessor/cat.hpp>
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// local macros, #undef-ined at the end of the header
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# define AUX778076_ITER_FOLD_FORWARD_STEP(unused, n_, unused2) \
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typedef typename apply2< \
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ForwardOp \
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, BOOST_PP_CAT(fwd_state,n_) \
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, AUX778076_FOLD_IMPL_OP(BOOST_PP_CAT(iter,n_)) \
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>::type BOOST_PP_CAT(fwd_state,BOOST_PP_INC(n_)); \
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typedef typename mpl::next<BOOST_PP_CAT(iter,n_)>::type \
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BOOST_PP_CAT(iter,BOOST_PP_INC(n_)); \
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/**/
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# define AUX778076_ITER_FOLD_BACKWARD_STEP_FUNC(n_) \
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typedef typename apply2< \
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BackwardOp \
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, BOOST_PP_CAT(bkwd_state,n_) \
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, AUX778076_FOLD_IMPL_OP(BOOST_PP_CAT(iter,BOOST_PP_DEC(n_))) \
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>::type BOOST_PP_CAT(bkwd_state,BOOST_PP_DEC(n_)); \
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/**/
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# define AUX778076_ITER_FOLD_BACKWARD_STEP(unused, n_, j) \
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AUX778076_ITER_FOLD_BACKWARD_STEP_FUNC( \
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BOOST_PP_SUB_D(1,j,n_) \
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) \
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/**/
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# define AUX778076_FIRST_BACKWARD_STATE_TYPEDEF(n_) \
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typedef typename nested_chunk::state BOOST_PP_CAT(bkwd_state,n_);
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/**/
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# define AUX778076_FOLD_IMPL_NAME \
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BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_impl) \
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/**/
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# define AUX778076_FOLD_CHUNK_NAME \
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BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_chunk) \
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/**/
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namespace boost { namespace mpl { namespace aux {
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/// forward declaration
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template<
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BOOST_MPL_AUX_NTTP_DECL(long, N)
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, typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct AUX778076_FOLD_IMPL_NAME;
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
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&& !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC)
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# define BOOST_PP_ITERATION_PARAMS_1 \
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(3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/reverse_fold_impl_body.hpp>))
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# include BOOST_PP_ITERATE()
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// implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
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template<
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BOOST_MPL_AUX_NTTP_DECL(long, N)
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, typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct AUX778076_FOLD_IMPL_NAME
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{
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typedef First iter0;
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typedef State fwd_state0;
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BOOST_MPL_PP_REPEAT(
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BOOST_MPL_LIMIT_UNROLLING
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, AUX778076_ITER_FOLD_FORWARD_STEP
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, unused
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)
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typedef AUX778076_FOLD_IMPL_NAME<
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( (N - BOOST_MPL_LIMIT_UNROLLING) < 0 ? 0 : N - BOOST_MPL_LIMIT_UNROLLING )
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, BOOST_PP_CAT(iter,BOOST_MPL_LIMIT_UNROLLING)
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, Last
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, BOOST_PP_CAT(fwd_state,BOOST_MPL_LIMIT_UNROLLING)
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, BackwardOp
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, ForwardOp
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> nested_chunk;
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AUX778076_FIRST_BACKWARD_STATE_TYPEDEF(BOOST_MPL_LIMIT_UNROLLING)
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BOOST_MPL_PP_REPEAT(
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BOOST_MPL_LIMIT_UNROLLING
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, AUX778076_ITER_FOLD_BACKWARD_STEP
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, BOOST_MPL_LIMIT_UNROLLING
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)
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typedef bkwd_state0 state;
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typedef typename nested_chunk::iterator iterator;
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};
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// fallback implementation for sequences of unknown size
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct AUX778076_FOLD_IMPL_NAME<-1,First,Last,State,BackwardOp,ForwardOp>
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{
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typedef AUX778076_FOLD_IMPL_NAME<
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-1
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, typename mpl::next<First>::type
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, Last
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, typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type
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, BackwardOp
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, ForwardOp
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> nested_step;
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typedef typename apply2<
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BackwardOp
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, typename nested_step::state
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, AUX778076_FOLD_IMPL_OP(First)
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>::type state;
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typedef typename nested_step::iterator iterator;
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};
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template<
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typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct AUX778076_FOLD_IMPL_NAME<-1,Last,Last,State,BackwardOp,ForwardOp>
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{
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typedef State state;
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typedef Last iterator;
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};
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#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
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struct AUX778076_FOLD_CHUNK_NAME;
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# define BOOST_PP_ITERATION_PARAMS_1 \
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(3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/reverse_fold_impl_body.hpp>))
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# include BOOST_PP_ITERATE()
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// implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
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template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
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struct AUX778076_FOLD_CHUNK_NAME
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{
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct result_
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{
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typedef First iter0;
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typedef State fwd_state0;
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BOOST_MPL_PP_REPEAT(
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BOOST_MPL_LIMIT_UNROLLING
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, AUX778076_ITER_FOLD_FORWARD_STEP
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, unused
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)
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typedef AUX778076_FOLD_IMPL_NAME<
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( (N - BOOST_MPL_LIMIT_UNROLLING) < 0 ? 0 : N - BOOST_MPL_LIMIT_UNROLLING )
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, BOOST_PP_CAT(iter,BOOST_MPL_LIMIT_UNROLLING)
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, Last
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, BOOST_PP_CAT(fwd_state,BOOST_MPL_LIMIT_UNROLLING)
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, BackwardOp
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, ForwardOp
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> nested_chunk;
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AUX778076_FIRST_BACKWARD_STATE_TYPEDEF(BOOST_MPL_LIMIT_UNROLLING)
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BOOST_MPL_PP_REPEAT(
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BOOST_MPL_LIMIT_UNROLLING
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, AUX778076_ITER_FOLD_BACKWARD_STEP
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, BOOST_MPL_LIMIT_UNROLLING
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)
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typedef bkwd_state0 state;
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typedef typename nested_chunk::iterator iterator;
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};
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};
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// fallback implementation for sequences of unknown size
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step);
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template<
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typename Last
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, typename State
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>
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struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_null_step)
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{
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typedef Last iterator;
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typedef State state;
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};
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template<>
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struct AUX778076_FOLD_CHUNK_NAME<-1>
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{
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct result_
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{
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typedef typename if_<
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typename is_same<First,Last>::type
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, BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_null_step)<Last,State>
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, BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step)<First,Last,State,BackwardOp,ForwardOp>
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>::type res_;
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typedef typename res_::state state;
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typedef typename res_::iterator iterator;
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};
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#if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
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/// ETI workaround
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template<> struct result_<int,int,int,int,int>
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{
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typedef int state;
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typedef int iterator;
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};
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#endif
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};
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step)
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{
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typedef AUX778076_FOLD_CHUNK_NAME<-1>::template result_<
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typename mpl::next<First>::type
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, Last
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, typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type
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, BackwardOp
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, ForwardOp
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> nested_step;
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typedef typename apply2<
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BackwardOp
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, typename nested_step::state
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, AUX778076_FOLD_IMPL_OP(First)
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>::type state;
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typedef typename nested_step::iterator iterator;
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};
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template<
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BOOST_MPL_AUX_NTTP_DECL(long, N)
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, typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct AUX778076_FOLD_IMPL_NAME
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: AUX778076_FOLD_CHUNK_NAME<N>
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::template result_<First,Last,State,BackwardOp,ForwardOp>
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{
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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}}}
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# undef AUX778076_FIRST_BACKWARD_STATE_TYPEDEF
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# undef AUX778076_ITER_FOLD_BACKWARD_STEP
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# undef AUX778076_ITER_FOLD_BACKWARD_STEP_FUNC
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# undef AUX778076_ITER_FOLD_FORWARD_STEP
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#undef AUX778076_FOLD_IMPL_OP
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#undef AUX778076_FOLD_IMPL_NAME_PREFIX
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///// iteration
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#else
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# define n_ BOOST_PP_FRAME_ITERATION(1)
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
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&& !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC)
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct AUX778076_FOLD_IMPL_NAME<n_,First,Last,State,BackwardOp,ForwardOp>
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{
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typedef First iter0;
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typedef State fwd_state0;
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BOOST_MPL_PP_REPEAT(
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n_
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, AUX778076_ITER_FOLD_FORWARD_STEP
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, unused
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)
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typedef BOOST_PP_CAT(fwd_state,n_) BOOST_PP_CAT(bkwd_state,n_);
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BOOST_MPL_PP_REPEAT(
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n_
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, AUX778076_ITER_FOLD_BACKWARD_STEP
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, n_
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)
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typedef bkwd_state0 state;
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typedef BOOST_PP_CAT(iter,n_) iterator;
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};
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#else
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template<> struct AUX778076_FOLD_CHUNK_NAME<n_>
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{
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template<
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typename First
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, typename Last
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, typename State
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, typename BackwardOp
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, typename ForwardOp
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>
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struct result_
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{
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typedef First iter0;
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typedef State fwd_state0;
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BOOST_MPL_PP_REPEAT(
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n_
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, AUX778076_ITER_FOLD_FORWARD_STEP
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, unused
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)
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typedef BOOST_PP_CAT(fwd_state,n_) BOOST_PP_CAT(bkwd_state,n_);
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BOOST_MPL_PP_REPEAT(
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n_
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, AUX778076_ITER_FOLD_BACKWARD_STEP
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, n_
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)
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typedef bkwd_state0 state;
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typedef BOOST_PP_CAT(iter,n_) iterator;
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};
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#if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
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/// ETI workaround
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template<> struct result_<int,int,int,int,int>
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{
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typedef int state;
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typedef int iterator;
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};
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#endif
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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# undef n_
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#endif // BOOST_PP_IS_ITERATING
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