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118 lines
3.0 KiB
118 lines
3.0 KiB
3 years ago
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#ifndef BOOST_MPL_ITER_FOLD_IF_HPP_INCLUDED
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#define BOOST_MPL_ITER_FOLD_IF_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2003-2004
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// Copyright Eric Friedman 2003
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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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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/logical.hpp>
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#include <boost/mpl/always.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/pair.hpp>
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#include <boost/mpl/apply.hpp>
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#include <boost/mpl/aux_/iter_fold_if_impl.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/mpl/aux_/config/forwarding.hpp>
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#include <boost/mpl/aux_/config/workaround.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost { namespace mpl {
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namespace aux {
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template< typename Predicate, typename LastIterator >
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struct iter_fold_if_pred
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{
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template< typename State, typename Iterator > struct apply
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#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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: and_<
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not_< is_same<Iterator,LastIterator> >
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, apply1<Predicate,Iterator>
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>
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{
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#else
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{
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typedef and_<
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not_< is_same<Iterator,LastIterator> >
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, apply1<Predicate,Iterator>
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> type;
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#endif
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};
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};
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} // namespace aux
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template<
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typename BOOST_MPL_AUX_NA_PARAM(Sequence)
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, typename BOOST_MPL_AUX_NA_PARAM(State)
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, typename BOOST_MPL_AUX_NA_PARAM(ForwardOp)
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, typename BOOST_MPL_AUX_NA_PARAM(ForwardPredicate)
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, typename BOOST_MPL_AUX_NA_PARAM(BackwardOp)
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, typename BOOST_MPL_AUX_NA_PARAM(BackwardPredicate)
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>
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struct iter_fold_if
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{
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typedef typename begin<Sequence>::type first_;
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typedef typename end<Sequence>::type last_;
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typedef typename eval_if<
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is_na<BackwardPredicate>
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, if_< is_na<BackwardOp>, always<false_>, always<true_> >
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, identity<BackwardPredicate>
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>::type backward_pred_;
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// cwpro8 doesn't like 'cut-off' type here (use typedef instead)
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#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) && !BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600))
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struct result_ :
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#else
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typedef
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#endif
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aux::iter_fold_if_impl<
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first_
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, State
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, ForwardOp
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, protect< aux::iter_fold_if_pred< ForwardPredicate,last_ > >
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, BackwardOp
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, backward_pred_
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>
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#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) && !BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600))
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{ };
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#else
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result_;
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#endif
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public:
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typedef pair<
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typename result_::state
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, typename result_::iterator
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> type;
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BOOST_MPL_AUX_LAMBDA_SUPPORT(
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6
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, iter_fold_if
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, (Sequence,State,ForwardOp,ForwardPredicate,BackwardOp,BackwardPredicate)
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)
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};
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BOOST_MPL_AUX_NA_SPEC(6, iter_fold_if)
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}}
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#endif // BOOST_MPL_ITER_FOLD_IF_HPP_INCLUDED
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