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