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86 lines
2 KiB
C++
86 lines
2 KiB
C++
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#ifndef BOOST_MPL_UNIQUE_HPP_INCLUDED
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#define BOOST_MPL_UNIQUE_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2000-2004
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// Copyright John R. Bandela 2000-2002
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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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#include <boost/mpl/fold.hpp>
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#include <boost/mpl/reverse_fold.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/identity.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_/inserter_algorithm.hpp>
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#include <boost/mpl/aux_/na.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/lambda_spec.hpp>
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namespace boost { namespace mpl {
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namespace aux {
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template< typename Predicate, typename Operation >
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struct unique_op
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{
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template< typename Pair, typename T > struct apply
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{
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typedef typename Pair::first seq_;
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typedef typename Pair::second prior_;
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typedef typename eval_if<
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and_< is_not_na<prior_>, apply2<Predicate,prior_,T> >
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, identity<seq_>
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, apply2<Operation,seq_,T>
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>::type new_seq_;
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typedef pair<new_seq_,T> type;
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};
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};
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template<
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typename Sequence
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, typename Predicate
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, typename Inserter
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>
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struct unique_impl
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: first< typename fold<
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Sequence
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, pair< typename Inserter::state,na >
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, protect< aux::unique_op<Predicate,typename Inserter::operation> >
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>::type >
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{
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};
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template<
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typename Sequence
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, typename Predicate
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, typename Inserter
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>
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struct reverse_unique_impl
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: first< typename reverse_fold<
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Sequence
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, pair< typename Inserter::state,na >
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, protect< aux::unique_op<Predicate,typename Inserter::operation> >
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>::type >
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{
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};
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} // namespace aux
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BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, unique)
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}}
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#endif // BOOST_MPL_UNIQUE_HPP_INCLUDED
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