63e88f80
 Hu Chunming
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#ifndef BOOST_MPL_UNIQUE_HPP_INCLUDED
#define BOOST_MPL_UNIQUE_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2004
// Copyright John R. Bandela 2000-2002
//
// 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/fold.hpp>
#include <boost/mpl/reverse_fold.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/pair.hpp>
#include <boost/mpl/apply.hpp>
#include <boost/mpl/aux_/inserter_algorithm.hpp>
#include <boost/mpl/aux_/na.hpp>
#include <boost/mpl/aux_/na_spec.hpp>
#include <boost/mpl/aux_/lambda_spec.hpp>
namespace boost { namespace mpl {
namespace aux {
template< typename Predicate, typename Operation >
struct unique_op
{
template< typename Pair, typename T > struct apply
{
typedef typename Pair::first seq_;
typedef typename Pair::second prior_;
typedef typename eval_if<
and_< is_not_na<prior_>, apply2<Predicate,prior_,T> >
, identity<seq_>
, apply2<Operation,seq_,T>
>::type new_seq_;
typedef pair<new_seq_,T> type;
};
};
template<
typename Sequence
, typename Predicate
, typename Inserter
>
struct unique_impl
: first< typename fold<
Sequence
, pair< typename Inserter::state,na >
, protect< aux::unique_op<Predicate,typename Inserter::operation> >
>::type >
{
};
template<
typename Sequence
, typename Predicate
, typename Inserter
>
struct reverse_unique_impl
: first< typename reverse_fold<
Sequence
, pair< typename Inserter::state,na >
, protect< aux::unique_op<Predicate,typename Inserter::operation> >
>::type >
{
};
} // namespace aux
BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, unique)
}}
#endif // BOOST_MPL_UNIQUE_HPP_INCLUDED
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