greenplumn CBitSetIter 源码
greenplumn CBitSetIter 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/common/CBitSetIter.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CBitSetIter.h
//
// @doc:
// Implementation of iterator for bitset
//---------------------------------------------------------------------------
#ifndef GPOS_CBitSetIter_H
#define GPOS_CBitSetIter_H
#include "gpos/base.h"
#include "gpos/common/CBitSet.h"
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CBitSetIter
//
// @doc:
// Iterator for bitset's; defined as friend, ie can access bitset's
// internal links
//
//---------------------------------------------------------------------------
class CBitSetIter
{
private:
// bitset
const CBitSet &m_bs;
// current cursor position (in current link)
ULONG m_cursor;
// current cursor link
CBitSet::CBitSetLink *m_bsl;
// is iterator active or exhausted
BOOL m_active;
public:
CBitSetIter(const CBitSetIter &) = delete;
// ctor
explicit CBitSetIter(const CBitSet &bs);
// dtor
~CBitSetIter() = default;
// short hand for cast
operator BOOL() const
{
return m_active;
}
// move to next bit
BOOL Advance();
// current bit
ULONG Bit() const;
}; // class CBitSetIter
} // namespace gpos
#endif // !GPOS_CBitSetIter_H
// EOF
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