greenplumn CEnumSet 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/common/CEnumSet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CEnumSet.h
/
/ @doc:
/ Implementation of set of enums as bitset
/---------------------------------------------------------------------------
#ifndef GPOS_CEnumSet_H
#define GPOS_CEnumSet_H
#include "gpos/base.h"
#include "gpos/common/CBitSet.h"
namespace gpos
{
/---------------------------------------------------------------------------
/ @class:
/ CEnumSet
/
/ @doc:
/ Template derived from CBitSet
/
/---------------------------------------------------------------------------
template <class T, ULONG sentinel_index>
class CEnumSet : public CBitSet
{
private:
public:
CEnumSet<T, sentinel_index>(const CEnumSet<T, sentinel_index> &) = delete;
/ ctor
explicit CEnumSet<T, sentinel_index>(CMemoryPool *mp)
: CBitSet(mp, sentinel_index)
{
}
explicit CEnumSet<T, sentinel_index>(
CMemoryPool *mp, const CEnumSet<T, sentinel_index> &enum_set)
: CBitSet(mp, enum_set)
{
}
/ dtor
~CEnumSet<T, sentinel_index>() override = default;
/ determine if bit is set
BOOL
Get(T t) const
{
GPOS_ASSERT(t >= 0);
ULONG bit_index = static_cast<ULONG>(t);
GPOS_ASSERT(bit_index < sentinel_index && "Out of range of enum");
return CBitSet::Get(bit_index);
}
/ set given bit; return previous value
BOOL
ExchangeSet(T t)
{
GPOS_ASSERT(t >= 0);
ULONG bit_index = static_cast<ULONG>(t);
GPOS_ASSERT(bit_index < sentinel_index && "Out of range of enum");
return CBitSet::ExchangeSet(bit_index);
}
/ clear given bit; return previous value
BOOL
ExchangeClear(T t)
{
GPOS_ASSERT(t >= 0);
ULONG bit_index = static_cast<ULONG>(t);
GPOS_ASSERT(bit_index < sentinel_index && "Out of range of enum");
return CBitSet::ExchangeClear(bit_index);
}
}; / class CEnumSet
} / namespace gpos
#endif / !GPOS_CEnumSet_H
/ EOF