greenplumn CEnumSet 源码
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
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