//---------------------------------------------------------------------------
//	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(const CEnumSet &) = delete;

	// ctor
	explicit CEnumSet(CMemoryPool *mp)
		: CBitSet(mp, sentinel_index)
	{
	}

	explicit CEnumSet(
		CMemoryPool *mp, const CEnumSet &enum_set)
		: CBitSet(mp, enum_set)
	{
	}

	// dtor
	~CEnumSet() 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