C++ (Cpp) CBitSet::FSubsetの例

コード例 #1

ファイル: CBitSetTest.cpp プロジェクト: RalphSu/gpos

//---------------------------------------------------------------------------
//	@function:
//		CBitSetTest::EresUnittest_SetOps
//
//	@doc:
//		Test for set operations
//
//---------------------------------------------------------------------------
GPOS_RESULT
CBitSetTest::EresUnittest_SetOps()
{
	// create memory pool
	CAutoMemoryPool amp;
	IMemoryPool *pmp = amp.Pmp();

	ULONG cSizeBits = 32;
	ULONG cInserts = 10;

	CBitSet *pbs1 = GPOS_NEW(pmp) CBitSet(pmp, cSizeBits);
	for (ULONG i = 0; i < cInserts; i += 2)
	{
		pbs1->FExchangeSet(i * cSizeBits);
	}

	CBitSet *pbs2 = GPOS_NEW(pmp) CBitSet(pmp, cSizeBits);
	for (ULONG i = 1; i < cInserts; i += 2)
	{
		pbs2->FExchangeSet(i * cSizeBits);
	}
	CBitSet *pbs = GPOS_NEW(pmp) CBitSet(pmp, cSizeBits);

	pbs->Union(pbs1);
	GPOS_ASSERT(pbs->FEqual(pbs1));

	pbs->Intersection(pbs1);
	GPOS_ASSERT(pbs->FEqual(pbs1));
	GPOS_ASSERT(pbs->FEqual(pbs));
	GPOS_ASSERT(pbs1->FEqual(pbs1));

	pbs->Union(pbs2);
	GPOS_ASSERT(!pbs->FEqual(pbs1) && !pbs->FEqual(pbs2));
	GPOS_ASSERT(pbs->FSubset(pbs1) && pbs->FSubset(pbs2));
	
	pbs->Difference(pbs2);
	GPOS_ASSERT(pbs->FEqual(pbs1));

	pbs1->Release();

	pbs->Union(pbs2);
	pbs->Intersection(pbs2);
	GPOS_ASSERT(pbs->FEqual(pbs2));
	GPOS_ASSERT(pbs->FSubset(pbs2));

	GPOS_ASSERT(pbs->CElements() == pbs2->CElements());

	pbs2->Release();

	pbs->Release();

	return GPOS_OK;
}

コード例 #2

ファイル: CJoinOrderDP.cpp プロジェクト: d/gporca

//---------------------------------------------------------------------------
//	@function:
//		CJoinOrderDP::PexprBuildPred
//
//	@doc:
//		Build predicate connecting the two given sets
//
//---------------------------------------------------------------------------
CExpression *
CJoinOrderDP::PexprBuildPred
	(
	CBitSet *pbsFst,
	CBitSet *pbsSnd
	)
{
	// collect edges connecting the given sets
	CBitSet *pbsEdges = GPOS_NEW(m_pmp) CBitSet(m_pmp);
	CBitSet *pbs = GPOS_NEW(m_pmp) CBitSet(m_pmp, *pbsFst);
	pbs->Union(pbsSnd);

	for (ULONG ul = 0; ul < m_ulEdges; ul++)
	{
		SEdge *pedge = m_rgpedge[ul];
		if (
			pbs->FSubset(pedge->m_pbs) &&
			!pbsFst->FDisjoint(pedge->m_pbs) &&
			!pbsSnd->FDisjoint(pedge->m_pbs)
			)
		{
#ifdef GPOS_DEBUG
		BOOL fSet =
#endif // GPOS_DEBUG
			pbsEdges->FExchangeSet(ul);
			GPOS_ASSERT(!fSet);
		}
	}
	pbs->Release();

	CExpression *pexprPred = NULL;
	if (0 < pbsEdges->CElements())
	{
		DrgPexpr *pdrgpexpr = GPOS_NEW(m_pmp) DrgPexpr(m_pmp);
		CBitSetIter bsi(*pbsEdges);
		while (bsi.FAdvance())
		{
			ULONG ul = bsi.UlBit();
			SEdge *pedge = m_rgpedge[ul];
			pedge->m_pexpr->AddRef();
			pdrgpexpr->Append(pedge->m_pexpr);
		}

		pexprPred = CPredicateUtils::PexprConjunction(m_pmp, pdrgpexpr);
	}

	pbsEdges->Release();
	return pexprPred;
}