AcDbEdgeRef::AcDbEdgeRef(AcDbCompoundObjectId&, AcDbSubentId&, AcDbSubentId&, AcGeCurve3d*) Constructor   

explicit AcDbEdgeRef(
    const AcDbCompoundObjectId&, 
    const AcDbSubentId& edgeSubentId = kNullSubentId, 
    const AcDbSubentId& faceSubentId = kNullSubentId, 
    const AcGeCurve3d* pCurve = NULL
);