public static int GetIndex(PDLPosComparisonOperator op)
        {
            switch (op)
            {
            case PDLPosComparisonOperator.Eq: return(0);

            case PDLPosComparisonOperator.Ge: return(1);

            case PDLPosComparisonOperator.Geq: return(2);

            case PDLPosComparisonOperator.Le: return(3);

            case PDLPosComparisonOperator.Leq: return(4);

            case PDLPosComparisonOperator.Succ: return(5);

            case PDLPosComparisonOperator.Pred: return(6);

            default: throw new PDLException("undefined operator");
            }
        }
 public static bool IsSymmetric(PDLPosComparisonOperator op)
 {
     return op == PDLPosComparisonOperator.Eq;
 }
 public static int GetIndex(PDLPosComparisonOperator op)
 {
     switch (op)
     {
         case PDLPosComparisonOperator.Eq: return 0;
         case PDLPosComparisonOperator.Ge: return 1;
         case PDLPosComparisonOperator.Geq: return 2;
         case PDLPosComparisonOperator.Le: return 3;
         case PDLPosComparisonOperator.Leq: return 4;
         case PDLPosComparisonOperator.Succ: return 5;
         case PDLPosComparisonOperator.Pred: return 6;
         default: throw new PDLException("undefined operator");
     }
 }
 public static bool IsSymmetric(PDLPosComparisonOperator op)
 {
     return(op == PDLPosComparisonOperator.Eq);
 }