public BQLOperatorHandle(DelOperatorHandle function, BQLValueItem[] parameters)
        {
            this.parameters = parameters;
            this.function   = function;


            //this.valueType = BQLValueType.Function;
        }
        internal override string DisplayValue(KeyWordInfomation info)
        {
            DelOperatorHandle degFHandle = function;

            if (degFHandle != null)
            {
                if (_priorityLevel > 0)
                {
                    return(degFHandle(this, info));
                }
                return("(" + degFHandle(this, info) + ")");
            }

            return(null);
        }