Bike.Interpreter.Interpreter.OpPlus C# (CSharp) Метод

        public object OpPlus(object value)
        {
            if (value == null)
                throw ErrorFactory.CreateTypeError( "Invalid operand type: 'null'");
            if (value is BikeNumber)
                return value;
            throw ErrorFactory.CreateTypeError(string.Format("Invalid operand type: +{0}", value));
        }