RE: Question on Iterator model without having to setup a linked list

Thanks very much for the reply. In this case, can I get by without
setting up memory for the "next" pointer of the "<>head" provided by the
template ? What do I set my_data_context to ?
Does the following draft code look alright ? 

netsnmp_variable_list *
retailerTable_get_first_data_point(void **my_loop_context,
                          void **my_data_context,
                          netsnmp_variable_list *put_index_data,
                          netsnmp_iterator_info *mydata)
{
    netsnmp_variable_list *result;
    netsnmp_variable_list *idx = put_index_data;
    *my_loop_context = getRetailerDataEntry(0); // external interface
returns data, given an index
  

    result = retailerTable_get_next_data_point(my_loop_context,
 
my_data_context,
 
put_index_data,
                                                           mydata);
    if (result == NULL)
    {
        // what to do ?
    }
    return result;
}

netsnmp_variable_list *
retailerTable_get_next_data_point(void **my_loop_context,
                          void **my_data_context,
                          netsnmp_variable_list *put_index_data,
                          netsnmp_iterator_info *mydata)
{
 
    struct retailerTable_entry *entry;
    netsnmp_variable_list *idx = put_index_data;
    entry = (retailerTable_entry*)(*my_loop_context);

    if (entry)
    {
        snmp_set_var_typed_integer(idx, ASN_INTEGER,
                                   entry->retailerIndex); 
        idx = idx->next_variable;
        *my_data_context = //what should this be set to ?
        *my_loop_context = (void *) getRetailerDataEntry(
          entry->retailerIndex); // external interface returns data,
given an index
         return put_index_data;
    }
    else
    {
        *my_loop_context = //what should this be set to ?
        return NULL;
    }
}

Thanks,
viji
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of ext Dave Shield
Sent: Sunday, June 07, 2009 1:09 PM
To: Ranganathan, Viji (NSN - US/Boca Raton)
Cc: [email protected]
Subject: Re: Question on Iterator model without having to setup a linked
list

2009/6/5 Ranganathan, Viji (NSN - US/Boca Raton)
<[email protected]>:
> I am trying to implement a subagent that gets data from an external
data
> manager. This external data manager has it's own cache and it only
provides
> interfaces to get and set data.

Does it provide an interface for
   "given one row (index) - here's the next row (index)" ?

If so, then you can use that instead of walking the links of a list.
The linked-list code is purely there as an example - the iterator
handler doesn't care how you determine the "next row" index
information.

Dave

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