Loop iterator - example.txt

[Derek Parnell]

On Sun, 30 Apr 2006 10:28:13 +1000, kris <foo at bar.com> wrote:

> Derek Parnell wrote:
>> On Sun, 30 Apr 2006 06:02:10 +1000, Bruno Medeiros   
>> <brunodomedeirosATgmail at SPAM.com> wrote:
>>
>>> In fact, the very idea seems like a very awkward idiom to me. I would   
>>> like to examine a real example, can someone post one?
>>   We use it in the area of retrying a database transaction after some  
>> sort  of exception condition has happened. It has nothing directly to  
>> do with  loop index maintenance.
>>  In pseudo-code ...
>>     foreach (inout Customer cust; CustomerSet )
>>    {
>>        try {
>>        cust.name = UI.CustName;
>>        cust.address = UI.Address;
>>        . . .
>>        }
>>        catch (BadUI e)
>>        {
>>            // Recover from the (rare) UI data error
>>            . . .
>>            retry; // Reprocess the same customer record.
>>        }
>>    }
>>
>
> Does that retry that instance, or retry the entire loop? Couldn't the  
> semantics be either, given the appropriate condition?

Just the instance and not the entire loop. There is a 'restart' key word  
to do the whole loop thing.


-- 
Derek Parnell
Melbourne, Australia