Loop iterator - example.txt
kris
foo at bar.com
Sat Apr 29 19:09:48 PDT 2006
Derek Parnell wrote:
> 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.
>
>
Thanks; I had missed the 'restart';
- Kris
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