iterator question.

[Tim Tautges]

Meaning, we haven't followed up in iGeom the changes to those concepts made in iMesh.

- tim

Tim Tautges wrote:
> I think in all cases, the iMesh interface should take precedent when 
> describing concepts common to that and iGeom.
> 
> - tim
> 
> Mark Shephard wrote:
>> Sounds like the iGeom iterator needs to be changed.
>>
>> Carl Ollivier-Gooch wrote:
>>> Jason Kraftcheck wrote:
>>>> Mark Shephard wrote:
>>>>> The Simmetrix people have been looking at the ITAPS iMesh, iMeshP, 
>>>>> iRel
>>>>> and iGeom interfaces.
>>>>>
>>>>> One of the questions they have sent us has to do with iterators and 
>>>>> is:
>>>>>
>>>>> "Are iMesh_getNextEntIter and iGeom_getNextEntIter supposed to have 
>>>>> the
>>>>> same behavior as their documentation describes two different 
>>>>> behaviors -
>>>>> iMesh_getNextEntIter indicates whether the current call returned data
>>>>> (which is fairly standard behavior for an 
>>>>> iterator),iGeom_getNextEntIter
>>>>> indicates whether the next call will return data (which is kind of odd
>>>>> behavior for an iterator)."
>>>>>
>>>>> I would think they should have the same behavior and the iMesh 
>>>>> behavior
>>>>> is the right one. Comments please.
>>>>>
>>>>
>>>> I think (if I correctly recall the that group discussion about this) 
>>>> that
>>>> the iMesh one is the correct one.  Returning information about next 
>>>> call, as
>>>> the iGeom one does, is not usable in mesh modification scenarios 
>>>> (consider
>>>> iterator at second to last entity when last entity is deleted.)
>>>
>>> Jason has identified precisely the reason that the iMesh iterator 
>>> behavior was changed.
>>>
>>> Carl
>>>
>>>
>>
>>
> 

-- 
================================================================
"You will keep in perfect peace him whose mind is
   steadfast, because he trusts in you."               Isaiah 26:3

              Tim Tautges            Argonne National Laboratory
          (tautges at mcs.anl.gov)      (telecommuting from UW-Madison)
          phone: (608) 263-8485      1500 Engineering Dr.
            fax: (608) 263-4499      Madison, WI 53706