[gme-users] Ordering of sets in Bon

[Peter Volgyesi]

Hi,

Collections coming from the model database are never ordered. (This is a
property of our modeling engine and not BON specific, and it is because of
internal caching mechanisms.) One can argue, why don't we order these lists,
however it seems a better (general) approach to me to provide data as fast
as possible that can be sorted by the upper layers on demand.

Anyway, the MONTraverser interpreter (Paradigms/MetaGME folder) does
implement some kind of sorting (MONDialog.cpp). Feel free to use that code.

For retrieving graphical position of an object in a given aspect, use this:
fco->getRegistry()->getLocation("AspectName");

fco must be a BON FCO object (eg.: BON::Atom)

Regards, 

--
peter


> -----Original Message-----
> From: gme-users-bounces at list.isis.vanderbilt.edu 
> [mailto:gme-users-bounces at list.isis.vanderbilt.edu] On Behalf 
> Of Jacques Kerner
> Sent: Tuesday, April 06, 2004 9:45 AM
> To: A list for GME users to share thoughts and discuss bugs and fixes.
> Subject: [gme-users] Ordering of sets in Bon
> 
> Hi,
> 
> I would like to know how the std::set<...> returned by 
> BONExtender generated functions are ordered. For instance, I 
> have a model named "Container" that aggregates "Contained" 
> Atoms "contained1", "contained2" 
> and "contained3" and I was uable to figure out how the 
> ordering was made. Sometimes the order is by creation of the 
> contained elements, sometimes not, ...
> 
> Is there a way to impose the ordering on the returned sets ? 
> Do I have to define a specific operator < for this ? Could 
> BonExtender generate one from a rule in the meta model ?
> 
> I also wondered if one can retrieve the position of elements 
> in diagrams in BON .
> 
> Thank you in advance.
> 
> Jacques Kerner.
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