[Qgis-developer] Reverse Changeset 13499

[Marco Hugentobler]

Or you use 'mutable' members for special cases. Lazy fetching is one of the 
few cases where mutable makes sense (even though I agree that it should be 
used with cautiousness).

Regards,
Marco  

Am Dienstag, 18. Mai 2010, um 07.15:19 schrieb Jürgen E. Fischer:
> Hi,
> 
> On Tue, 18. May 2010 at 06:50:59 +0200, Jürgen E. Fischer wrote:
> > > The reasoning behind the estimated metadata option is it only gets the
> > > table row count from the table statistics, regardless of any filters.
> > 
> > But that's wrong, when there is a where clause.
> 
> We could fetch the feature count only if we actually need it.  But that
> would require to change the API and drop the const from
> QgsVectorDataProvider::featureCount().
> 
> Any objections?
> 
> 
> Jürgen


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Webereistrasse 66, 8134 Adliswil, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee