[Qgis-developer] QgsGeos creates continuously GEOSGeometry objects in QgsGeometry

[A Huarte]

Hi guys, QgsGeos class wraps the QgsGeometryEngine interface of a QgsAbstractGeometryV2 geometry. It is used massively for many spatial functions (IsGeosValid, contains, crosses, intersects....) in QgsGeometry.But testing perfomance I see that all operations create in QgsGeos a new GEOSGeometry instance from the current QgsGeometry object.It is a performance bottleneck (e.g. labeling), We can test....QgsGeometry a = ...
QgsGeometry b = ...

for (int  i = 0; i < 100; i++)
{
  bool contains = a.contains( &b );
}
The current code creates 200 GEOSGeometry objects.
I am right ? Is there one reason for this behavior?

I created a pull ( https://github.com/qgis/QGIS/pull/2859 ) for discussion or review. If I am wrong, my apologies, I delete the pull.
Thanks in advanceAlvaro
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