On 13. 02. 14 12:45, Radim Blazek wrote:
Thanks Denis,
However, do you have any idea where the point may be deleted? The
points are acquired from QgsGeometry.asPolyline() which returns
QVector<QgsPoint>, i.e. list of values. The points are then add to
another list: result.extend( pnts[1:-1] ). Is it wrong? The points get
deleted with original list?
I suppose you need to do a copy of your point in the result of the snapping.
do: point = QgsPoint( result[0].snappedVertex )
otherwise, result get out of scope at the end of the method and your point
is deleted.
1) does it mean that
point = result[0].snappedVertex
does not make a copy? It only creates Python wrapper object
referencing original C++ QgsSnappingResult.snappedVertex member?
yes
2) If a SIP wrapper class A has a member class B and an instance of A
is created in Python, B member is referenced and reference to A is
deleted is it the A instance deleted by GC including B (which is still
referenced)?
C++: class A { B b; }
SIP: class A { B b; }
Python:
a = A()
b = a.b
a = None
# garbage collector
a and b were deleted?
I would say yes too. But, I would ask confirmation to people more aware
than me. There should be some reading this ;)
Cheers,
Denis
Radim
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