Hi,
I'm working with an event class which is very similar to the one in
$ROOTSYS/test/Event.h. In particular, it contains a TClonesArray* as a
member, equivalent to fTracks in the example.
The example uses a static TClonesArray* fgTracks to which fTracks
points to after the constructor Event::Event() is called.
Imagine we want to have, at the same time, two events with different
tracks in the TClonesArray. Par example, we analyse the event in two
different ways and this gives us different tracks, and want to keep the
two events for comparison. This won't be possible if the fTracks of both
events point to the same static fgTracks.
My real question is: what is the point of defining the static fgTracks
in the example, whereas having only fTracks seems enough for me. If
there's a reason to do so, when are we supposed to define "static copies"
of members?
Thank you!
Carlos MUÑOZ CAMACHO
SPhN/CEA-Saclay
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