Memory leaks?

From: Giorgio De Nunzio <giorgio.denunzio_at_aliceposta.it>
Date: Wed, 24 Aug 2005 16:03:00 +0200

Hi all!
Another question for you kind gurus..
I do not understand what ROOT objects in a program should be deleted and what should not because they
already are implicitly.

Take, for example, guitest.C
I issued gObjectTable->Print() before .x guitest.C and after exiting it, and the object
counts differed, giving 5492 before, and 6523 after execution (I simply launched guitest, then I immediately exited calling no menu item etc).
Does this not mean menory leaks?

Another strange thing: start root (5.0.2 in my case) and give  gObjectTable->Print()
You obtain some value for total cts.
Call Print() again: you get (at least I do!) different figures; in particular I get 3045 the first time, 3151 the second time (and the following
ones). If I try it again (exit root, start it again, Print, Print), in general
these figures change.
Why??

OK, I said, I issue this command once, then I throw this result (perhaps ROOT
creates some objects the first time I issue a command), I Print again and use
the latter values to check my programs.

Now, try this one:
root
gObjectTable->Print() (I get cts = value1) .x basic.C
gObjectTable->Print() (I get cts = value2, far larger, of course) gObjectTable->Print() (I get cts = value3, lower than value2 but different from value1)
gObjectTable->Print() (from now on I get cts = value3)

Any explanation?

Another example, simply creating and destroying some objects:

Print() gives 3041
Print() again gives 3150
Print() again gives 3150  (stable, so begin experimenting)

TCanvas *c = new TCanvas

Print() gives 3791
Print() again gives 3834
Print() again gives 3834 (stable)

delete c
Print() gives 3558 (why not 3150?)
Print() again gives 3558 (this time it is immediately stable)

Another test (continuing the preceding one):

TCanvas *c = new TCanvas
..3837
..3838
..3838

delete c
..3561
..3561
..3561

And so on..
You can see that I cannot use gObjectTable->Print() to check if there are memory leaks.
Is it my problem or is there an explanation?

Another question (same sort of problems):

when I issue a command like

   mdiFrame->AddFrame(new TGTextButton(mdiFrame, new TGHotString("&Press me!"), 1),

                      new TGLayoutHints(kLHintsCenterX | kLHintsCenterY));

am I sure that all those "new" stuff are deleted when the frame is deleted? I cannot delete them by hand because they have no name..

Thanks!
Giorgio

---

Dr. Giorgio De Nunzio

Dipartimento di Scienza dei Materiali
Universita' di Lecce

tel. 0832 297545
fax 0832 297548

giorgio.denunzio_at_unile.it Received on Wed Aug 24 2005 - 16:08:06 MEST