Hello,
I have troubles handling a TCanvas read from a file
when I use the newest ROOT version, v3.03.
Segmentation faults occur when I clear or delete the canvas.
This has not happened in using the older ROOT versions.
(I do not know how the file is created in detail.)
According to a release note, TPaveStats class is updated from v3.03.
So when I click one of two TPaveStats on the canvas by right mouse
button
and choose "Delete", then the segmentation fault shows up.
In the source code of v.303, the updated destructor contain a line:
if (!fParent->TestBit(kInvalidObject))
fParent->RecursiveRemove(this);
that the v.3.02 does not have.
I think the line should be
if ( fParent && !fParent->TestBit(kInvalidObject))
fParent->RecursiveRemove(this);
for stability. How do you think?
You could reproduce the phenomena:
{
gROOT->Reset();
TCanvas *c = new TCanvas( "c","canvas",500,500);
TPaveStats *stats = new TPaveStats(0.1,0.1,0.9,0.9);
stats->AddText("STATS");
stats->Draw();
stats->SetBit( kCanDelete );
}
Then test one of the following:
1. c->Delete(); or delete c;
2. c->Clear();
3. mouse right click on TPaveStats and choose Delete.
If you do the following, segmentation fault disappears.
stats->SetParent(c);
Regards
Tetsuo Arisawa
Waseda Univ. Japan / CDF
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