Hello,
we are getting segmentation violation in the following situation:
we loop over the event object, containing the list, and if certain
conditions satisfied, we loop over the TList in the event using TIter.
If TIter happens to work just at the first cycle of the loop, it runs
without problems. Otherwise using next() ( TIter next(lst) ) causes
seg.vol. The simple macros below demonstrates this behaviour.
Are there any suggestions?
Best regards,
Ruben
void testnext(Int_t firstEv=2,Int_t threshold=2)
{
int lastEv = 5;
char strg[10];
for(int nev = firstEv; nev < lastEv; nev++){
printf("event %d\n",nev);
TList *lst = new TList();
sprintf(strg,"Ev#%d",nev);
lst->Add(new TNamed(strg,strg));
if (nev>=threshold ) {
printf("TList::Print produces: ");
lst->Print();
TIter next(lst);
TNamed* dig;
printf("Using TIter() produces: ");
while( (dig=(TNamed*)next()) ) {
dig->Print();
}
}
delete lst;
}
}
*******************************************
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* W E L C O M E to R O O T *
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* Version 3.02/07 14 February 2002 *
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Compiled for linux with thread support.
CINT/ROOT C/C++ Interpreter version 5.15.25, Jan 6 2002
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] .x testnext.C(2,2)
event 2
TList::Print produces: OBJ: TNamed Ev#2 Ev#2
Using TIter() produces: OBJ: TNamed Ev#2 Ev#2
event 3
TList::Print produces: OBJ: TNamed Ev#3 Ev#3
Using TIter() produces: OBJ: TNamed Ev#3 Ev#3
event 4
TList::Print produces: OBJ: TNamed Ev#4 Ev#4
Using TIter() produces: OBJ: TNamed Ev#4 Ev#4
root [1] .x testnext.C(1,2)
event 1
event 2
TList::Print produces: OBJ: TNamed Ev#2 Ev#2
Using TIter() produces:
*** Break *** segmentation violation
Root > Function testnext() busy flag cleared
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