[ROOT] TClonesArray::RemoveAt(Int_t idx)

From: Chris Jillings (jillings@caltech.edu)
Date: Wed Jul 02 2003 - 18:33:16 MEST 

Hi,
     I have a question concerning the use of
TClonesArray::RemoveAt(Int_t idx)

     I have a TClonesArray of hits which may contain information that 
exists somewhere else. I want to remove the hit from a list if I have I 
do indeed have the information somewhere else.
     In the line below where I have indicated problem here, I keep 
finding the same thing again and again, even if it has been removed from 
the list. I went to the source and didn't see that the fCont array was 
reindexed.
     The strange thing is when I put in the Dump on the TClonesArray, th 
dump reported the proper items.

     I am running on RedHat with the  2.4.20-18.7 kernel i686 with Root 
Version   3.04/02  18 December 2002

Thanks,

Chris

   TClonesArray* fHit = // filled somewhere else
   int i;	
   CHit* ct = // something obtained somewhere else.		
   CHit* hit;
   int duplicateIndex;
   if( ct!=NULL ) {
     do {
       duplicateIndex = -1;
       for( i=0 ; i<fNhit ; i++ ) {
	hit = (CHit*)((*fHit)[i]);   // PROBLEM HERE !!!!
	if( (*hit)==(*ct) ) {
	  duplicateIndex = i;
	  break;
	}
       }
       if( duplicateIndex>=0 ) {
	fHit->Dump();
	fHit->RemoveAt(duplicateIndex);
	fHit->Dump();
	fNhit--;
       }
     } while (duplicateIndex>=0);
   }

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