Why do you want to avoid calling TClonesArray::Clear ? Rene Brun On Wed, 30 Jul 2003, Hamlet wrote: > (18:39, mercoledì 30 luglio 2003) > > What are you trying to accomplish? > > I'm trying to skip the more steps it's possible in my program, as > redundant clearings. > I'm filling a tree with an object, err... Event, which has a pointer to > a TClonesArray (CA) of, say, Particle-s. > I use an instance of Event, call it pEvent, as branch address and like a > buffer. > So if on first loop I put 5 Particle-s in pEvent, the CA will have 5 > newly created entries. Streamer will write them. > On second loop I am trying to clear nothing (this Particle object are > simple enough to allow this without risk). Say that second event has > only 3 particles; if it's possible to set fLast to -1, I'm going to do > that and then to add (via TClonesArray::operator[]) the 3 particles. > If it's not possible, I'll leave fLast untouched, assign particles > (always with the same operator[]) and then I shall set fLast to 2; in > both cases Streamer() should write 3 particles, right? > If an odd event had no particle, anyway, I couldn't save a CA with zero > elements (unless I Clear() it, which is what I'm trying to avoid). > > As you see it's not an essential request, anyway. > >
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