Hi Piotr, sorry for the late reply. Could you try to put the TROOT ctor inside the main program. Like: main() { TROOT t("t","test THashTable and MPar"); MPar params[3]; THashTable tb; ... } TROOT initializes the registered dictionaries. Sometimes it might happen that at the time the global TROOT is called some dictionaries have not yet been registered (via other global objects, since the order of initialization is in principle undefined). Cheers, Fons. Piotr Swiat wrote: > > I've tried to used THashTable class in order to give every parameter in > event > a nickname. I am using root v2.20 and I have following files: > -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
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