Hi, Using root 1.03/09 on a SGI macine running IRIX 6.2, I've got a problem in declaring a TClonesArray of a self defined class: Neglecting ClassDef and ClassImp on their correct positions, these classes are invalid for root applications and it's impossible to create a TClonesArray of them (why?). Defining ClassDef and ClassImp in the class definition and implementation, and using rootcint to create the dictionary, I receive an error message like: /products/cernroot/pro/sgi_62/gcc/root/bin/rootcint -f Dictionary.C -c -I/products/cernroot/pro/sgi_62/gcc/root/include -I. -I./include/arte -I./include/auto -DUSE_ROOT -p -t \ RecoTower.hh RecoCluster.hh RecoEvent.hh LinkDef.h Note: operator new() masked 1c Warning: Link requested for undefined class RecoEvent FILE: LINE:0 Warning: Link requested for undefined class RecoTower FILE: LINE:0 Warning: Link requested for undefined class RecoCluster FILE: LINE:0 Afterwards the program Compilation ends up with unresolved symbols like : RecoEvent::Class_Version RecoEvent::DeclFileName and so on What can I do to overcome this problem? Thanks, Robert +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + Robert Loke + + Humboldt University Berlin + + Invalidenstr. 110 + + 10115 Berlin + + Germany + + + + e-mail : loke@ifh.de + +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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