Hi Frank, The code generated by MakeSelector is assumed to be run from an interactive or batch root session running under a TApplication. In your case, you can run in a standalone program. In this case, remove teh line ClassDef(selector,0) from selector.h. To generate an executable module, you must compile selector.C, like: gcc `root-config --cflags --libs` selector.C program.C -o program.exe Rene Brun Frank Winklmeier wrote: > > Hi, > > I am trying to run a class which was originally produced by MakeSelector() > in a standalone program. The program looks like this: > > #include "selector.h" > > int main(int argc, char **argv) { > > selector *sel = new selector(); > > } > > The selector.C and .h file are like they have been produced by > MakeSelector() without any changes. > When I am trying to compile with: > > gcc `root-config --cflags --libs` program.C > > it produces the following error: > > /tmp/ccThcUXm.o(.gnu.linkonce.t._ZN8selectorC1EP5TTree+0x19): In function > `selector::selector[in-charge](TTree*)': > : undefined reference to `vtable for selector' > collect2: ld returned 1 exit status > > Does anyone know what this message means? I am using RooT 3.10-01 on RH9. > > Thanks, Frank
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