Hi, I created a base class AnaBase using MakeSelector and am try to inherit from it into a class AnaJet. I include the .h and .C files in the attachment. The error message is below. Does anybody know what I am doing wrong? I tried both commenting and not commenting the general methods that are not implemented in AnaJet (Init,Notify,SetOption,SetObject,SetInputList,GetOutputList). Cheers, and thanks, Thomas nfo in <TUnixSystem::ACLiC>: creating shared library /data/zenith209b/schorner/root/./AnaJet_C.so In file included from /data/zenith209b/schorner/root/filePHFvWs.h:29, from /data/zenith209b/schorner/root/./filePHFvWs.cxx:13: /data/zenith209b/schorner/root/AnaJet.C: In method `Bool_t AnaJet::ProcessCut(int)': /data/zenith209b/schorner/root/AnaJet.C:227: warning: unused variable `Int_t iCounter' /data/zenith209b/schorner/root/AnaJet.C:226: warning: unused variable `class TLorentzVector * iterator_Object' dlopen error: /data/zenith209b/schorner/root/./AnaJet_C.so: undefined symbol: Notify__6AnaJet Load Error: Failed to load Dynamic link library /data/zenith209b/schorner/root/./AnaJet_C.so In file included from /data/zenith209b/schorner/root/filePHFvWs.h:29, from /data/zenith209b/schorner/root/./filePHFvWs.cxx:13: /data/zenith209b/schorner/root/AnaJet.C: In method `Bool_t AnaJet::ProcessCut(int)': /data/zenith209b/schorner/root/AnaJet.C:227: warning: unused variable `Int_t iCounter' /data/zenith209b/schorner/root/AnaJet.C:226: warning: unused variable `class TLorentzVector * iterator_Object' /usr/lib/crt1.o: In function `_start': /usr/lib/crt1.o(.text+0x18): undefined reference to `main' /data/zenith209b/schorner/root/./filePHFvWs.o: In function `AnaJet::ShowMembers(TMemberInspector &, char *)': /data/zenith209b/schorner/root/./filePHFvWs.o(.text+0xc373): undefined reference to `AnaBase::ShowMembers(TMemberInspector &, char *)' /data/zenith209b/schorner/root/./filePHFvWs.o(.gnu.linkonce.d.__vt_6AnaJet+0x94): undefined reference to `AnaJet::Notify(void)' /data/zenith209b/schorner/root/./filePHFvWs.o(.gnu.linkonce.d.__vt_6AnaJet+0xe4): undefined reference to `AnaJet::Init(TTree *)' /data/zenith209b/schorner/root/./filePHFvWs.o: In function `AnaJet type_info function': /data/zenith209b/schorner/root/./filePHFvWs.o(.gnu.linkonce.t.__tf6AnaJet+0x22): undefined reference to `AnaBase type_info function' /data/zenith209b/schorner/root/./filePHFvWs.o(.gnu.linkonce.t.__tf6AnaJet+0x2d): undefined reference to `AnaBase type_info node' /data/zenith209b/schorner/root/./filePHFvWs.o: In function `AnaJet::AnaJet(AnaJet const &)': /data/zenith209b/schorner/root/./filePHFvWs.o(.AnaJet::gnu.linkonce.t.(AnaJet const &)+0x292): undefined reference to `AnaBase::~AnaBase(void)' /data/zenith209b/schorner/root/./filePHFvWs.o: In function `AnaJet::AnaJet(TTree *)': /data/zenith209b/schorner/root/./filePHFvWs.o(.AnaJet::gnu.linkonce.t.(TTree *)+0x24): undefined reference to `AnaBase::AnaBase(TTree *)' /data/zenith209b/schorner/root/./filePHFvWs.o(.AnaJet::gnu.linkonce.t.(TTree *)+0x58): undefined reference to `AnaBase::~AnaBase(void)' /data/zenith209b/schorner/root/./filePHFvWs.o: In function `AnaJet::~AnaJet(void)': /data/zenith209b/schorner/root/./filePHFvWs.o(.gnu.linkonce.t._._6AnaJet+0x30): undefined reference to `AnaBase::~AnaBase(void)' /data/zenith209b/schorner/root/./filePHFvWs.o: In function `AnaBase::AnaBase(AnaBase const &)': /data/zenith209b/schorner/root/./filePHFvWs.o(.AnaBase::gnu.linkonce.t.(AnaBase const &)+0x2d): undefined reference to `AnaBase virtual table' collect2: ld returned 1 exit status *** Interpreter error recovered *** Error in <TSelector::GetSelector>: file AnaJet.C+ does not have a valid class deriving from TSelector
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