Error in filling Tree branch with vector of a Class

ROOT
1

I am having trouble in filling a vector of Class in TTree. Following is my code and error.

////////////bar.hxx
#include <vector>
#include "EventLoopFunction.h"
#include "TTree.h"

struct bar{ int id, type, charge;};

class qHit{
public:
  int id;
  std::vector<bar> qclsthit;
  virtual ~qHit(){qclsthit.clear();};
  void Print(){return;};

  ClassDef(qHit,1)
};

class ReconCluster:public EventLoopFunction{
private:
  TTree *fTree;
  vector<bar> hit; 
  vector<qHit> qclst;

public:
   ReconCluster(){};
   virtual ~ReconCluster() {};
   void Clear();
   void Initialize();
   bool operator()(Event&);
   void Finalize();
   void GetBarHits(Event&, vector<bar>*);
   void GetQHits(vector<bar>&, vector<qHit>*);
};
/////////////////bar.cxx
#include "bar.hxx"
#include "TROOT.h"
ClassImp(qHit)

int main(int argc, char **argv){
   gROOT->ProcessLine(".L /Users/analysis/ana/v0r0/include/loader.C+");
   ReconCluster myCode;
   EventLoop(argc,argv,myCode);
   return 0;
}

void ReconCluster::Initialize(){
fTree = new TTree("tr","Cluster Tree"); 
fTree->Branch("bar","vector<bar>",&hit);
fTree->Branch("qHit","vector<qHit>",&qclst);
}
void ReconCluster::Clear(){
hit.clear();
qclst.clear();
}
bool ReconCluster::operator()(Event& ev){
GetBarHits(ev,&hit);
GetQHits(hit,&qclst);
fTree->Fill();
Clear();
return;
}
....
////////// Loader.C
#include "bar.hxx"
#include <vector>

#ifdef __MAKECINT__
#pragma link C++ class bar+;
#pragma link C++ class vector<bar>+;
#pragma link C++ class qHit+;
//#pragma link C++ class vector<qHit>+; commented for now
#endif
Compilation ERROR: (Macosx)
#CMT---> building application ../Darwin/clst_f.exe
Undefined symbols for architecture x86_64:
  "vtable for qHit", referenced from:
      qHit::qHit()in bar.o
      qHit::~qHit()in bar.o
      qHit::qHit(qCluster const&)in bar.o
  "ROOT::GenerateInitInstance(qHit const*)", referenced from:
      __static_initialization_and_destruction_0(int, int)in bar.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[3]: *** [../Darwin/clst_f.exe] Error 1
make[2]: *** [clst_f] Error 2
make[1]: *** [common_target] Error 2
make: *** [check_config] Error 2

Linux ERROR:
#CMT---> building application ../Linux-x86_64/clst_f.exe
../Linux-x86_64/bar.o: In function `__static_initialization_and_destruction_0':
/home/fumi/analysis/ana/v0r0/cmt/../src/bar.cxx:3: undefined reference to `ROOT::GenerateInitInstance(qHit const*)'
../Linux-x86_64/bar.o: In function `qHit':
/home/fumi/analysis/ana/v0r0/cmt/../src/../include/barhit.hxx:5: undefined reference to `vtable for qHit'
/home/fumi/analysis/ana/v0r0/cmt/../src/../include/barhit.hxx:5: undefined reference to `vtable for qHit'
/home/fumi/analysis/ana/v0r0/cmt/../src/../include/barhit.hxx:5: undefined reference to `vtable for qHit'
/home/fumi/analysis/ana/v0r0/cmt/../src/../include/barhit.hxx:5: undefined reference to `vtable for qHit'
/home/fumi/analysis/ana/v0r0/cmt/../src/../include/barhit.hxx:5: undefined reference to `vtable for qHit'
../Linux-x86_64/bar.o:/home/fumi/analysis/ana/v0r0/cmt/../src/../include/barhit.hxx:5: more undefined references to `vtable for qHit' follow
collect2: ld returned 1 exit status
make[3]: *** [../Linux-x86_64/clst_f.exe] Error 1
make[2]: *** [clst_f] Error 2
make[1]: *** [common_target] Error 2
make: *** [check_config] Error 2

The error looks like from virtual table of the class, not sure how to fix this.
Thanks for any help.

2

[quote]/home/fumi/analysis/ana/v0r0/cmt/…/src/bar.cxx:3: undefined reference to `ROOT::GenerateInitInstance(qHit const*)’[/quote]You need to generate the dictionary for the class qHit.

Philippe.