Hi,
I want to do a function which returns an array of histograms TH1F* running inside a loop, and sum the return of the function at each iteration. So I created a function which returns the histograms I want but I can’t use these histograms outside the function (when I call it in the loop).
This is a simplified code of what I want to do :
std::vector< TH1F* > test()
{
std::vector< TH1F* > hist;
hist.push_back( new TH1F("hist","title",100,0.,10.) );
hist[0]->Fill(5);
hist[0]->Fill(3);
hist[1]->Fill(8);
return hist;
}
void bla()
{
std::vector < TH1F* > histogram;
histogram.push_back(test()[0]); histogram[0]->Draw(); // try 1
histogram = test(); histogram[0]->Draw(); // try 2
test()[0]->Draw(); // try 3
}(of course in my code I included all the headers…)
In the test() function the histograms are OK, I can draw them etc…
But in the bla() function I can’t do anything with the output of test(), I always have a Segmentation Violation !
Also, in my real code, the error is not a segmentation violation but it is :
Warning: Error occurred during reading source files
Warning: Error occurred during dictionary source generation
!!!Removing /export/home/zp/comin/pythia8/pythia8175/btag/ntuple0/Merging_cc_ACLiC_dict.cxx /export/home/zp/comin/pythia8/pythia8175/btag/ntuple0/Merging_cc_ACLiC_dict.h !!!
Error: /cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/x86_64/root/5.34.18-x86_64-slc5-gcc4.3/bin/rootcint: error loading headers…
Error in : Dictionary generation failed!
Info in : Invoking compiler to check macro’s validity
Info in : The compiler has not found any problem with your macro.
Probably your macro uses something rootcint can’t parse.
Check root.cern.ch/viewvc/trunk/cint/doc/limitati.txt for Cint’s limitations.
*** Interpreter error recovered ***
I’m compiling with ACLiC …
Thanks for your help !