Hi ROOTers,
I think I found a bug in the setting of branch status for TChains (maybe
for TTrees, too?). The following test macro is used to merge a set of
trees, only paying attention to the active branches - "Run" & "momentum".
TChain c("myntp");
c.Add("data*.root");
c.SetBranchStatus("*",0);
c.SetBranchStatus("momentum");
// c.GetListOfBranches(); // problem line
c.SetBranchStatus("Run");
c.Merge("test.root");
It works as expected. If I uncomment the "problem line", I find that my
c.SetBranchStatus("Run") has no effect - my merged file has a chain with
an empty "Run" branch. Somehow in retrieving the list of branches, I am
blocking myself from correctly setting additional branch statuses for the
chain.
In my real macro, expanded upon the above test macro, I would like to get
the list of branches from the chain before setting the status of the
branches. Would there be a work around for the above problem? For
instance, after getting my list of branches, is there a method I can use
to undo the harm that GetListOfBranches() has done?
As an additional query - can my merged chain be created with the headers
for the inactive branches REMOVED? Currently, I find that the merged file
has a tree which contains all the headers for all branches of the trees
used (the inactive branches being empty).
Thanks,
Chris
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