Is there a generic way to know components of the TTreeFormula?

[bellenot]

Did you try to search the forum? I found several possible related questions, like:

Which branches does a TTreeFormula use?

Hi, I have a TTree, and a TTreeFormula (unknown until runtime). I would like to turn off all branches except for those used by the TTreeFormula, so that iteration over the tree reads less data and goes faster. Is there a way to ask the TTreeFormula which branches it needs? I’ve looked through the docs, and can’t find anything, except that TTreeFormula has a protected data member “fBranches”, but no public method for accessing it. Am I missing something? Regards, Jon

Branches needed to evaluate a TTreeFormula

I’m using a TTreeFormula in a loop over all entries of a TTree. At the moment i leave all branches enabled to ensure the formula has all inputs: myQuasiCode(std::vector<TString> copyvars, std::vector<std::pair<TString,TString>> formulas) { if (formulas.empty()) { tree->SetBranchStatus("*",0); for (auto var : copyvars) { tree->SetBranchStatus(var,1); } } else { /// TODO: do something smarter here tree->SetBranchStatus("*",1); } std::vector<TTreeFormula*> m_formulas; std::vector<f…

Otherwise @pcanal might give some hints