Method Clone() and possible memory leak

ROOT
1

Dear ROOT experts!

Suppose I have something like this:
TH1F hist = (TH1F)someAppropriateObject->Clone();
should I always use “delete hist” in order to avoid memory leak?

Regards
defo900

2

Hi,

for histograms, it depends if you rely on the ROOT memory management or not. You can learn more about it here: root.cern.ch/root/htmldoc/guide … -directory .

Cheers,
Danilo

3

Dear Danilo

Thank you for answer.
If I understand correctly when I use clang for my script run I should not write “delete hist”. However when I compile script using g++ then I should write “delete hist”.
Is that correct?

Regards
defo900

4

Hi,

No - ROOT behaves the same whether interpreted or compiled. And it’s always safe to delete the histogram - but you might not need it if it’s added to the current directory, which is ROOT’s default behavior, see TH1::AddDirectory() root.cern.ch/doc/master/classTH … d7e0f82614

Cheers, Axel.

5

Dear Axel

Now I have understood. Thanks.

Regards
defo900