TChain::Add() with wildcard and nentries!=kBigNumber?

ROOT
1

Dear ROOT experts,

Maybe I’m just missing an implementation detail but why do the underlying calls to TChain::AddFile() in TChain::Add() (when the latter is called with a wildcard pattern) hard-code nentries=kBigNumber instead of using nentries as it was passed to TChain::Add()?

In case this helps, links to the current HTML doc head:

Best regards,
Jeroen

2

We do that on purpose because it is unlikely that all the Trees in the list of files have the same number of entries.

Rene

3

Yes, that makes sense for the case that nentries>0 (but !=kBigNumber) but what about the case where nentries<=0? The advantage of this option is that one can use it to make sure that all files are accessible and contain a tree with the right name.

Jeroen

4

yes you are right. I missed this case. Now fixed in the SVN trunk.

Rene

5

Sweet! Thanks René.

Jeroen