Re: (T)string members and TClonesArray branches

Hi Phil,

Which version of ROOT are you using?

Cheers,
Philippe.

On 2/21/11 11:03 AM, Philip Rodrigues wrote:
> Oops, sorry, that version of the script was broken. The one attached here
> should work.
>
> Phil
>
> On Monday, February 21, 2011 12:00:08 pm Philip Rodrigues wrote:
>> Hi,
>> I have a TClonesArray containing a class with a TString member variable
>> (although I see the same behaviour with std::string), and I'm storing the
>> TClonesArray as a TTree Branch.
>>
>> What I want to do in the end is read the values of the TString branch
>> without having to read any other branches, but I couldn't manage it using
>> branches and leaves directly, or with TTreeFormula.
>>
>> So I took a step back, and looked at the output of TTree::Scan, which I
>> don't understand: for every instance it shows the value of the TString
>> from the first instance. Is this intended behaviour? (For an int, the
>> values between instances do vary). If so, is there a way I can get at the
>> individual TString instances without reading the whole object off of disk?
>>
>> I've attached a minimal example: load it up and run createTree() to create
>> the tree, and readTree() to run a TTree::Scan that shows the issue.
>>
>> Thanks,
>> Phil
Received on Tue Feb 22 2011 - 18:19:49 CET