RE: [ROOT] TTree::SetAlias

From: Philippe Canal (pcanal@fnal.gov)
Date: Tue Jul 08 2003 - 22:26:41 MEST

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In reply to: Gene Van Buren: "[ROOT] TTree::SetAlias"
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Hi Gene,

Aliases an utility used by TTreeFormula.  They have 
no particular advantages besides being short-cuts 
and being saved.  They are used by TTreeFormula as 
simple string substitution.  Compared to your solution 
the Aliases are missing a 'creation' validity check.  
(i.e. if an Alias is incorrect you will only be warned 
when it is actually used in TTreeFormula).

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Gene Van Buren
Sent: Tuesday, July 08, 2003 2:32 PM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] TTree::SetAlias


I see that variable "aliases" have been introduced
into TTree recently (30 June patch). While I have
not yet used them, they sounds strikingly similar to
what I have been doing via TTreeFormulas for quite
some time now. I am curious as to the differences
between these aliases and TTreeFormulas.
One thing I can see immediately is that the aliases
can be persistent (wonderful!). Are there other
differences? Are aliases parsed more quickly?

Thanks,
-Gene


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