Re: Automatic split

From: Rene Brun (Rene.Brun@cern.ch)
Date: Fri May 08 1998 - 20:35:31 MEST


Hi Manuel,
Your proposal is pretty simple to implement.
If no objections or other proposals, I will add the feature
in the next version.

Rene Brun


Manuel Sanchez wrote:
> 
> Hello Rooters,
> 
>     I would like to ask your opinion on a new "automatic split" feature,
> the idea is as simple as having the posibilty to mark some data members
> in a class so they won't be processed by the automatic split algorithm;
> that is, the responsability to create the appropiate branches for those
> members is left to the user. For instance, it coud be something like:
> 'if the comment field of a data members starts with '-' then it won't be
> processed by automatic split'.
> 
>     This would be different from marking that data member as not
> persistent (using '!' as the first character in the comment field) in
> the sense that the particular data member is persistent (it is stored
> when the automatically generated Streamer() method is used) but the
> responsability to generate the branches (in split mode) is left to the
> user.
> 
>     This change would make easier to implement automatic split
> strategies different from the default one.
> 
>     I think the changes in the code are as simple as adding one single
> line to TTree::Branch() and TBranchObject::SetAddress() ( is this right?
> )
> 
>     There are at least two workarounds (i'm using one of them):
> 
>     1.- Mark the data member as non-persistent (using '!') and then
> generate the Streamer function by hand
> 
>     2.- Use the '-' in the comment field and use different Branch() and
> SetAddress() methods from those which come with Root.  (as external
> functions or inheriting new classes from TTree and TBranchObject ...)
> 
>     3.- Any more?
> 
>     Thanks for your attention,
>     Manuel.



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