Re: Bug in TObjArray?

From: John Idarraga <idarraga_at_cern.ch>
Date: Fri, 17 Sep 2010 14:44:20 +0200


But then why Arr.GetEntries() gives 0 ? I thought the Fast version of GetEntries was precisely a Fast access to the number of entries, only safe when you have not performed any manipulation. Available for certain cases. I agree with Vassili that it is somewhat annoying and may be an error prone. But I may be misunderstanding.

thanks,

John

Axel Naumann wrote:
> Hi Vassili,
>
> yes, that's on purpose, think of
>
> new (Arr[0]) TObject;
>
> Cheers, Axel.
>
>
> Vassili Maroussov wrote on 09/17/2010 02:31 PM:
>
>> Dear ROOTers,
>>
>> I'm wondering why TObjArray is designed in such a way that an attempt to
>> access the [fLowerBound] element of an empty TObjArray doesn't cause any
>> error (please see the example attached). Moreover, it has a rather
>> unpleasant side effect: after the access GetEntriesFast() reports that
>> the array isn't empty any more. Is it done purposely?
>>
>> Regards,
>>
>> Vassili
>>
>>
>
>
Received on Fri Sep 17 2010 - 14:44:39 CEST

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