Re: [ROOT] About the size of struct in ROOT

From: Huang Xingtao (huangxt@hepg.sdu.edu.cn)
Date: Wed Apr 02 2003 - 02:57:28 MEST 

For example:
 void main() {
 struct A{
   unsigned int  a;
   unsigned int  b;
   short  int       c;
};
cout<<"Size of A:"<<sizeof(A)<<endl;
}

----- Original Message ----- 
From: "Rene Brun" <Rene.Brun@cern.ch>
To: "Huang Xingtao" <huangxt@hepg.sdu.edu.cn>
Cc: <roottalk@pcroot.cern.ch>
Sent: Tuesday, April 01, 2003 4:47 PM
Subject: Re: [ROOT] About the size of struct in ROOT


> Hi,
> 
> This may happen because of type alignment.
> Please give an example.
> 
> Rene Brun
> 
> Huang Xingtao wrote:
> > 
> >    Part 1.1    Type: Plain Text (text/plain)
> >            Encoding: base64
> I use the Root (3.01/06) package. I meet the following problem. The size of the
> struct gived by ROOT is greater than the sum of size of all the type in the
> struct. I don't know how to calculat it in the ROOT.

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