RE: [ROOT] ClassImp vs. ClassImpUnique

From: Philippe Canal (pcanal@fnal.gov)
Date: Fri Sep 26 2003 - 21:35:39 MEST

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Hi Sebastian,

ClassImp could ClassImpUnique with the 2nd argument being __LINE__
ClassImpUnique uses the 2nd arguments to declare a variable that should
be unique.  However, I both A.C and B.C have a ClassImp at the same line
and C.C include both A.C and B.C, then ClassImp defines a duplicated
variable and the way around this problem is to use ClassImpUnique instead
of ClassImp and provided a different 'qualifier' than __LINE__.

Bottomline, unless your compiler complains that ClassImp redefines an
existing variable, you do not need to worry about ClassImpUnique.

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Sebastien Greder
Sent: Friday, September 26, 2003 4:59 AM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] ClassImp vs. ClassImpUnique



 sorry to bother, but I forgot to put a subject

 hello Rooters,
 
  I'd just like to have some explanation concerning the difference
  between ClassImp and ClassImpUnique, maybe I missed some
  doc, if so, could you point me the location.
 
  Thanks,
 
   seb

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