[ROOT] cint problem with pointers-to-pointers

From: Peter Steinberg (steinber@rcf.rhic.bnl.gov)
Date: Wed Apr 04 2001 - 22:41:34 MEST 

hi root guys -

PHOBOS is trying to move to ROOT3, which is going well, but for
a few hiccups.  here's one:

my class has a member:

class TPhMapSet
{
...
 TPhPadMap** fMaps;         // List of map pointers
...
}

what i find in the rootcint generated code is a few things:

-------------------------------------------------------------------------

void TPhMapSet::ShowMembers(TMemberInspector &R__insp, char *R__parent)
{
   // Inspect the data members of an object of class TPhMapSet.
...
   R__cl->SetStreamer("*fMaps",R__TPhMapSet_fMaps);  
...
}

AND

void R__TPhMapSet_fMaps(TBuffer &R__b, void *R__p, int)
{
   TPhPadMap*** fMaps = (TPhPadMap***)R__p;
   if (R__b.IsReading()) {
      R__b >> *fMaps;
   } else {
      R__b << (TObject*)*fMaps;
   }
}

------------------------------------------------------------------------

clearly the problem is that the compiler cannot find any function to match 

 R__b >> *fMaps;

the thing is that this problem does not occur in ROOT2.25.02, where
in TPhMapSet::ShowMembers i get the code

 R__insp.Inspect(R__cl, R__parent, "*fMaps", &fMaps);

which is the same as the other members in the class, unlike the ROOT3
version, which is different (i.e. with a SetStreamer).

Interestingly, this mechanism has no problems with basic types
and ROOT classes.  do i need to add a new operator to my class, or
can i fix this in the LinkDef?

Thanks,
Peter


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Dr. Peter A. Steinberg			     Brookhaven National Laboratory
Assistant Scientist                               Bldg 555, Upton NY, 11973
Office: 631-344-4390			     mailto:Peter.Steinberg@bnl.gov
Mobile: 917-549-3094                      http://www.rhic.bnl.gov/~steinber
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