Hi Reiner,
> and c_int is the same value as c_short.
This is surprising (be see below). Could you please send me a tar file
reproducing this problem?
TClass object are supposed to be unique for each class instance,
but can change over the course of execution.
To support the ability to read file without the shared library,
when you open a TFile, the TClass corresponding to the classes that
are in the file but do not have a dictionary in memory will be
created. If you then load the library corresponding to this classes,
the TClass object created by the TFile will be deleted and the full
fledge TClass objects will be created instead.
> In the allplication code I call
> TClass * c_short = Child<Short_t>::Class();
> and in the shared library code I call
> TClass * c_int = Child<Int_t>::Class();
> and c_int is the same value as c_short.
This might or might be correct. To assert whether this
is really issue or not do:
TClass * c_short = Child<Short_t>::Class();
std::cerr << "Got " << c_short->GetName() << " while expecting Child<Short_t>\n";
and in the shared library code
TClass * c_int = Child<Int_t>::Class();
TClass * c_short = Child<Short_t>::Class();
std::cerr << "Got " << c_int->GetName() << " while expecting Child<Int_t>\n";
std::cerr << "Got " << c_short->GetName() << " while expecting Child<Short_t>\n";
Cheers,
Philippe.
-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of
Reiner.Rohlfs@obs.unige.ch
Sent: Thursday, August 05, 2004 8:35 AM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] Is classname::Class() unique?
Hi ROOT team
Assume I have a class called "Base" (derived from TNamed) and a derived template
class called "Child".
I create two dictionary informations in the LinkDef.h file for the Child class:
#pragma link C++ class Child<Short_t>+;
#pragma link C++ class Child<Int_t>+;
The code of these classes together with the dictionary code is linked in a
shared library.
Now I use these classes in a linked application program, linked with the shared
library of these classes Base and Child:
In the allplication code I call
TClass * c_short = Child<Short_t>::Class();
and in the shared library code I call
TClass * c_int = Child<Int_t>::Class();
and c_int is the same value as c_short.
If I call Child<Int_t>::Class() in the application code before I call
TClass * c_int = Child<Int_t>::Class();
in the shared library code the values of c_int and c_short are different.
Is this what I have to expect or is this a bug?
I use ROOT version 4.00.08 and gcc version 2.95.3, SuSE LINUX.
Thanks Reiner.
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