Hi Rooters!
If I understand correctly, TDatabasePDG is supposed to protect itself against
multiple instances:
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TDatabasePDG::TDatabasePDG() : TNamed("PDGDB","The PDG particle data base")
{
// Create PDG database.
fParticleList = 0;
if (fgInstance) Warning("TDatabasePDG", "object already instantiated");
else fgInstance = this;
}
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But compiling the following code does not give me the above warning I would
expect.
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#include<iostream.h>
#include<TROOT.h>
#include<TDatabasePDG.h>
int main()
{
TROOT root("PDGtest", "How about multiple instances?");
TDatabasePDG *mydatabase;
TDatabasePDG *mydatabase2;
mydatabase = new TDatabasePDG();
mydatabase2 = new TDatabasePDG();
cout << "Adress of mydatabase: " << mydatabase <<endl;
cout << "Adress of mydatabase2: " << mydatabase2 <<endl;
}
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Do I miss something??? And isn't the constructor supposed to be non-public
(Singleton pattern by Gamma etc.)?
Ciao,
Ingo
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Ingo Strauch Budapester Str. 30, 20359 Hamburg, Tel.: +49 40 7421 4722
Office: DESY, Group H1/AAC1, Room 1c354, Notkestr. 85, 22607 Hamburg
strauch@mail.desy.de Tel. +49 40 8998 2312
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I. Phys. Institut RWTH Aachen, Room 28B210, Sommerfeldstr. 14, 52056 Aachen
strauch@toots.physik.rwth-aachen.de Tel. +49 241 80 7183
http://www-users.rwth-aachen.de/Ingo.Strauch/ FAX. +49 241 8888 661
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