Hi Claus,
deriving a class from photclass is a good idea. You implement in this new class
new functions and you can easily regenerate photclass.h if you change
your tree.
However, you do not need to overide the function Loop. Simply implement
photclass::Loop.
In the automatically generated code, the loop function is not virtual.
I would need to see your photclass.h to understand the error message.
But I repeat, do not define Aphotclass:Loop. You have to implement
only photclass::Loop
Rene Brun
Claus Horn wrote:
>
> Hello ROOTers,
>
> I am trying to derive a class (Aphotclass) from the class
> which is generated automatically by MakeClass (photclass).
> My declaration looks like this:
>
> class Aphotclass : public photclass {
> Aphotclass(TTree *tree=0) : photclass(tree) {};
> ~Aphotclass() {};
> //Int_t Cut(Int_t entry); // I dont want to change these
> //Int_t GetEntry(Int_t entry);
> //Int_t LoadTree(Int_t entry);
> //void Init(TTree *tree);
> void Loop(); // This is what I want to overwrite
> //Bool_t Notify();
> //void Show(Int_t entry = -1);
> };
>
> Under ROOT I get:
>
> root [1] .L Aphotclass.C
> root [2] Aphotclass m;
> Error: can not call private or protected function FILE:(tmpfile) LINE:1
> Aphotclass.h 18 Aphotclass Aphotclass::Aphotclass(TTree*);
> Calling : Aphotclass::Aphotclass();
> Match rank: file line signature
> * 0 Aphotclass.h 18 Aphotclass Aphotclass::Aphotclass(TTree*);
> *** Interpreter error recovered ***
> root [3]
>
> There seems to be a problem with the constructor.
>
> I would be very glad if somebody could help me to get
> this runnig.
>
> Thanks,
>
> Claus
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