Hi Robert,
I'm sure that you know well that the mechanism of
C++ templates and the mechanism of overloaded virtual functions, both provided
by C++, are pretty much complementary, and in principle, one can live more or less
happily using only one technique out of 2. One certainly can also combine both.
However one of the best and most attractive features of ROOT - full integration
of C++ interpreter into the environment - from my [very pragmatic] point of view
strongly favors the second approach: interpreting templated code is a real
challenge and I believe that it is quite easy for everybody to write a templated
class which Masa would then see in his nightmare dreams every night for many
years... -:)
So as a user, I'd weigh the advantages of having the pleasure of writing out
the AlternativeList's versus the pleasure of having fully interactive access to
the code and data without pushing the envelope of CINT's abilities - ROOT provides
polymorfic containers which can be used instead of the templated ones without any
loss of functionality.
Although I completely agree that pushing the envelope often leads
to a progress,
-best, Pasha
Robert Hatcher wrote:
>
> Hi,
> I've developed a class that derives from STL vector, ala:
>
> #include <vector>
> #include "AltListItem.h"
> class AlternativeList : public vector<AltListItem*>
> {
> public:
> // specialized methods, eg.
> void KeepTopChoices(UInt_t n=2, Bool_t keepOrder=false);
> Bool_t CheckConsistency() const;
>
> // additional member variable access
> Float_t GetQualityFactor() const;
> void SetQualityFactor(Float_t quality);
>
> protected:
> Float_t fQuality; // an overall evaluation of this collection
> }
>
> What doesn't seem to work is I/O. If I have a TObject derived class
> that has one of these as a member variable and I write it out to a
> file and then read it back in then the fQuality field is correctly
> restored but the vector itself is empty. I know that I/O of vector
> objects themselves works, so what would it take to make this case of
> "Is A" work?
>
> -robert
>
> Robert W. Hatcher | rhatcher@fnal.gov 650-840-3102
> FNAL CD/CP (MINOS) | MS 220, PO Box 500, Batavia IL 60510
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