Problem writing templated class to file

Hi,  

I can successfully write objects of type WeightedLink to file ina program and read them out again in a CINT session.

I then try to make WeightedLink templated and adapt the LinkDef.h file accordingly. rootcint then stops with an error message:  

Error: link requested for unknown class WeightedLink G__auto6316LinkDef.h  

As you can see, the class has a default constructor. It is my understanding that putting the following statement in the LinkDef.h should make ROOT aware of the double version of the template code, but apparently it doesn't. Any suggestions as to what might be wrong?  

#pragma link C++ class WeightedLink<double>+;    

Thanks,

Marc    

The original WeightedLink.h is:  

      class WeightedLink : public TNamed

      {

      public:

            ClassDef(WeightedLink,1);  

            Id _id_from;

            Id _id_to;

            double _weight;  

            WeightedLink():_id_from(Id(0)),_id_to(Id(0)),_weight(0.0){}  

            WeightedLink

            (

                  Id          id_from,

                  Id          id_to,

                  double      weight

            ):



            _id_from(id_from),




            _id_to(id_to),




            _weight(weight)


            {

            }

      };

 

      typedef WeightedLink   D_WeightedLink;

 

 

It is changed into:  

      template <class Weight>

      class WeightedLink : public TNamed

      {

      public:

            ClassDef(WeightedLink,1);  

            Id _id_from;

            Id _id_to;

            double _weight;  

            WeightedLink():_id_from(Id(0)),_id_to(Id(0)),_weight(0.0){}  

            WeightedLink

            (

                  Id          id_from,

                  Id          id_to,

                  double      weight

            ):



            _id_from(id_from),




            _id_to(id_to),




            _weight(weight)


            {

            }

      };

 

      typedef WeightedLink<double>   D_WeightedLink;

 

The relevant entry in LinkDef.h is changed from

#pragma link C++ class WeightedLink<+;

into

#pragma link C++ class WeightedLink<double>+;

-    

Dr. Marc de Kamps

Biosystems Group

School of Computing

University of Leeds

LS29JT, Leeds, UK  

 <mailto:dekamps_at_comp.leeds.ac.uk> dekamps_at_comp.leeds.ac.uk

http:/www.comp.leeds.ac.uk/dekamps   Received on Mon Aug 18 2008 - 12:27:41 CEST