[Swig-user] Extending classes based on inheritance

[Anders B. <an...@cs...>]

Hi. Thanks for a nice tool (SWIG), when it works, it just works!

But I have a small problem, where I need for every class that is derived
from a base class Referenced add two features (for reference counting).

Currently I'm doing it like this:

%define ADD_REFERENCED_CLASS(class)
%feature("ref") class "$this->reference();"
%feature("unref") class "$this->unreference();"
%ignore class::unreference;
%ignore class::reference;
%enddef


// Explicitly list all classes that are derived from Referenced
ADD_REFERENCED_CLASS(Node)
ADD_REFERENCED_CLASS(SomeClass)
ADD_REFERENCED_CLASS(SomeOtherClass)
...


so we have

class Referenced {
  void reference();
  void unReference();
};

class Something : public Referenced
{
};

class Node : public Something
{
}

Now is there something that could be done to avoid having to list each and
every class that is derived from Referenced explicitly?

Something that can traverse the inheritance hierarchy and apply this macro
whenever it is discovered.

Thanks!

-- 
__________________________________________
Anders Backman, HPC2N
90187 Umeå University, Sweden
an...@cs... http://www.hpc2n.umu.se
Cell: +46-70-392 64 67