Event driven object-to-object: C++ template class mecanism ( NOT STL or STDC++)

bretzeltux · 12-22-2003, 07:25 PM

Hi there, ( excuse my funny english :-)

I am to write ( re-re-rewrite/re-re-rethink like hell) yet another ncurses
based UI library. - Not the topic of my question though...

I am very well confortable with the drawing stuff and objects infrastructures...

Where I am stuck is about the object-to-object events relation.
Here below is a bit of code of the model I would want to create:

Code:

template < typename ClientClass, typename eventClass >
class ConnexionEvent{
     ...
 public:
     typedef int (ClientClass::*pCallbackT)(eventClass*);
     pCallbackT method;
     ConnexionEvent(pCallbackT classInstanceMethod, ...blah){
         method = classInstanceMethod;
         ...blah
     }
     ...
};

Notice the point:

Code:

   ...
   typedef int (ClientClass::*pCallbackT)(eventClass*);

I sware this code compile without errors...

My limited knowledge of C++ template programming prevents me to implement a consistent container class to hold a list or map or whatever ; thus a common place into where I could retreive an instance of that ConnexionEvent<... , ...> node.

That is. My whish is to be able to call directly the client'method of the actual object instance for a particular event class...

I thought of a std::map<objclass*, void*, lessclass> containing ConnexionEvent<objclass,evclass> address as void*... I can't try it right now since my computer is now out of reach

BTW: I whish the gnu gcc C++ conceptors would/could implement something similar to the Trolltech's QT signal/slot ( moc ) so geniously straitforward mecanism

Tell me if it is impossible or if there are known solutions...
Thanks,
Bretzel

dakensta · 12-23-2003, 08:12 AM

Quote:

Here below is a bit of code of the model I would want to create:

I am afraid that you will have to give a bit more detail about the model

... I am not clear where ConnexionEvent fits in to your model.

Quote:

... something similar to the Trolltech's QT signal/slot ( moc ) so geniously straitforward mecanism

Go to http://libsigc.sourceforge.net/ and you will find an excellent template based example of a signal / slot mechanism.

bretzeltux · 12-23-2003, 02:45 PM

Dakensta, I really thank you for your advice. You know what ? I have this package installed on my linux box ( mdk9.2; even the devel pckg ) and I did not notice that it does exactly what I need!!

Thus forget my model, i have to say I did not yet read docs of libsigc++ but I am really confident that it is what I need (regaring what I read on the at the URL) then I gonna be advancing into my prj very fast after beeing confortable with that lib...

W00t!

Thank you again
Bretzel