Xref: utzoo comp.lang.c++:5125 comp.windows.x:14414
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!noao!arizona!sunquest!francis
From: francis@sunquest.UUCP (Francis Sullivan)
Newsgroups: comp.lang.c++,comp.windows.x
Subject: using X11 with C++ callbacks
Message-ID: <640@sunquest.UUCP>
Date: 19 Oct 89 22:01:37 GMT
Organization: Sunquest Information Systems, Tucson
Lines: 34

I would like to be able to use C++ callbacks in X11.  Since this is not
supported, I'm trying to come up with a simple method to simulate this.
For now I just write a C wrapper that calls the correct C++ routine, but
I get the feeling that there is an easier way.

here is an example using wrappers:
class dud {
   char name[8];
  public:
   dud(char *n) { strcpy(name, n);};
   who() {printf ("I am %s\n", name);};
};

dud big("big");
dud dum("dum");

// dummy wrappers
wrap_big_who() { big.who(); }
wrap_dum_who() { dum.who(); }

some_prog() {

   // what I would like
   // XCallMeBack(big.who);  
   // XCallMeToo(dum.who);  

   // what I have to use
   XCallMeBack(wrap_big_who);  
   XCallMeToo(wrap_dum_who);  
}

---
Anyway, a cpp method or a c++ method for dealing with the above is desirable.
Suggestions are welcome,