Subj : Can you mimic atexit() for class functions?
To   : borland.public.cpp.borlandcpp
From : gary <news@cordelli.net>
Date : Tue Oct 07 2003 11:54 pm

just wondering if it is possible to have a member function in various 
(different) classes, but provide a single additional class that defines 
some kind of "AddCallback()" function that each object of the various 
other classes can call in order to add their own member function to a 
callback list so that the single additional class can invoke the list of 
added callbacks each in turn ?

this is sort of like the way atexit() works in C, but in that case it is 
easy to just define every added callback as "void (*pfn)()", whereas in 
the C++ case, all the different classes would seem to necessarily have a 
different declaration that can't be cast to "void (*pfn)()" to way you 
can in C.

any idea if this is possible at all, or am i just looking at it from the 
wrong direction (i.e., writing C++ while thinking C) ?  for instance, 
would it be possible to do this if each of the different classes each 
inherited a member function from the single additional class so that 
each different class' callback function had the same type (e.g., "void 
(CallbackList::*MyCallback)()", if i did that right) ?

hope this question is clear.  it confused even me, and i asked it...

.