Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!cimshop!davidm
From: davidm@cimshop.UUCP (David Masterson)
Newsgroups: comp.lang.c++
Subject: Re: assignment to `this' is deprecated in C++ 2.0
Summary: Callback Routines
Message-ID: <422@cimshop.UUCP>
Date: 5 Jun 89 17:01:21 GMT
References: <9432@alice.UUCP>
Organization: Consilium Mt. View CA
Lines: 13
In-reply-to: ark@alice.UUCP's message of 4 Jun 89 00:56:33 GMT

In the discussion of "this", I'm wondering what the mechanism is for
supporting references to classes by library functions outside of C++.  For
instance, functions within things like a screen manager (X, Suntools) can take
arguments that they will then pass to other functions when the screen manager
makes a callback (Callback routines).  In order to set the context of the
routine that is called back, does it make sense to pass a reference to "this"
to a screen manager function for later passing to the callback routine?
If not, what is the prescribed method of leaving the "class" context of C++
for dealing with routines in other areas/languages and then reconstituting
that context when the routines later return?

David Masterson					(preferred address)
uunet!cimshop!davidm		or		DMasterson@cup.portal.com