Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!lth.se!newsuser
From: dag@control.lth.se (Dag Bruck)
Newsgroups: comp.object
Subject: Re: Examples of Multiple Inheritance?
Message-ID: <1990Dec4.103937.25471@lth.se>
Date: 4 Dec 90 10:39:37 GMT
References: <60700005@inmet>
Sender: newsuser@lth.se (LTH network news server)
Organization: Department of Automatic Control, Lund, Sweden
Lines: 26

I have once made good use of MI in C++.

The task was to implement a logging window using the AT&T iostream
library and the InterViews user interface library.

The low-level output of iostream was made by deriving from
`streambuf'.  The user interface was was derived from an `HBox' in
order to combine a `TextDisplay', a scrollbar, etc.  I also added
functionality so the window de-iconizes itself when new output
arrives.

Please note that the use of MI in the AT&T iostream library is not
involved here -- the `streambuf' is at a lower level.

I think this application of MI was sucessful.  It was a practical way of
combining two class hierarchies, and I think the solution is very
clean.  This application could easily have been implemented without MI
(I drafted such a solution as well), but I guess this would have
required writing more code.

Dag M. Bruck
--
Department of Automatic Control		E-mail: dag@control.lth.se
Lund Institute of Technology
P. O. Box 118				Phone:	+46 46-104287
S-221 00 Lund, SWEDEN			Fax:    +46 46-138118


Brought to you by Super Global Mega Corp .com