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From: James O'Connor <oconnor@apci.net>
Subject: Re: C/C++ knocks the crap out of Ada
Date: 1996/02/26
Message-ID: <3132195F.349@apci.net>#1/1
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references: <00001a73+00002504@msn.com> <4etcmm$lpd@nova.dimensional.com>
   <312515DF.7D3B@cmlj.demon.co.uk> <4gad29$ddp@druid.borland.com>
 <4ggshe$7bk@goanna.cs.rmit.EDU.AU> <4gmp2o$ian@ux1.lmu.edu>
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newsgroups: comp.lang.ada,comp.lang.c,comp.lang.c++
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Date: 1996-02-26T00:00:00+00:00
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Ray Toal wrote:
> 
> ok@goanna.cs.rmit.EDU.AU (Richard A. O'Keefe) wrote:
> 
> >(4) C++ in particular has been changing very rapidly.  It seems as if every
> >    time I turn around there is a new keyword.  I was looking at some code
> >    fragments today in a book; they were full of things like
> >       void HelpIndex () (RTMessage) = [CM_FIRST+CM_HelpIndex];
> >    I've used three C++ compilers, read every book with "Stroustrup" on it,
> >    and keep on browsing through the draft standard, and haven't the foggiest
> >    notion what this is supposed to do.
> 
> That line of code was not standard C++ (not that there even is a standard
> yet :-). It was a "syntax extension" that came with the Borland C++
> Compiler Version 3.x as part of the ObjectWindows Framework.
> Interestingly when Borland released 4.0 they removed that "syntax
> extension."
> 
> I would be interested to know if any Ada vendors have released
> Ada compilers with vendor-specific syntax modifications.
> 
> Ray Toal


This was only used for a Windows application (a TWindow classs, to be 
specific) to tie certain message responses (In this case a Menu choice 
with an ID of CM_HelpIndex) to certain functions.  (When the (MS) window 
receives the Command Message of CM_HelpIndex, it calls the C++ function 
HelpIndex defiend in the TWindow subclass behind the 'Real' Window.  
You're right, for OWL 2.0, they changed to a standard function 
declaration and added a couple of MACROS to handle the mapping...

James O'Connor
oconnor@apci.net