Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!ditka!comeau
From: comeau@ditka.Chicago.COM (Greg Comeau)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Lattice C++
Message-ID: <38576@ditka.Chicago.COM>
Date: 10 May 91 14:10:16 GMT
References: <1474@loki.une.oz.au>
Sender: comeau@ditka.Chicago.COM (Greg Comeau)
Reply-To: comeau@csanta.attmail.com (Greg Comeau)
Organization: Comeau Computing
Lines: 31

In article <1474@loki.une.oz.au> kevin@loki.une.oz.au (Kevin Pollard) writes:
>I am trying to help someone with an Amiga and Lattice C++.
>Initially, I don't want to have to master C++ just to help him, so I want
>to stick to standard C.

That's one valid approach to it.

>Can I access graphics in standard C using Lattice C++?

Some people on BIX said this was impossible a while back.  Personally,
I disbelieve such a response however with Lattice C++, based on the
1.x spec of C++, such a request involved some gymnastics depending
upon exactly what it is you're trying to do and how.

>If so, what's the smallest program (this isn't a challenge) that will
>set graphics mode and draw a line on the graphics screen, then wait
>for a keystroke, then exit.

I'm not versed enough in AmigaDOS specific, however what I can tell you
is that compiler supporting either the 2.0 or 2.1 spec of C++ have
something called 'extern "C"' syntax which allows you an interface to
C.  Under some, for instance, Comeau C++, we literally pick up your C
compilers include files.  Hence, the call in C++ would be *EXACTLY* the
same as it would be in C.

- Greg
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