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From: a5uy@vax5.cit.cornell.edu
Newsgroups: comp.sys.mac.programmer
Subject: C++ for a beginner
Message-ID: <1991Feb21.012535.2899@vax5.cit.cornell.edu>
Date: 21 Feb 91 05:25:35 GMT
Distribution: comp
Organization: CIT, Cornell University
Lines: 29

I've done a lot of programming on other platforms but never on the Mac.  I need
to put a fairly simple graphics application together in a hurry and find myself
trying to learn C++ in the process so I can use the class library included with
THINK C.  Suggestions on good reference/tutorial books would be greatly
appreciated!

Here's a first obviously basic question...but a good answer would clear up all
sorts of fog... All the sample progs have a main() that looks like this:

void   main(void)
$
       gApplication = new(CPedestalApp);
       ((CPedestalApp*)gApplication)->IPedestalApp();
       gApplication->Run();
       gApplication->Exit();


My question is why does gApplication need to be type cast as a (CPedestalApp*)
in order to send the message IPedestalApp() when, as far as I can tell, it's
type *IS* CPedestalApp* ???  And assuming this type cast is necessary, why is
it *NOT* necessary in order to send messages Run() and Exit() ???

Thanks for any and all info!!!
Since this is probably too basic for this group, feel free to answer via
E-mail!

Jan Speth                        The strong force is mediated by gluons,
A5UY@VAX5.CIT.CORNELL.EDU        not to be confused with cyano-acrylate ester,
A5UY@CRNLVAX5                    which is Krazy Glue.