Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!ba0k+
From: ba0k+@andrew.cmu.edu (Brian Patrick Arnold)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: HYPERCARD limitations, speed issue
Message-ID: <MZgwHNi00UhWE6fXoa@andrew.cmu.edu>
Date: 17 Jan 90 01:05:29 GMT
References: <614@ascom.UUCP>,
	<37876@apple.Apple.COM>
Organization: Mechanical Engineering, Carnegie Mellon, Pittsburgh, PA
Lines: 33
In-Reply-To: <37876@apple.Apple.COM>


Also,

If, for example, you want to redirect a message to another object, thus
sort-of-implementing class-based message-passing, you can do the
following:

ON Yowza
  Foo "Whoagolly, gee", whiz
END Yowza

ON Foo bar,cat,dog
  SEND "Foo bar,cat,dog" to button "Ziggy"
END Foo

This will preserve the (non-)existence of parameters, e.g., if the
caller passed nothing, nothing continues to be passed, and individual
parameters like "Whoagolly, gee" aren't evaluated until button "Ziggy"
actually gets them.  E.g., this example would pass "Whoagolly, gee" as
the first parameter, bar, and "whiz" as the second parameter, cat. 
Wunderkind keyword empty is passed as dog.

To do OOP-like programming, you'd have to come up with a way of having
an object "know" its class and redirect messages to scripts set up as
individual classes.  You could also implement inheritance in this way,
having the "class" object "know" its parent class.  It would be a bit of
work with lots of caveats and wouldn't exactly be blazing.  I wish to
God HyperCard supported classes and inheritance in a more OOP style.

Rhetorical Complaint #336237: could somebody show me how to "send" a
function call and get its result?

- Brian