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Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!tektronix!orca!mako!jans
From: jans@mako.UUCP (Jan Steinman)
Newsgroups: net.lang
Subject: Re: Orphaned Response
Message-ID: <1018@mako.UUCP>
Date: Thu, 30-Jan-86 21:04:20 EST
Article-I.D.: mako.1018
Posted: Thu Jan 30 21:04:20 1986
Date-Received: Sat, 1-Feb-86 07:33:54 EST
References: <26@hplabsc.UUCP> <15100023@ada-uts.UUCP>
Reply-To: jans@mako.UUCP (Jan Steinman)
Organization: Tektronix, Wilsonville OR
Lines: 19
Summary: 

In article <15100023@ada-uts.UUCP> richw@ada-uts.UUCP writes:
>"What does 'object-oriented' mean?" is a good question.
>
>In Clu and Ada, there are the notions of "parameterized 
>clusters" and "generic packages", respectively, which
>help you write "generic" procedures...  Note that the type of
>an object will influence the "lookup of code"...

Keep in mind that Ada's generic packages are fixed at compile time, more like
macros than objects.  When a generic package is instantiated, a copy of code
appropriate for the given data type is compiled in.  Contrast this to Smalltalk
message sends, where the method to be executed is not determined until run
time, and which, in the case of "perform:", "value:", et. al. changes on the
fly.

-- 
:::::: Artificial   Intelligence   Machines   ---   Smalltalk   Project ::::::
:::::: Jan Steinman		Box 1000, MS 60-405	(w)503/685-2956 ::::::
:::::: tektronix!tekecs!jans	Wilsonville, OR 97070	(h)503/657-7703 ::::::