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From: Stephane.Barbey@di.epfl.ch (Stephane Barbey)
Newsgroups: comp.lang.ada
Subject: Re: An Ada9X mimic of C++ friends?
Date: 9 Feb 1995 09:59:40 GMT
Organization: Ecole Polytechnique Federale de Lausanne
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References: <3h7u4p$8cp@bellboy.ucc.uconn.edu> <3hareb$nq5@lang8.cs.nyu.edu>
 <3hcao9$96b@solar.sky.net>
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Date: 1995-02-09T09:59:40+00:00
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In article <3hcao9$96b@solar.sky.net>, jhoward@solar.sky.net (John Howard) 
: So my question is: does the explicit use of "TAGGED" in Ada95 have the same 
: negative consequences as specifying "virtual"?

No, Ada 83 and Ada 95 take the approach that every primitive operation
(i.e. method) of a tagged type (i.e. a class) can be freely overriden.

The reserved words "virtual" (C++) or "override" (Object Pascal) are
not needed in Ada 95, because dispatching (i.e. dynamic binding) does
not occur on a by-method basis, but on a by-call basis (i.e. the
dispatching calls), thus providing all the power and more flexibility
than typical OO languages.

-Stephane 

--
Stephane Barbey				"It's not easy getting real wings"	
INJ-335, barbey@di.epfl.ch