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From: "Pat Rogers" <progers@acm.org>
Subject: Re: Module size (was Re: Software landmines)
Date: 1998/09/04
Message-ID: <6spojo$8ir$1@uuneo.neosoft.com>#1/1
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References: <6snlos$bh6$1@hirame.wwa.com> <904912650snz@nezumi.demon.co.uk>
 <35EFFB78.21BBBED6@ksc.nasa.gov> <6spfvf$nun$1@hirame.wwa.com>
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Organization: NeoSoft, Inc.  
Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada
Date: 1998-09-04T00:00:00+00:00
List-Id: <comp.lang.ada>

Robert Martin wrote in message <6spfvf$nun$1@hirame.wwa.com>...
>As you know, in OO we create classes.  Classes declare methods (functions).


Bruce Douglass says in his book "Real-Time UML"

    A class can be thought of as the type of an object.

The part I like is the footnote that accompanies the above sentence:

    Strictly speaking, the type refers to the interface
    of the object -- objects with the same interface
    are of the same type, regardless of their class.
    The class of an object defines its internal
    implementation. This is not normally a useful
    distinction unless you are using languages that
    make the difference visible, such as Java.

I think OO is about creating types, not classes.

Just my $0.02.

-- pat

Patrick Rogers
progers@acm.org
http://www.neosoft.com/~progers