From: Nick Leaton <nickle@calfp.co.uk>
Subject: Re: Visibility and access to "public" attributes
Date: 1997/09/02
Date: 1997-09-02T00:00:00+00:00 [thread overview]
Message-ID: <340BF0B7.BF7D3029@calfp.co.uk> (raw)
In-Reply-To: 01bcb787$eeb5a180$7e80400a@gavinspc
Gavin Collings wrote:
>
> Don Harrison <nospam@thanks.com.au> wrote in article
> <EFv4p4.ME2@syd.csa.com.au>...
> > I wrote:
> >
> > :Mike Card wrote:
> >
> > :I accept this more accurately emulates the Eiffel functionality, and..
> > :
> > ::.. there is no restriction in Ada that prevents an access function
> > ::from having the same name as a class' (tagged type's) attribute.
> > :
> > :True.
> >
> > What remains, of course, is the fact that the Eiffel mechanism is simpler
> > and more direct - objectively-speaking, that is. :)
> >
> > Why objectively? Because in Eiffel, the attribute is made available in one
> > step and in Ada, two steps. Less steps implies directness which, in turn,
> > implies simplicity, so we can conclude that the Eiffel mechanism is both
> > more direct and simpler.
>
> ... than Ada ... Agreed. Would you care to contrast the Eiffel mechanism
> (objectively, of course) with that specified for Delphi properties. Here I
> have complete freedom to define within say class circle.
>
> property Radius : Double read fRadius - gives a read-only radius
> or property Radius : Double read fRadius write fRadius - gives direct
> read/write access
> or property Radius : Double read fRadius write SetRadius - accessor called on
> set
>
> and write client code like
>
> circle1.radius := circle2.radius;
>
> Apart, perhaps, from the overhead of having to declare fRadius separately,
> this method looks certainly more flexible and probably in most interesting
> cases more direct than the Eiffel approach.
>
A bit obscure. Lets say you also have area as a readable atribute.
Setting the area is possible, since we can derive the radius as a
consequence. How does
that work with Delphi.
--
Nick
Eiffel - Possibly the best language in the world - unless proven
otherwise.
next prev parent reply other threads:[~1997-09-02 0:00 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-08-29 0:00 Visibility and access to "public" attributes card
1997-08-29 0:00 ` Patrick Doyle
[not found] ` <JSA.97Aug29190453@alexandria.organon.com>
1997-08-30 0:00 ` Patrick Doyle
1997-08-30 0:00 ` Jon S Anthony
1997-09-01 0:00 ` Patrick Doyle
1997-08-30 0:00 ` Darren New
1997-09-02 0:00 ` Don Harrison
1997-09-02 0:00 ` Don Harrison
1997-09-02 0:00 ` Gavin Collings
1997-09-02 0:00 ` Patrick Doyle
1997-09-02 0:00 ` Nick Leaton [this message]
1997-09-02 0:00 ` Gavin Collings
1997-09-03 0:00 ` Don Harrison
1997-09-05 0:00 ` Nick Leaton
1997-09-05 0:00 ` Patrick Doyle
[not found] ` <01bcba0e$418f7380$2001df0a@gavinspc>
1997-09-05 0:00 ` Nick Leaton
1997-09-02 0:00 ` Jon S Anthony
1997-09-02 0:00 ` Peter Horan
-- strict thread matches above, loose matches on Subject: below --
1997-08-29 0:00 card
1997-08-29 0:00 ` Ted Velkoff
1997-08-30 0:00 ` Patrick Doyle
1997-08-30 0:00 ` Darren New
1997-09-02 0:00 card
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