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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: (placepo) Properties
Date: Mon, 6 Dec 2010 15:24:27 -0800 (PST)
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Date: 2010-12-06T15:24:27-08:00
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On Dec 5, 9:15=A0am, "Martin Krischik" <krisc...@users.sourceforge.net>
wrote:
> Am 02.12.2010, 00:24 Uhr, schrieb Georg Bauhaus =A0
> <rm-host.bauh...@maps.futureapps.de>:
>
> > I don't see how "automatic" get/set subprograms offer
> > software engineering advantage, even when they are terse
> > and semi-implicit and purport to avoid repetitive clutter.
>
> Actually they don't. Not if you can't replace the automated get/set with =
a =A0
> user defined function. Especially for set this is important as set should=
 =A0
> check the value and notify observers of the change. I see far to many =A0
> mutators which neglect this. And get should protect the value from outsid=
e =A0
> changes by by either returning the value as constant or by coping the =A0
> value. But especially in Java I often wonder why accessors and mutators =
=A0
> are used at all.
>
> For example in Scala where accessors and mutators are automaticly =A0
> generated (without get and set prefix as Scala is functional [1]) this ha=
s =A0
> come back to haunt the language as it becomes very complicated to create =
=A0
> rich accessors and mutators.
>
> Ok, one thing is left: properties can be overridden. For example a =A0
> abstract property can be defined in an interface.
>
> Martin
>
> [1] Which makes me wonder: The set and get prefix are not needed in Ada o=
r =A0
> Java - so why not do without them?
> --
> Martin Krischik
> mailto://krisc...@users.sourceforge.nethttps://sourceforge.net/users/kris=
chik

I agree that setters SHOULD ensure that the values they change [to]
are valid; that was the main purpose of them!