DIP4: Properties

[Leandro Lucarella]

Nick Sabalausky, el 24 de julio a las 16:16 me escribiste:
> "Chad J" <chadjoan at __spam.is.bad__gmail.com> wrote in message 
> news:h4cv6h$st6$1 at digitalmars.com...
> >
> > Have you checked out haXe's syntax for properties?
> > http://haxe.org/ref/properties
> >
> 
> Yes, in fact, I've been using haxe a lot lately for work. It certainly beats 
> AS2 and PHP, but there's still a lot about it I really dislike, and it's 
> property syntax is one of my biggest complaints.
> 
> For those not familiar with haxe, compare the following property in my 
> current D proposal, the equivilent C#, and the equivilent haxe:
> 
> --------------------------------
> // D, current DIP4
> public int foo
> {
>     get { return value; }
>     set { value = set; }
> }

I think you have good points about not repeating yourself, but I still
find it too magical. I think I prefer something a little more explicit,
even if I have to repeat myself. And I think there should be a way to get
the real underlaying variable easily.

What about:

public int foo: _foo
{
    get { return _foo; }
    set(v) { _foo = v; }
}

Then, when you want to use the real internal variable, you just use _foo.
Even when you are repeating yourself, the internal implementation and the
external interface are decoupled; you can rename the property to bar
without changing the implementation:

public int bar: _foo
{
    get { return _foo; }
    set(v) { _foo = v; }
}

The default protection attribute for underlaying property variables are
private, but you can change it with:

public int bar: protected _foo
{
    get { return _foo; }
    set(v) { _foo = v; }
}

I think is is not much harder to write and maintain comparing with what
you proposed, but I find it a lot more explicit and thus clear. You don't
have to remember where that automagically variables came from. You can
implement properties without even a real storage variable using your form:

public int baz // readonly
{
    get { return 1; }
}

What do you think?


-- 
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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