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Date: Wed, 26 Jun 2013 14:21:39 +0200
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Subject: AW: AW: [PHP-DEV] RFC Proposal: New assign value operator
From: rstoll@tutteli.ch ("Robert Stoll")

I agree,  $price =3D new MoneyValue(29.99); makes more sense and that's =
what I questioned in my first email.
The benefit is small, I said that as well, and the drawbacks are maybe =
bigger as you already outlined.

-----Urspr=C3=BCngliche Nachricht-----
Von: Johannes Schl=C3=BCter [mailto:johannes@schlueters.de]=20
Gesendet: Mittwoch, 26. Juni 2013 14:14
An: Robert Stoll
Cc: RQuadling@GMail.com; 'Tom Oram'; 'PHP internals'
Betreff: Re: AW: [PHP-DEV] RFC Proposal: New assign value operator

On Wed, 2013-06-26 at 13:54 +0200, Robert Stoll wrote:
> As far as I see it, it is kind of an operator overload mechanism for =
the assign operator.
> This can be useful for small utility classes such as Money, Email etc.
>=20
> An example was given:
> $price =3D new MoneyValue();
> $price :=3D 29.99;
>=20
> Instead of writing something like:
> $price =3D new MoneyValue();
> $price->setPrice(29.99);
>=20
> The benefit is small, but can lead to better readable code. But since=20
> it is only for the assign operator and not for + - etc., for me the=20
> question remains open why not writing something like this directly:
>=20
> $price =3D new MoneyValue(29.99);

I see no benefit.

It adds a new operator with new semantics which one has to learn to =
understand the code and which is hard to Google.

Also such objects seem to be value objects, so it should be immutable =
thus allowing code like

   $price =3D new MoneyValue();
   $price->setPrice(29.99);

looks like bad design.

If you have to type

   $price =3D new MoneyValue(29.99);

often you can shorten it

   use MoneyValue as MV;
   $price =3D new MV(29.99);

sure still longer than :=3D but no new syntax and more explicit.

johannes




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