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Date: Fri, 25 Jan 2019 11:54:33 +0000
Message-ID: <CALKiJKrnsL=4wYsE1BemBL0XAo=cwYdwMyhy0yVKGeZLqyeZyQ@mail.gmail.com>
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: Andrey O Gromov <AGromov@alfabank.ru>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000003629b7058046fe3b"
Subject: Re: [PHP-DEV] Proposal fo "Code-free constructors declaration"
From: rowan.collins@gmail.com (Rowan Collins)

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On Fri, 25 Jan 2019 at 11:05, Nikita Popov <nikita.ppv@gmail.com> wrote:

> class Point {
>     public int $x;
>     public int $y;
>     public int $z;
> }
>
> // (syntax just a dummy)
> $origin = new Point { x = 0, y = 0, z = 0 };
>
> Where the object initialization syntax ensures that all properties that
> don't have defaults are initialized. Especially now that we have typed
> properties and it is feasible to have data objects with just public typed
> properties, I think that this is the way to avoid ctor boilerplate, rather
> than making it simpler to write that boilerplate.
>


The big difference here is that you are making the short-hand the
responsibility of the caller, rather than the definer. I suspect there's a
Venn diagram of use cases where the two features would be useful.

In particular, the call-site syntax you have there would work really well
for a value type, and could go with having full support for that (e.g. have
the resulting object be immutable / copy-on-write); it works less well for
something like dependency injection, where the properties would normally be
private, and you might want to combine the short-hand with some normal
constructor logic.

Regards,
-- 
Rowan Collins
[IMSoP]

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