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Date: Thu, 10 Dec 2015 15:25:48 +0000
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Subject: Re: [PHP-DEV] Class Friendship in PHP
From: rowan.collins@gmail.com (Rowan Collins)

Bishop Bettini wrote on 10/12/2015 14:44:
> On Thu, Dec 10, 2015 at 12:02 AM, Dustin Wheeler <mdwheele@ncsu.edu> wrote:
>> I don't know that I would use friendship
>> as a means to make an entire package (namespace, in PHP's case) aware
>> of a single object.
>
> I think it's the other way around: a single object declares its friendship
> with an entire namespace.

I guess the point is that if package visibility were also implemented, 
you could simply make the relevant methods public, and the class as a 
whole private to the namespace. Any public APIs could then be on a 
public class in the same namespace, e.g in the same way as having 
methods "public final function foo()" and "protected function do_foo()", 
you could have "public class Thing" referencing "private class 
InternalThing".

The advantage of friend declarations seems to be precisely that they are 
*not* making a general declaration of scope, but marking very specific 
couplings. If a large number of classes need access to something marked 
private, it's clearly not really private.

Regards,
-- 
Rowan Collins
[IMSoP]