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Date: Fri, 07 Mar 2025 18:29:07 +0200
To: Rob Landers <rob@bottled.codes>
Cc: internals@lists.php.net
Subject: Re: [PHP-DEV] RFC: short and inner classes
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From: juris@glaive.pro (Juris Evertovskis)

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On 2025-03-07 01:48, Rob Landers wrote:

> They're not 100% arbitrary, but mostly due to technical limitations.
> 
> - One level deep: Nesting multiple levels results in ambiguous grammar.
> - As a parent class: This also results in ambiguity.
> - Abstract: If it cannot be a parent class, it doesn't make sense for 
> it to be abstract.

Hey,

I thought that an abstract inner class would be one that a subclass (of 
the outer class) must implement, not one that must be extended. Similar 
to abstract methods.

But have you considered enums, traits and interfaces? I assume inner 
classes would work as expected if defined on traits or enums, but what 
is going to happen if I try to define one on an interface?

BR,
Juris
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<p id=3D"reply-intro">On 2025-03-07 01:48, Rob Landers wrote:</p>
<blockquote type=3D"cite" style=3D"padding: 0 0.4em; border-left: #1010ff 2=
px solid; margin: 0">
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<div>
<div>They're not 100% arbitrary, but mostly due to technical limitations.</=
div>
<div>&nbsp;</div>
<div>- One level deep: Nesting multiple levels results in ambiguous grammar=
=2E</div>
<div>- As a parent class: This also results in ambiguity.</div>
<div>- Abstract: If it cannot be a parent class, it doesn't make sense for =
it to be abstract.</div>
</div>
</div>
</blockquote>
<p>Hey,</p>
<p>I thought that an abstract inner class would be one that a subclass (of =
the outer class) must implement, not one that must be extended. Similar to =
abstract methods.</p>
<p>But have you considered enums, traits and interfaces? I assume inner cla=
sses would work as expected if defined on traits or enums, but what is goin=
g to happen if I try to define one on an interface?</p>
<p>BR,<br />Juris</p>
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