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Date: Mon, 13 Mar 2017 10:11:32 +0500
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To: Yasuo Ohgaki <yohgaki@ohgaki.net>
Cc: PHP Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=94eb2c07f34aab1a9b054a95be17
Subject: Re: [PHP-DEV] Type variants
From: michael.vostrikov@gmail.com (Michael Vostrikov)

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2017-03-12 23:01 GMT+05:00 Fleshgrinder <php@fleshgrinder.com>:

> As I said already, there is no problem if you just change the direction
> of the inheritance.
>

Ok, how to inherit Rectangle, Square, Rhomb, all of which are
Parallelogram? In your example Rectangle knows restrictions of Square and
any Rectangle is instance of Square. It does not match domain model.


2017-03-13 1:40 GMT+05:00 Yasuo Ohgaki <yohgaki@ohgaki.net>:

> I pasted wrong URL. This URL has better example code.
>
> https://msdn.microsoft.com/en-us/library/w86s7x04.aspx
>
> Getters/setters is a good feature, I'd like them to be in PHP, but they
should be placed in some classes. What are these classes? We still cannot
use all squares as rectangles and some rectangles as squares without
questions. And if we already have one $rectangle with w == h, we cannot
just use it as square, we must create new object based on $rectangle data.

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