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Date: Tue, 10 Feb 2015 16:36:24 +0900
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Message-ID: <CAGa2bXaPLA0hAkxseUsAd+s+Hq60pia7t8X4DusND8r2fiFwYQ@mail.gmail.com>
To: Joe Watkins <pthreads@pthreads.org>
Cc: Dmitry Stogov <dmitry@zend.com>, Patrick Schaaf <php@bof.de>, internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11c11a980fca45050eb6f400
Subject: Re: [PHP-DEV] Design by Contract
From: yohgaki@ohgaki.net (Yasuo Ohgaki)

--001a11c11a980fca45050eb6f400
Content-Type: text/plain; charset=UTF-8

Hi Joe,

On Tue, Feb 10, 2015 at 4:31 PM, Joe Watkins <pthreads@pthreads.org> wrote:

> Actually I'm not sure it's at all sane to try to override contracts, I'd
> actually avoid that completely, so no need to name contracts and no need
> for magic __invariant.


For example,

class Animal {
   protected $legs;
   require($legs >= 0);
}

class Snake extends Animal {
  // Snake is fine, no leg
}

class Human extends Animal {
  // 2 legs. $this->leg === 2
}

Overriding makes sense for many cases.

Regards,

--
Yasuo Ohgaki
yohgaki@ohgaki.net

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