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Date: Tue, 10 Feb 2015 20:31:30 +0900
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Message-ID: <CAGa2bXbPxQyX=7M8ZWhdenu=MbR3stAjixbwL915Jyg2SBr4Hg@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=001a1133dee6ccffca050eba3cf8
Subject: Re: [PHP-DEV] Design by Contract
From: yohgaki@ohgaki.net (Yasuo Ohgaki)

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

Hi Joe,

On Tue, Feb 10, 2015 at 4:40 PM, Joe Watkins <pthreads@pthreads.org> wrote:

> It doesn't seem to make sense to do that, a derived class should be able
> to define additional contracts, but not change the contracts of it's parent.


I forgot that invariants in D and Eiffel implicitly inherits parent's
invariants.
So classes that causes problems have design bug.

Please go ahead editing the file. I wouldn't have time until next morning.
There will be hours. I'll wait as long as it takes.

Regards,

--
Yasuo Ohgaki
yohgaki@ohgaki.net

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