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Date: Wed, 11 Feb 2015 11:32:11 +0400
Message-ID: <CA+9eiLuSQdKG7vgiJTE+ifUXPpLGyakOt3-FNJiPfYkAdFocZw@mail.gmail.com>
To: Yasuo Ohgaki <yohgaki@ohgaki.net>
Cc: Joe Watkins <pthreads@pthreads.org>, Patrick Schaaf <php@bof.de>, 
	internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11c3ea3c6d842a050ecb0088
Subject: Re: [PHP-DEV] Design by Contract
From: dmitry@zend.com (Dmitry Stogov)

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Content-Type: text/plain; charset=UTF-8

So, I think we have to support them as well.

On Wed, Feb 11, 2015 at 10:12 AM, Yasuo Ohgaki <yohgaki@ohgaki.net> wrote:

> Hi Dmitry and Joe,
>
> On Wed, Feb 11, 2015 at 4:02 PM, Dmitry Stogov <dmitry@zend.com> wrote:
>
>> I think we can't support contracts on interfaces and abstract methods.
>> How D works?
>
>
> D supports contract in structure and interface. Structure is more like
> classes in D, though.
>
> interface I
> {
>     int foo(int i)
>     in { assert(i > 7); }
>     out (result) { assert(result & 1); }
>
>     void bar();
> }
>
> http://dlang.org/interface.html
>
>
> Eiffel support contracts for interfaces.
>
>   class interface DICTIONARY [ELEMENT] feature
>
>    put (x: ELEMENT; key: STRING) is
>             -- Insert x so that it will be retrievable
>                            -- through key.
>                   require
>                           count <= capacity
>                           not key.empty
>                    ensure
>                           has (x)
>                           item (key) = x
>                           count = old count + 1
>
>                 ... Interface specifications of other features ...
>
>   invariant
>
> 0 <= count
> count <= capacity
>
>   end -- class interface DICTIONARY
>
>
> https://archive.eiffel.com/doc/manuals/technology/contract/
>
> If there is no technical difficulties, I would like to have it.
>
> Regards,
>
> --
> Yasuo Ohgaki
> yohgaki@ohgaki.net
>

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