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Date: Wed, 11 Feb 2015 16:12:04 +0900
Message-ID: <CAGa2bXbQq_2EonMzfnjjYwNaexe_Y12_T81efFGjFp36iYjDMg@mail.gmail.com>
To: Dmitry Stogov <dmitry@zend.com>
Cc: Joe Watkins <pthreads@pthreads.org>, Patrick Schaaf <php@bof.de>, 
	internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11c2f9b4dbe443050ecabaa2
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 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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