X-Spam-Check-By: sourceware.org
From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
References: <20070121143731 DOT GC25379 AT ns1 DOT anodized DOT com>
Subject: RE: cygwin source question
Date: Sun, 21 Jan 2007 16:29:19 -0000
Message-ID: <009401c73d79$4cf91d40$a501a8c0@CAM.ARTIMI.COM>
MIME-Version: 1.0
Content-Type: text/plain; 	charset="US-ASCII"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 11
In-Reply-To: <20070121143731.GC25379@ns1.anodized.com>
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On 21 January 2007 14:38, Christopher Layne wrote:

> I notice in some places, there are double-negates, like:
> 
> me->read_ready |= ret || !!(events & (FD_READ | FD_ACCEPT | FD_CLOSE));
> 
> What's the rationale for these? To enforce either a 0 or 1, to be directly
> in line with boolean, rather than a zero or non-zero result?

  It's a standard C idiom for that, yeh, it normalizes zero/non-zero into 0/1.


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/