220 20842 <53c897d6-8bd0-4f07-af6a-9f7ac99ed6ea@isocpp.org> article Path: news.gmane.org!not-for-mail From: joewoodbury@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Null -conditional and -coalescing operators Date: Sat, 26 Sep 2015 13:11:39 -0700 (PDT) Lines: 108 Approved: news@gmane.org Message-ID: <53c897d6-8bd0-4f07-af6a-9f7ac99ed6ea@isocpp.org> References: <4c3e2ee7-2159-4e93-a439-7d5c94c38c9c@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_4021_641098898.1443298299612" X-Trace: ger.gmane.org 1443298324 8160 80.91.229.3 (26 Sep 2015 20:12:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 26 Sep 2015 20:12:04 +0000 (UTC) Cc: joewoodbury@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCBMHLUN7EEBB7HXTOYAKGQEPH3VQ3A@isocpp.org Sat Sep 26 22:11:49 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f198.google.com ([209.85.192.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Zfvos-000531-Bi for gclcip-std-proposals@m.gmane.org; Sat, 26 Sep 2015 22:11:42 +0200 Original-Received: by pdbnu13 with SMTP id nu13sf245079626pdb.3 for ; Sat, 26 Sep 2015 13:11:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version:content-type:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=6pLMY0ts71g1aVEXURkf8S3v1Cb/QjUDIp5qmK9KgHI=; b=aI4TwUKvnexxbcTWn6jZYotKmJOYkLhjBhq0U9Sn1Ie4xj7pXCL564g6MmDpGxYtgk PrM6Qy/tPg5R/QMre4CrTChdC2tC5RDYFiuedmDRUCFSev6Sn88FdRcZoXoGecnaiOXU M83wQsLQEDki3FXA0BPNh8KmD22ZRTdZZZVRc0UKmyU6DIfiOoY2sj7Nf2lAL+Q620/G qZnwcf3ycC6ACjP9Ud/1Bn1JqII6nIZSIHk79B2Oc8ADy5/fy9vMvIIHAHsDY/QJLNWt TRr8Ht9LMVUkGVtEzn3Tgnp+RBMXOC53irhueDX/OopJf/O03DvDvmQWkXKFHG7X2r0L +YKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:cc:message-id:in-reply-to :references:subject:mime-version:content-type:x-original-sender :reply-to:precedence:mailing-list:list-id:x-spam-checked-in-group :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=6pLMY0ts71g1aVEXURkf8S3v1Cb/QjUDIp5qmK9KgHI=; b=GfnIYtUCQsiLw/q81Rl4TogGdBGzlVt/ElEdLTAV8Od0UG9gnjB/KbgUVNaX2wCBUa XGQdJuAokcGqKCUrlU4VtMHLFUKe/X8O72NhkDFD48/bBKJjXIyb2DzIiA76AxGwUOD0 Fdzc4PbiDkMa6qsHYWLJEHK8IMzI+BIhiWBprZMRrjz/3i1Jx1K27vYVAzGKH9VvLazA 7hWJQG+jD4SGRHbaPkVUQOT3hK871bvJb31qiZ9dwBHvQN0XoS8G2PbS+voE3ZnJh2MX xWjS1rjB74lMRTkx87iVDTkYc+4HQRW8PisTlf1gWvSVbpi9WPZlyHT0Qelx7xroHOq3 o0jQ== X-Gm-Message-State: ALoCoQkOtyDwfNw1c9MdO+p2oTZa9xdYGcbuG4TOnL11ZjPeSs6RQA/+ZuUaePRfPRv/SVStji9G X-Received: by 10.66.63.39 with SMTP id d7mr11164330pas.20.1443298301049; Sat, 26 Sep 2015 13:11:41 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.164.164 with SMTP id yr4ls500146igb.27.canary; Sat, 26 Sep 2015 13:11:40 -0700 (PDT) X-Received: by 10.50.79.136 with SMTP id j8mr91997igx.16.1443298300216; Sat, 26 Sep 2015 13:11:40 -0700 (PDT) In-Reply-To: X-Original-Sender: joewoodbury@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:20842 Archived-At: ------=_Part_4021_641098898.1443298299612 Content-Type: multipart/alternative; boundary="----=_Part_4022_267548149.1443298299612" ------=_Part_4022_267548149.1443298299612 Content-Type: text/plain; charset=UTF-8 I hang my head in shame. Need to think more before posting. On Tuesday, September 22, 2015 at 7:53:07 PM UTC-7, Nicol Bolas wrote: > > > > On Tuesday, September 22, 2015 at 8:34:20 PM UTC-4, joewo...@gmail.com > wrote: >> >> Here in interesting example I just encountered: >> >> strLen is passed into a function along with pStr. After nullptr checks, >> the following is done: >> >> size_t tmpStrLen = wcslen(pStr); >> if (strLen > tmpStrLen) >> strLen = tmpStrLen; >> >> Using the ?: operator, you could do: >> >> strLen = wcslen(pStr) < strLen ?: strLen; >> >> Again, a trivial example, but one in actual code. >> > > And this code would have made it much more clear what you were doing: > > strLen = std::min(wcslen(pStr), strLen); > > Also, I'm not sure how your suggestion is equivalent to the original. I > see you have an expression that evaluates to bool. And I see you have an > expression which will be evaluated if the boolean expression is true. > > I don't see what the value of that expression will be if the boolean > expression is false. So I'm not clear on exactly what your code means. > -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. ------=_Part_4022_267548149.1443298299612 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I hang my head in shame. Need to think more before posting= ..

On Tuesday, September 22, 2015 at 7:53:07 PM UTC-7, Nicol Bolas wr= ote:


O= n Tuesday, September 22, 2015 at 8:34:20 PM UTC-4, joewo...@gmail.com wrote:
Here in in= teresting example I just encountered:

strLen is passed into a functi= on along with pStr. After nullptr checks, the following is done:

=C2= =A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 size_t tmpStrLen =3D = wcslen(pStr);
=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 i= f (strLen > tmpStrLen)
=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0= =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 strLen =3D tmpStrLen;

Using the ?: o= perator, you could do:

=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0= =C2=A0=C2=A0 strLen =3D wcslen(pStr) < strLen ?: strLen;

Again, a= trivial example, but one in actual code.

And this code would have made it much more clear what you were do= ing:

strLen =3D std::min= (wcslen= (pStr),= strLen= );

Also,= I'm not sure how your suggestion is equivalent to the original. I see = you have an expression that evaluates to bool. And I see you have an expres= sion which will be evaluated if the boolean expression is true.

I do= n't see what the value of that expression will be if the boolean expres= sion is false. So I'm not clear on exactly what your code means.

--

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