220 25372 article Path: news.gmane.org!not-for-mail From: Andrei L Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: constexpr if, and a little bit more control over constexpr. 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[2607:f8b0:4003:c01::231]) by mx.google.com with ESMTPS id x40si3084769otx.232.2016.03.30.08.20.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Mar 2016 08:20:52 -0700 (PDT) Received-SPF: pass (google.com: domain of aendaerel@gmail.com designates 2607:f8b0:4003:c01::231 as permitted sender) client-ip=2607:f8b0:4003:c01::231; Original-Received: by mail-ob0-x231.google.com with SMTP id m7so68022887obh.3 for ; Wed, 30 Mar 2016 08:20:52 -0700 (PDT) X-Received: by 10.182.125.100 with SMTP id mp4mr1593569obb.24.1459351246296; Wed, 30 Mar 2016 08:20:46 -0700 (PDT) Original-Received: by 10.202.75.198 with HTTP; Wed, 30 Mar 2016 08:20:46 -0700 (PDT) In-Reply-To: <1fdbd2bc-9f4d-479c-b987-028ef4a32d15@isocpp.org> X-Original-Sender: aendaerel@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of aendaerel@gmail.com designates 2607:f8b0:4003:c01::231 as permitted sender) smtp.mailfrom=aendaerel@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:25372 Archived-At: --089e013cb802a35f9c052f45b062 Content-Type: text/plain; charset=UTF-8 2016-03-30 14:04 GMT+05:00 : > Would that be allowed to work on constexpr function parameters? I think it's not, because its purpose is to *request* a guarantee that there will be no run-time. constexpr int foo (int x) { constexpr int j = constexpr (x); return bar(j); } In this case, it is impossible to guarantee that 'x' always will be constexpr, and i don't think that this is the right way to specify constexpr-only function. -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CANaLnBrZFUKbUD_90-9O_OX7waZpa1N9YtA_pNOnux00H8qUCw%40mail.gmail.com. --089e013cb802a35f9c052f45b062 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

= 2016-03-30 14:04 GMT+05:00 <bruno.manga95@gmail.com>:=
Would that be allowed= to work on constexpr function parameters?

I think it's not, because its purpose is to r= equest a guarantee that there will be no run-time.

constexpr int foo (int x)
{
=C2=A0 =C2=A0 =C2=A0constexpr int j =3D constexpr (= x);
=C2= =A0 =C2=A0 =C2=A0return bar(j);
<= code>}
=

In this case, it is impos= sible to guarantee that 'x' always will be constexpr, and i don'= ;t think that this is the right way to specify constexpr-only function.
=

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