220 40250 <52d6bd1b-4afb-4f16-adde-8ee8b5ba1041@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Adrian H Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::between ? 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Fri, 28 Sep 2018 07:40:30 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a81:fd7:: with SMTP id 206-v6ls2248719ywp.5.gmail; Fri, 28 Sep 2018 07:40:30 -0700 (PDT) X-Received: by 2002:a81:7bd7:: with SMTP id w206-v6mr168665ywc.3.1538145629668; Fri, 28 Sep 2018 07:40:29 -0700 (PDT) In-Reply-To: X-Original-Sender: adrian.hawryluk@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:40250 Archived-At: ------=_Part_382_1530680004.1538145629083 Content-Type: multipart/alternative; boundary="----=_Part_383_935225925.1538145629083" ------=_Part_383_935225925.1538145629083 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Friday, September 28, 2018 at 10:31:57 AM UTC-4, Daniel Gutson wrote: > > > > El vie., 28 sept. 2018 11:26, Jack Adrian Zappa > escribi=C3=B3: > >> >> >> On Friday, September 28, 2018 at 7:03:19 AM UTC-4, Daniel Gutson wrote: >>> >>> I stepped into this too many times. >>> One of the issues are the four < vs <=3D combinations. >>> >>> The way I solved is by creating a temporal object that allows chain=20 >>> comparison, and a cast-to-bool operator. >>> >>> if (chain(3) < x < 4)=20 >>> >> >> So, something similar to the solution I provided? As I said, that=20 >> solution would probably result in possible unnecessary comparisons (no= =20 >> logical short circuiting)=20 >> > > No, the chain object contains a boolean and the last right hand operand a= s=20 > its only state. It should do nothing after the boolean becomes false. > Could you provide your solution? I'd be interested in finding out how you= =20 dealt with short circuiting. Also, I take it that your solution wouldn't= =20 allow comparisons of different types such as a double and a float, or would= =20 it convert all objects to the type of first one chained?=20 > and additional storage for bool propagation (though I've not looked at=20 >> what the optimizer would do). Would prolly be better to implement in th= e=20 >> language to avoid those issues, even if it is only syntactic sugar, as i= t=20 >> can make the code more readable. >> =20 >> >>> >>> >>> El jue., 27 de sep. de 2018 a la(s) 12:53, Addy (acl...@gmail.com)=20 >>> escribi=C3=B3: >>> >>>> I do this pattern often: >>>> >>>> if (0 < x && x < 100) >>>> >>>> And would love a simple `std::between()` that would take two arguments= =20 >>>> and an optional third (compare function) argument. >>>> >>>> Similar to this: https://gist.github.com/martinmoene/9410391 >>>> >>>> templated >>>> bool std::between(T lower, T upper, Compare comp) >>>> { >>>> return comp(lower) && comp(upper); >>>> } >>>> >>>> Does anything like this exist? Should I propose it!? >>>> >>>> --=20 >>>> You received this message because you are subscribed to the Google=20 >>>> Groups "ISO C++ Standard - Future Proposals" group. >>>> To unsubscribe from this group and stop receiving emails from it, send= =20 >>>> an email to std-proposal...@isocpp.org. >>>> To post to this group, send email to std-pr...@isocpp.org. >>>> To view this discussion on the web visit=20 >>>> https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/7b85d688-= 9013-407d-b7d3-10d28494e960%40isocpp.org=20 >>>> >>>> . >>>> >>> >>> >>> --=20 >>> Who=E2=80=99s got the sweetest disposition? >>> One guess, that=E2=80=99s who? >>> Who=E2=80=99d never, ever start an argument? >>> Who never shows a bit of temperament? >>> Who's never wrong but always right? >>> Who'd never dream of starting a fight? >>> Who get stuck with all the bad luck?=20 >>> >> --=20 >> You received this message because you are subscribed to the Google Group= s=20 >> "ISO C++ Standard - Future Proposals" group. >> To unsubscribe from this group and stop receiving emails from it, send a= n=20 >> email to std-proposal...@isocpp.org . >> To post to this group, send email to std-pr...@isocpp.org . >> To view this discussion on the web visit=20 >> https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/b917d650-33= b0-459d-bba0-c0f03bc4db8d%40isocpp.org=20 >> >> . >> > --=20 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 e= mail 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/52d6bd1b-4afb-4f16-adde-8ee8b5ba1041%40isocpp.or= g. ------=_Part_383_935225925.1538145629083 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Friday, September 28, 2018 at 10:31:57 AM UTC-4= , Daniel Gutson wrote:


El vie.,= 28 sept. 2018 11:26, Jack Adrian Zappa <adrian....@gmail.com> escrib= i=C3=B3:


O= n Friday, September 28, 2018 at 7:03:19 AM UTC-4, Daniel Gutson wrote:
I stepped into this too= many times.
One of the issues are the four < vs <=3D combination= s.

The way I solved is by creating a temporal obje= ct that allows chain comparison, and a cast-to-bool operator.
if (chain(3) < x < 4)=C2=A0
=
So, something similar to the solution I provided?=C2=A0 As I= said, that solution would probably result in possible unnecessary comparis= ons (no logical short circuiting)

No, the chain object contains a b= oolean and the last right hand operand as its only state. It should do noth= ing after the boolean becomes false.

Could you provide your solution?=C2=A0 I'd be interested in findi= ng out how you dealt with short circuiting.=C2=A0 Also, I take it that your= solution wouldn't allow comparisons of different types such as a doubl= e and a float, or would it convert all objects to the type of first one cha= ined?=C2=A0


and = additional storage for bool propagation (though I've not looked at what= the optimizer would do).=C2=A0 Would prolly be better to implement in the = language to avoid those issues, even if it is only syntactic sugar, as it c= an make the code more readable.
=C2=A0


El jue., 27 de sep. de 2018 a la(s) 12:53, Ad= dy (acl...@gmail.com) escribi=C3=B3:
=
I do this pattern oft= en:

if (0 < x && x < 100)

And would love a simple `std::between()` that would take two argum= ents and an optional third (compare function) argument.


--
Who=E2=80=99s got the sweetest disposition?
One guess, that=E2=80=99s w= ho?
Who=E2=80=99d never, ever start an argument?
Who never shows a bi= t of temperament?
Who's never wrong but always right?
Who'd n= ever dream of starting a fight?
Who get stuck with all the bad luck?

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposal...@isocpp.org.
To post to this group, send email to std-pr...@isocpp.org.
To view this discussion on the web visit https://groups.google.com= /a/isocpp.org/d/msgid/std-proposals/b917d650-33b0-459d-bba0-= c0f03bc4db8d%40isocpp.org.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+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/52d6bd1b-4afb-4f16-adde-8ee8b5ba1041= %40isocpp.org.
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