220 40248 article Path: news.gmane.org!.POSTED!not-for-mail From: Daniel Gutson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::between ? 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[209.85.220.41]) by mx.google.com with SMTPS id p64-v6sor3301154ljp.39.2018.09.28.07.31.55 for (Google Transport Security); Fri, 28 Sep 2018 07:31:55 -0700 (PDT) Received-SPF: pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:a2e:4584:: with SMTP id s126-v6mr11568590lja.60.1538145115208; Fri, 28 Sep 2018 07:31:55 -0700 (PDT) In-Reply-To: X-Original-Sender: danielgutson@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=eblVahDq; spf=pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=danielgutson@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE 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:40248 Archived-At: --0000000000003483390576ef5198 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 >> comparison, and a cast-to-bool operator. >> >> if (chain(3) < x < 4) >> > > So, something similar to the solution I provided? As I said, that > solution would probably result in possible unnecessary comparisons (no > logical short circuiting) > No, the chain object contains a boolean and the last right hand operand as its only state. It should do nothing after the boolean becomes false. and additional storage for bool propagation (though I've not looked at what > the optimizer would do). Would prolly be better to implement in the > language to avoid those issues, even if it is only syntactic sugar, as it > can make the code more readable. > > >> >> >> El jue., 27 de sep. de 2018 a la(s) 12:53, Addy (acl...@gmail.com) >> 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 >>> 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!? >>> >>> -- >>> 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-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/7b85d688-9= 013-407d-b7d3-10d28494e960%40isocpp.org >>> >>> . >>> >> >> >> -- >> 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? >> > -- > 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/b917d650-33b= 0-459d-bba0-c0f03bc4db8d%40isocpp.org > > . > --=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/CAFdMc-2%3D92DEL46jYrGPwESnUkwbYdrrWs%3DSfL3woc9= A4H%2B6jQ%40mail.gmail.com. --0000000000003483390576ef5198 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


= El vie., 28 sept. 2018 11:26, Jack Adrian Zappa <adrian.hawryluk@gmail.com> escribi=C3=B3:
<= /div>


On Friday, Sep= tember 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 allo= ws 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 comparisons (no logi= cal short circuiting)

No, the chain object contains a boolean and t= he last right hand operand as its only state. It should do nothing after th= e boolean becomes false.


and additional storage for bool propaga= tion (though I've not looked at what the optimizer would do).=C2=A0 Wou= ld prolly be better to implement in the language to avoid those issues, eve= n if it is only syntactic sugar, as it can make the code more readable.
=C2=A0


El ju= e., 27 de sep. de 2018 a la(s) 12:53, Addy (= acl...@gmail.com) escribi=C3=B3:
I do this pattern often:

if (0 < x= && x < 100)

And would love a simple `s= td::between()` that would take two arguments and an optional third (compare= function) argument.

Similar to this:=C2=A0https://gist.github.com/martinmoene/9410391

templated<typename T, typename Compare>
bool std::between(T lower, T upper, Compare comp)
{
= =C2=A0 =C2=A0 return comp(lower) && comp(upper);
}
<= div>
Does anything like this exist? Should I propose it!?

--
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/7b85d688-9013-407d-b7d3-10d28494e960%40isocpp.org.


--
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-proposals+unsubscribe@isocpp.org.
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--
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