220 40259 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 y62-v6sor2335322lfd.14.2018.09.28.08.25.29 for (Google Transport Security); Fri, 28 Sep 2018 08:25:29 -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:a19:5e5d:: with SMTP id z29-v6mr10469621lfi.110.1538148328388; Fri, 28 Sep 2018 08:25:28 -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=EVrVJWvx; 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:40259 Archived-At: --000000000000b9c1560576f010f8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable El vie., 28 de sep. de 2018 a la(s) 12:18, Adrian H ( adrian.hawryluk@gmail.com) escribi=C3=B3: > > > On Friday, September 28, 2018 at 10:53:35 AM UTC-4, Daniel Gutson wrote: >> >> >> >> El vie., 28 de sep. de 2018 a la(s) 11:40, Adrian H (adrian....@gmail.co= m) >> escribi=C3=B3: >> >>> >>> >>> 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 wrot= e: >>>>>> >>>>>> 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 (n= o >>>>> logical short circuiting) >>>>> >>>> >>>> No, the chain object contains a boolean and the last right hand operan= d >>>> as its only state. It should do nothing after the boolean becomes fals= e. >>>> >>> >>> Could you provide your solution? I'd be interested in finding out how >>> you dealt with short circuiting. >>> >> >> Sure, I'm in a conference but I will do later. >> >> >>> Also, I take it that your solution wouldn't allow comparisons of >>> different types such as a double and a float, or would it convert all >>> objects to the type of first one chained? >>> >> >> Both the chain class and the comparison operators are templates. The >> result of the operator is a new (temporal) chain object with the templat= e >> argument deduced. Let me provide the code later. >> > > Cool. Still sounds very similar to what I posted: > Actually it is now that I read it more carefully: > > #include > #include > > template > struct chain_impl { > chain_impl(T&& obj, bool val) : obj(std::move(obj)), val(val) {} > T&& obj; > bool val; > explicit operator bool() { > return val; > } > }; > > template > struct chain_impl { > chain_impl(T& obj, bool val) : obj(obj), val(val) {} > T& obj; > bool val; > explicit operator bool() { > return val; > } > }; > > template > decltype(auto) make_chain(T&& obj, bool val =3D true) { > return chain_impl::value= , > T&, T&&>>(std::forward(obj), val); > } > > template > auto operator< (chain_impl&& lhs, T1&& rhs) { > if (lhs.val) { > Why you say that comparisons are performed? You are breaking the chain here with this evaluation. So yes, operator will keep be called, but it's just this if. > auto result =3D make_chain(rhs, lhs.obj < rhs); > return make_chain(std::forward(rhs), lhs.val && result.val); > } > return make_chain(std::forward(rhs), false); > } > > int main() > { > std::cout << (make_chain(1) < 2 < 3 ? 1 : 0) << "\n"; > int a=3D1, b=3D2, c=3D3; > std::cout << (make_chain(a) < c < b ? 1 : 0) << "\n"; > } > > Looking forward to seeing the difference. > > >> >> >>> >>> >>>> 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, a= s 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/7b85d6= 88-9013-407d-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, sen= d >>>>> 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/b917d650= -33b0-459d-bba0-c0f03bc4db8d%40isocpp.org >>>>> >>>>> . >>>>> >>>> -- >>> 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/52d6bd1b-4= afb-4f16-adde-8ee8b5ba1041%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/bacc5cd9-230= a-4865-858c-78566502cfef%40isocpp.org > > . > --=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 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-0wDSKSAGQFoj4GSBFyp1fD4jC4A_LrMw3k4%3Dnj2= jBRgQ%40mail.gmail.com. --000000000000b9c1560576f010f8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


El vie= .., 28 de sep. de 2018 a la(s) 12:18, Adrian H (adrian.hawryluk@gmail.com) escribi=C3=B3:


On Friday, September 2= 8, 2018 at 10:53:35 AM UTC-4, Daniel Gutson wrote:


El vie., 28 de sep. de 2018 a la(s) 11:40, Adrian H (adrian....@gmail.com) escribi=C3=B3:


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 <ad= rian....@gmail.com> 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 solv= ed is by creating a temporal object that allows chain comparison, and a cas= t-to-bool operator.

if (chain(3) < x < 4)=C2= =A0

So, something similar to th= e solution I provided?=C2=A0 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.
=

Could you provide your solution?=C2= =A0 I'd be interested in finding out how you dealt with short circuitin= g.=C2=A0

Sure, I'm in a co= nference but I will do later.
=C2=A0
Also, I take it that your solution wouldn'= ;t allow comparisons of different types such as a double and a float, or wo= uld it convert all objects to the type of first one chained?=C2=A0

Both the chain class and the comparison= operators are templates. The result of the operator is a new (temporal) ch= ain object with the template argument deduced. Let me provide the code late= r.=C2=A0

Cool.=C2=A0 Stil= l sounds very similar to what I posted:

Actually it is now that I read it more carefully:
=C2=A0=

<= font face=3D"monospace, monospace">#include <iostream>
#include <type_traits><= /div>

template<typename T>
struct chain_impl {
=C2=A0 chain_impl(T&& obj, bool val= ) : obj(std::move(obj)), val(val) {}
=C2=A0 T&& obj;
=C2=A0 bool val;
=C2=A0 explicit operator bool() {
=C2=A0 =C2=A0 =C2=A0 return val;
=C2=A0 }
};

template&l= t;typename T>
struc= t chain_impl<T&> {
=C2=A0 chain_impl(T& obj, bool val) : obj(obj), val(val) {}
=C2=A0 T& obj;<= /div>
=C2=A0 bool val;
=
=C2=A0 explicit operator bool() {<= /font>
=C2=A0 =C2=A0 =C2=A0 r= eturn val;
=C2=A0 }
};

template <typename T>
decltype(auto) make_chain(T&&=C2=A0 obj, bool = val =3D true) {
=C2=A0= return chain_impl<std::conditional_t<std::is_lvalue_reference<T&g= t;::value, T&, T&&>>(std::forward<T>(obj), val);
}

template <typename T0, typename T1>
auto operator< (chain_impl<T0>&a= mp;& lhs, T1&& rhs) {
=C2=A0 =C2=A0 if (lhs.val) {

Why you say that comparisons are performed? You are breaki= ng the chain here with this evaluation. So yes, operator will keep be calle= d, but it's just this if.
=C2=A0
=C2=A0 = =C2=A0 =C2=A0 =C2=A0 auto result =3D make_chain(rhs, lhs.obj < rhs);
=C2=A0 =C2=A0 =C2=A0 =C2= =A0 return make_chain(std::forward<T1>(rhs), lhs.val && resul= t.val);
=C2=A0 =C2=A0 = }
=C2=A0 =C2=A0 return= make_chain(std::forward<T1>(rhs), false);
}

int main()=
{
=C2=A0 std::cout << (make_chain(1) = < 2 < 3 ? 1 : 0) << "\n";
=C2=A0 int a=3D1, b=3D2, c=3D3;
=C2=A0 std::cout <&l= t; (make_chain(a) < c < b ? 1 : 0) << "\n";
}
=
Looking forward to seeing the difference.
=C2=A0
=C2=A0


<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">
and additional storage = for bool propagation (though I've not looked at what the optimizer woul= d do).=C2=A0 Would prolly be better to implement in the language to avoid t= hose issues, even if it is only syntactic sugar, as it can make the code mo= re readable.
=C2=A0


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 option= al third (compare function) argument.


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-proposa= ls/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-proposal...@isocpp.org.
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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?

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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 temperam= ent?
Who's never wrong but always right?
Who'd never dream of= starting a fight?
Who get stuck with all the bad luck?

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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 h= ttps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAFdMc-0wDSKSAG= QFoj4GSBFyp1fD4jC4A_LrMw3k4%3Dnj2jBRgQ%40mail.gmail.com.
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