220 33191 <df32b9a3-9215-4517-9bba-ba42654c55ee@isocpp.org> article
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From: Nicol Bolas <jmckesson@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: [idea for proposal] Adding std::shift to <algorithm>
Date: Wed, 12 Jul 2017 12:51:23 -0700 (PDT)
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On Wednesday, July 12, 2017 at 3:11:27 PM UTC-4, Dan Raviv wrote:
>
> Indeed, circular shift is just std::rotate.
>
> For the 'logical' shift,  I was thinking leaving them in the moved-from 
> state. Filling them with some value would both 1) have a cost 2) not 
> necessarily be desired.
>

But logical bitshifts do fill in a specific, well-defined value. So if this 
is going to be separate from `move[_backward]`, then it ought to have the 
behavior a user would expect.

So I'm for the same behavior as the equivalent std::move[_backward], at 
> least by default.
>

> It is possible to add an optional fill-in value parameter, if that's 
> something that would be deemed useful enough.
>

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<div dir=3D"ltr">On Wednesday, July 12, 2017 at 3:11:27 PM UTC-4, Dan Raviv=
 wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.=
8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr">Indeed=
, circular shift is just std::rotate.<div><br></div><div>For the &#39;logic=
al&#39; shift, =C2=A0I was thinking leaving them in the moved-from state. F=
illing them with some value would both 1) have a cost 2) not necessarily be=
 desired.</div></div></blockquote><div><br>But logical bitshifts do fill in=
 a specific, well-defined value. So if this is going to be separate from `m=
ove[_backward]`, then it ought to have the behavior a user would expect.<br=
><br></div><blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left=
: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir=3D"ltr"><d=
iv>So I&#39;m for the same behavior as the equivalent std::move[_backward],=
 at least by default.</div></div></blockquote><div></div><blockquote class=
=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #cc=
c solid;padding-left: 1ex;"><div dir=3D"ltr"><div><br></div><div>It is poss=
ible to add an optional fill-in value parameter, if that&#39;s something th=
at would be deemed useful enough.</div></div></blockquote><br></div>

<p></p>

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