220 4660 <CAOHCbitnBnOvzg3zHjjHB3659yyuQ7BU7JcTEVvfC6MbhR0KBQ@mail.gmail.com> article
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From: Tony V E <tvaneerd@gmail.com>
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Subject: Re: Remove vector<bool>?
Date: Tue, 28 May 2013 12:32:21 -0400
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On Tue, May 28, 2013 at 12:17 PM, Nevin Liber <nevin@eviloverlord.com>wrote:

> On 28 May 2013 10:50, Zhihao Yuan <lichray@gmail.com> wrote:
>
>> I saw Herb's paper:
>>
>>   http://www.gotw.ca/publications/N1185.pdf
>>
>> But it's not adopted.
>>
>> Anyway, vector<bool> sucks, and we know it.  How about to entirely
>> remove it?
>>
>
> That could be a silent breaking change to potentially a lot of users; I
> would be against that.  Export notwithstanding, we don't just pull things
> out of the standard.
>
> If someone were to propose making it deprecated in C++17, I could be for
> that.
>
> Because this is a breaking change, I would like to see such a proposal
> talk about the practical use cases for having a vector<bool> that was just
> another instance of vector.  What are the useful things that cannot be done
> / cannot be done efficiently now with vector<bool>.
> --
>  Nevin ":-)" Liber  <mailto:nevin@eviloverlord.com>  (847) 691-1404
>
> --
>
>

Yes, the real trick is that we don't really want to remove vector<bool>, we
just want to remove its specialization.  A vector<bool> that was a, well,
vector of bools, would be great, but how do we get from here to there?

Tony

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Tue, May 28, 2013 at 12:17 PM, Nevin Liber <span dir=3D"ltr">&lt=
;<a href=3D"mailto:nevin@eviloverlord.com" target=3D"_blank">nevin@evilover=
lord.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On 28 May 2013 10:50, Zhih=
ao Yuan <span dir=3D"ltr">&lt;<a href=3D"mailto:lichray@gmail.com" target=
=3D"_blank">lichray@gmail.com</a>&gt;</span> wrote:<br>
</div><div class=3D"gmail_quote"><div class=3D"im"><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">

I saw Herb&#39;s paper:<br>
<br>
=A0 <a href=3D"http://www.gotw.ca/publications/N1185.pdf" target=3D"_blank"=
>http://www.gotw.ca/publications/N1185.pdf</a><br>
<br>
But it&#39;s not adopted.<br>
<br>
Anyway, vector&lt;bool&gt; sucks, and we know it. =A0How about to entirely<=
br>
remove it?<br></blockquote></div><div><br>That could be a silent breaking c=
hange to potentially a lot of users; I would be against that.=A0 Export not=
withstanding, we don&#39;t just pull things out of the standard.<br><br>
If someone were to propose making it deprecated in C++17, I could be for th=
at.<br>

<br>Because this is a breaking change, I would like to see such a proposal =
talk about the practical use cases for having a vector&lt;bool&gt; that was=
 just another instance of vector.=A0 What are the useful things that cannot=
 be done / cannot be done efficiently now with vector&lt;bool&gt;.<span cla=
ss=3D"HOEnZb"><font color=3D"#888888"><br clear=3D"all">


</font></span></div></div><span class=3D"HOEnZb"><font color=3D"#888888">--=
 <br>=A0Nevin &quot;:-)&quot; Liber=A0 &lt;mailto:<a href=3D"mailto:nevin@e=
viloverlord.com" target=3D"_blank">nevin@eviloverlord.com</a>&gt;=A0 <a hre=
f=3D"tel:%28847%29%20691-1404" value=3D"+18476911404" target=3D"_blank">(84=
7) 691-1404</a></font></span><div class=3D"HOEnZb">
<div class=3D"h5">

<p></p>

-- <br>=A0
<br></div></div></blockquote><div><br></div><div>Yes, the real trick is tha=
t we don&#39;t really want to remove vector&lt;bool&gt;, we just want to re=
move its specialization.=A0 A vector&lt;bool&gt; that was a, well, vector o=
f bools, would be great, but how do we get from here to there?<br>
<br></div><div>Tony<br>=A0<br></div></div></div></div>

<p></p>

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