220 4735 <CAGg_6+Ou+4rwxx6NFLCZRUijc6J-GHqN_vHbaKA+UELM=WETfg@mail.gmail.com> article
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From: Nevin Liber <nevin@eviloverlord.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Remove vector<bool>?
Date: Wed, 29 May 2013 17:15:48 -0500
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On 29 May 2013 17:07, Zhihao Yuan <lichray@gmail.com> wrote:

>
> When I say "optimization words" I mean the words those break the
> container natural to allow the optimization.  If you remove the those
> words,
> the optimization is disabled.  The real users can longer count on it.
>

If this breaks users of C++14 vector<bool>, then it is a non-starter for
C++17.


> That's my initial thought.  I don't like to bother vector<T>, either (
> although it does not pollute the actual interfaces).  But the problem
> is, how to address the "current users"?
>

With a new class that has the optimizations Howard talked about, as well as
a transition period of (at least) one standard cycle where the old behavior
of vector<bool> is deprecated but doesn't change.
-- 
 Nevin ":-)" Liber  <mailto:nevin@eviloverlord.com>  (847) 691-1404

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On 29 May 2013 17:07, Zhihao Yuan <span dir=3D"ltr">&lt;<a href=3D"mailto:l=
ichray@gmail.com" target=3D"_blank">lichray@gmail.com</a>&gt;</span> wrote:=
<br><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div class=3D"im"><br>
</div>When I say &quot;optimization words&quot; I mean the words those brea=
k the<br>
container natural to allow the optimization. =A0If you remove the those wor=
ds,<br>
the optimization is disabled. =A0The real users can longer count on it.<br>=
</blockquote><div><br>If this breaks users of C++14 vector&lt;bool&gt;, the=
n it is a non-starter for C++17.<br>=A0</div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>


<div class=3D"im">That&#39;s my initial thought. =A0I don&#39;t like to bot=
her vector&lt;T&gt;, either (<br></div>
although it does not pollute the actual interfaces). =A0But the problem<br>
is, how to address the &quot;current users&quot;?<br></blockquote><div><br>=
With a new class that has the optimizations Howard talked about, as well as=
 a transition period of (at least) one standard cycle where the old behavio=
r of vector&lt;bool&gt; is deprecated but doesn&#39;t change. <br>

</div></div>-- <br>=A0Nevin &quot;:-)&quot; Liber=A0 &lt;mailto:<a href=3D"=
mailto:nevin@eviloverlord.com" target=3D"_blank">nevin@eviloverlord.com</a>=
&gt;=A0 (847) 691-1404

<p></p>

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