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From: Nevin Liber <nevin@eviloverlord.com>
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Subject: Re: Remove vector<bool>?
Date: Wed, 29 May 2013 16:47:45 -0500
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On 29 May 2013 16:21, Zhihao Yuan <lichray@gmail.com> wrote:

>
> What I don't understand it, what is the difference between removing
> the optimization words and removing the specialization +
> supporting vector<bool>'s extra interfaces in vector<T> when T == bool.
>

Because real users, and in all likelihood the majority of current users of
vector<bool>, count on the space optimization even though it isn't
normative, since that was most certainly the intent of the specialization.
We don't live in an ivory tower.

IMO, the correct "fix" is (1) address current users who need the space
optimization that vector<bool> provides, and (2) vector (and generic code
using vector) should neither know nor care that it is being instantiated
with a bool.  If that isn't where we are heading, I see no reason to mess
with either vector or vector<bool>.
-- 
 Nevin ":-)" Liber  <mailto:nevin@eviloverlord.com>  (847) 691-1404

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On 29 May 2013 16:21, 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>What I don&#39;t understand it, what is the difference between removi=
ng<br>
the optimization words and removing the specialization +<br>
supporting vector&lt;bool&gt;&#39;s extra interfaces in vector&lt;T&gt; whe=
n T =3D=3D bool.<br></blockquote><div><br>Because real users, and in all li=
kelihood the majority of current users of vector&lt;bool&gt;, count on the =
space optimization even though it isn&#39;t normative, since that was most =
certainly the intent of the specialization.=A0 We don&#39;t live in an ivor=
y tower.<br>

<br>IMO, the correct &quot;fix&quot; is (1) address current users who need =
the space optimization that vector&lt;bool&gt; provides, and (2) vector (an=
d generic code using vector) should neither know nor care that it is being =
instantiated with a bool.=A0 If that isn&#39;t where we are heading, I see =
no reason to mess with either vector or vector&lt;bool&gt;.<br clear=3D"all=
">

</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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