220 5913 <CAGg_6+PX_CJ3277QuokXLnryEka9t_RBmOcRYcYn9Xm-6YNHmQ@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: Tue, 27 Aug 2013 20:15:59 -0500
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On 27 August 2013 18:17, Nicol Bolas <jmckesson@gmail.com> wrote:

> Because it's part of std::vector's interface. std::vector *requires* that
> this code works:
>
> vector<T> t{...};
> T* tp = &t[0];
> tp += 3;
> *tp == t[3];
>
> And that will work for all T... so long as T is not `bool`.
>
> It is not for you to decide whether this is good code or not.
>

And even of people don't like that code, surely the following is reasonable:

void DoSomething(bool& flag) { /* ... */ }

DoSomething(t[3]);
-- 
 Nevin ":-)" Liber  <mailto:nevin@eviloverlord.com>  (847) 691-1404

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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On 27 August 2013 18:17, Nicol Bolas <span dir=3D"ltr">&lt;<a href=3D"mailt=
o:jmckesson@gmail.com" target=3D"_blank">jmckesson@gmail.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>Because it&#39;s part of std::vector&#3=
9;s interface. std::vector *requires* that this code works:<br><br><div sty=
le=3D"background-color:rgb(250,250,250);border-color:rgb(187,187,187);borde=
r-style:solid;border-width:1px;word-wrap:break-word">

<code><div><span style>vector</span><span style=3D"color:#660">&lt;</span><=
span style>T</span><span style=3D"color:#660">&gt;</span><span style> t</sp=
an><span style=3D"color:#660">{...};</span><span style><br>T</span><span st=
yle=3D"color:#660">*</span><span style> tp </span><span style=3D"color:#660=
">=3D</span><span style> </span><span style=3D"color:#660">&amp;</span><spa=
n style>t</span><span style=3D"color:#660">[</span><span style=3D"color:#06=
6">0</span><span style=3D"color:#660">];</span><span style><br>

tp </span><span style=3D"color:#660">+=3D</span><span style> </span><span s=
tyle=3D"color:#066">3</span><span style=3D"color:#660">;</span><span style>=
<br></span><span style=3D"color:#660">*</span><span style>tp </span><span s=
tyle=3D"color:#660">=3D=3D</span><span style> t</span><span style=3D"color:=
#660">[</span><span style=3D"color:#066">3</span><span style=3D"color:#660"=
>];</span></div>

</code></div><br>And that will work for all T... so long as T is not `bool`=
..<br><br>It is not for you to decide whether this is good code or not. </di=
v></blockquote><div><br></div><div>And even of people don&#39;t like that c=
ode, surely the following is reasonable:</div>

<div><br></div><div>void DoSomething(bool&amp; flag) { /* ... */ }</div><di=
v><br></div><div>DoSomething(t[3]);</div><div>--=A0<br></div></div>=A0Nevin=
 &quot;:-)&quot; Liber=A0 &lt;mailto:<a href=3D"mailto:nevin@eviloverlord.c=
om" target=3D"_blank">nevin@eviloverlord.com</a>&gt;=A0 (847) 691-1404
</div></div>

<p></p>

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