220 5865 <746c67e3-a702-4ca0-b009-9710832355fc@isocpp.org> article
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From: Nicol Bolas <jmckesson@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Remove vector<bool>?
Date: Mon, 26 Aug 2013 23:38:31 -0700 (PDT)
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On Monday, August 26, 2013 4:18:07 PM UTC-7, Zhihao Yuan wrote:
>
> On Mon, Aug 26, 2013 at 7:10 PM, Nicol Bolas <jmck...@gmail.com<javascript:>> 
> wrote: 
> > `bit_vector` can do whatever it wants, because it's not a real vector. 
> It 
> > can spit out "pseudo-iterators". It can do whatever. It can have the 
> > interface it has, and nobody has any explicit expectations that this 
> > interface matches that of the containers as defined by chapter 23. 
>
> So you mean it's Okey for bitvector's begin() to produce an 
> object which can be used in any STL algorithms but such an object 
> fits into no iterator categories?  Don't you think that's an anti-pattern 
> of STL design?
>

No. Because it is not defined in accord with the requirements of the 
container concepts, it can do whatever it wants. Including look enough like 
a container to pass as one. Sometimes.

If you want to go through and change the iterator concepts to make it 
actually be a legitimate container, fine. But that shouldn't be a *
requirement* for starting us the process of getting a real `vector<bool>` 
that's a real `vector` of real `bool`. And that process requires us to 
provide a drop-in replacement of the current class.

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<div dir=3D"ltr">On Monday, August 26, 2013 4:18:07 PM UTC-7, Zhihao Yuan w=
rote:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8e=
x;border-left: 1px #ccc solid;padding-left: 1ex;">On Mon, Aug 26, 2013 at 7=
:10 PM, Nicol Bolas &lt;<a href=3D"javascript:" target=3D"_blank" gdf-obfus=
cated-mailto=3D"5sw8y2aNJI0J">jmck...@gmail.com</a>&gt; wrote:
<br>&gt; `bit_vector` can do whatever it wants, because it's not a real vec=
tor. It
<br>&gt; can spit out "pseudo-iterators". It can do whatever. It can have t=
he
<br>&gt; interface it has, and nobody has any explicit expectations that th=
is
<br>&gt; interface matches that of the containers as defined by chapter 23.
<br>
<br>So you mean it's Okey for bitvector's begin() to produce an
<br>object which can be used in any STL algorithms but such an object
<br>fits into no iterator categories? &nbsp;Don't you think that's an anti-=
pattern
<br>of STL design?<br></blockquote><div><br>No. Because it is not defined i=
n accord with the requirements of the container concepts, it can do whateve=
r it wants. Including look enough like a container to pass as one. Sometime=
s.<br><br>If you want to go through and change the iterator concepts to mak=
e it actually be a legitimate container, fine. But that shouldn't be a <i>r=
equirement</i> for starting us the process of getting a real `vector&lt;boo=
l&gt;` that's a real `vector` of real `bool`. And that process requires us =
to provide a drop-in replacement of the current class.<br></div></div>

<p></p>

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