iter_swapping vector<bool>::iterator..

[Bo Persson]

----- Original Message ----- 
From: "Paolo Carlini" <pcarlini@suse.de>
To: "Chris Jefferson" <caj@cs.york.ac.uk>
Cc: "libstdc++" <libstdc++@gcc.gnu.org>
Sent: Friday, March 18, 2005 4:47 PM
Subject: Re: iter_swapping vector<bool>::iterator..


> Anyone knows whether other implementors are able to provide a 
> vector<bool>::iterator
> which meets the forward iterator requirements? Everything really boils 
> down to this,
> in my opinion.
>

That is just impossible!

The underlying problem is, of course, that a vector<bool> doesn't store 
any bools. When dereferencing an iterator into the container, you are 
supposed to get a reference to a bool. But there aren't any bools 
around...

Implementations can't fix this, only the committee can - by changing at 
least one of the rules. They just have to agree on which one!


Bo Persson