Re: [boost] [ptr_container] iterators bug

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2005-06-15 13:54:23

On Jun 15, 2005, at 11:58 AM, David Abrahams wrote:

> "Thorsten Ottosen" <nesotto_at_[hidden]> writes:
>
>> "David Abrahams" <dave_at_[hidden]> wrote in message
>> news:uk6kws88y.fsf_at_boost-consulting.com...
>>
>> | If someone would clearly and succinctly spell out the question, I'd 
>> be
>> | happy to.
>>
>> should one be able to add, subtract, and compare mutable random access
>> iterators with
>> random access const_iterators provided they point to the same 
>> container?
>
> There is no requirement that it be possible, and many early STL
> implementations failed to make it possible.  It's generally regarded
> as a poor QOI that doesn't allow it.  That capability is one of the
> things that iterator_facade and iterator_adaptor make easy.

Umm... and you helped me with the wording to require this for C++0X (it 
is already in the WP):

http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179

-Howard