Re: [boost] [range] Should ranges really propagate constess to the data ?

Subject: Re: [boost] [range] Should ranges really propagate constess to the data ?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2011-07-23 13:13:58

On 07/23/2011 05:13 PM, Dave Abrahams wrote:
>
> on Fri Jul 22 2011, Samuel Debionne<debionne-AT-hydrowide.com>  wrote:
>
>> Hello everyone,
>> Here is an example code that motivates my question :
>
> <snip>
>
> Well, if we want something like std::vector to be a Range, then we have
> to accept that at least *some* Ranges do propagate constness.  And I'm
> pretty sure that we don't want other Ranges (std::pair<char*,char*>) to
> propagate constness.  So unless the documentation says otherwise, I
> would assume that the concept doesn't say anything about whether
> constness is propagated.  If you want to write generic Range code you
> have to account for both cases.

Constness is propagated for containers, yes, but sub_range is not a 
container, it is a view of another range, so it should propagate the 
constness.