Re: [boost] [range] Proposal: addition of front(), back(), at(), operator[]

Subject: Re: [boost] [range] Proposal: addition of front(), back(), at(), operator[]
From: Eric Niebler (eniebler_at_[hidden])
Date: 2014-03-26 12:50:16

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On 03/25/2014 01:50 PM, Marshall Clow wrote:
> 
> On Mar 24, 2014, at 10:36 AM, Marshall Clow <mclow.lists_at_[hidden]>
> wrote:
>> Interesting. I think that in C++14, the committee put that
>> possibility to bed. See LWG issue 2360
>> http://cplusplus.github.io/LWG/lwg-defects.html#2360
>> 
>> I’ll open an issue that gets that cleared up.
> 
> Thinking about this some more, I think that “may” is the key
> there.
> 
> [forward.iterators] says: • 6  If a and b are both dereferenceable,
> then a == b if and only if *a and *b are bound to the same object.
> 
> which disallows “stashing iterators” for forward (or greater)
> iterators.
> 
> So, I think that [iterator.requirements.general] 9 can only really
> be true for input iterators.

That's always been my understanding.

\e

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