Re: [boost] [algorithm] adjacent_for_each interest?

Subject: Re: [boost] [algorithm] adjacent_for_each interest?
From: Evgeny Panasyuk (evgeny.panasyuk_at_[hidden])
Date: 2013-02-11 04:18:00

11.02.2013 3:09, Dave Abrahams:

>> In this regard your version at
>> https://github.com/irh/adjacent_for_each/blob/master/boost/algorithm/adjacent_for_each.hpp
>> is broken.
>> Because it advertises to work on InputIterator, but it dereferences
>> iterator at same position several times. As the result current
>> implementation is for ForwardIterator.
>
> That's incorrect.  The mental model for InputIterator is an ephemeral
> input stream *with a one-element backing buffer*.  You are allowed to
> dereference the same InputIterator multiple times at the same position
> until that iterator or a copy of it is incremented.

Thanks for correction, I should re-phrase my sentence as:
"but it dereferences iterator at same position several times *after 
passing to next and/or dereferencing it*" ( 
https://github.com/irh/adjacent_for_each/blob/382070171df195afb945f86db442a8634d8d136d/boost/algorithm/adjacent_for_each.hpp 
)

-- 
Evgeny Panasyuk