[boost] Re: [utility] question on prior(x,n)

From: David Abrahams (dave_at_[hidden])
Date: 2004-02-23 20:01:14

Bjorn.Karlsson_at_[hidden] writes:

>> From: David Abrahams [mailto:dave_at_[hidden]]
>> Hey!  These implementations using "advance" don't work for
>> non-iterators (e.g. int) the way regular next() and prior() do.  I
>> consider this a bug!
>
> Are there really use cases where implementations should work seamlessly for
> both non-iterators and iterators? Or are there (common) non-iterator types
> that share the iterators' "operator++() but not operator+()" issue? I
> understand the problem that next/prior solves for iterators, but when
> dealing with numeric types, I'm thinking there's always binary +/- operators
> available. 

See counting_iterator for inspiration as to why this might be useful.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com