[boost] Re: [range] update on ADL hooks

From: Eric Niebler (eric_at_[hidden])
Date: 2005-03-24 14:55:19

David Abrahams wrote:
> "Thorsten Ottosen" <nesotto_at_[hidden]> writes:
> 
> 
>>"Eric Niebler" <eric_at_[hidden]> wrote in message 
>>news:4242F9E4.4090500_at_boost-consulting.com...
>>| Thorsten Ottosen wrote:
>>
>>| says, it suggests an association with the iterator_range<> type. But
>>| also, in my understanding, the Range concept is a bit more inclusive
>>| than merely "iterator ranges". A std container satisfies the Range
>>| concept, doesn't it?
>>
>>yes.
> 
> 
> In what sense is a standard container not an iterator range?
> 

You snipped the part of my message where I explain that:

<<
Consider iterator_range_size(). I could have a container that satisfies 
the range concept for which .size() is an O(1) operation, but 
std::distance( .begin(), .end() ) is O(N). What Big-O is suggested by 
"iterator_range_size()" when applied to one of those contaiers?
 >>

My point was, there are range operations that are not necessarily 
implemented in terms of lower-level operations on iterators, so the name 
"iterator_range_size()" might be misleading.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com