Re: [boost] [iterators] Iterator Operations

From: Shunsuke Sogame (mb2act_at_[hidden])
Date: 2006-11-23 18:53:45

Sebastian Redl wrote:
> Shunsuke Sogame wrote:
>> FWIW, it seems the new Concept Check library is under construction (cvs
>> head).
>>   
> Hmm ... if it's scheduled for 1.35 then I'd better take a look.
>> Can't forward it to 'std::advance'?
>>   
>> Can't forward it to 'std::distance'?
>>   
> Good point. Possibly the std versions have some special knowledge about
> some iterators, too.
>> Can give the difference_type to 'detail::distance' by using
>> boost::type or explicit template parameter, which makes the code cute?
>>   
> I could, but does it actually make the code shorter or more readable? It
> doesn't seem like it to me.
>> IMHO, std::advance is conceptually redundant.
>>   
> How so? It's a useful utility for advancing non-random-access iterators
> more than one step quickly.
>> First <boost/next_prior.hpp> should be patched with your implementation
>> if possible?
>>   
> I'm not sure about that. Since they are utilities specifically for the
> new iterator concepts, I think they should go into the iterator library.

I prefer <boost/next_prior.hpp> to 'std::advance'.
That is nothing but a style(or optimization) issue, though.
<boost/next_prior.hpp> also can be patched with your 'advance'.

Regards,

-- 
Shunsuke Sogame