Re: [Boost-users] Iterator Range, sub range of a desired size

Subject: Re: [Boost-users] Iterator Range, sub range of a desired size
From: Nathan Ridge (zeratul976_at_[hidden])
Date: 2012-10-30 15:12:23

> // General solution for all iterator types - assume that source here is  
> v from your example 
> auto r = boost::make_iterator_range( 
>      boost::next(boost::begin(source), start - 1), 
>      boost::next(boost::begin(source), std::min(start - 1 + window,  
> static_cast<int>(boost::distance(source)))) 
> ); 
>  
> I'm not seeing a problem. Am I misunderstanding your question? 

The call to distance() will iterate over the range if it's not random-access
(or worse, if it's an input range, it will consume it!).
A hand-crafted solution could avoid this.

Regards,
Nate