Re: [boost] AlRangeExandrescu?

Subject: Re: [boost] AlRangeExandrescu?
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2009-07-26 03:55:07

Andrei Alexandrescu skrev:
> Thorsten Ottosen wrote:

>> A "not" slipped here.
>>
>>> Yes, until is lazy. I think it couldn't be implemented any other way 
>>> for input ranges.
>>
>> Ok, but the problem with lazy ranges is that when you compose it with
>> range adaptors, then it greatly limits the adaptors that you can 
>> subsequently apply.
> 
> Why is that the case?

because some adapters require random aceesss ranges e.g.

  rng | stride_view

and some requires bidirectionsal ranges e.g.

  rng | reverse_view

-Thorsten