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Subject: Re: [boost] AlRangeExandrescu?
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2009-07-26 19:46:23

Steven Watanabe skrev:
> Thorsten Ottosen wrote:

>>>> Why is that the case?
>>> and some requires bidirectionsal ranges e.g.
>>> rng | reverse_view
>> And also many later operations are usually more efficient when e.g.
>> random access is preserved.
> If only one form of the range adapters is provided, then
> the lazy form is better, because it is possible to implement
> the greedy version in terms of the lazy one, but not vice versa.

I think almost all the adaptors are lazy. But that is a somewhat
different issue than until() being lazy because until() will be used to
form the initial range that adaptors adapt. If until() returns a
single-pass range, then the example above fails to work.


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