From: David Abrahams (dave_at_[hidden])
Date: 2006-05-09 10:01:25
Thorsten Ottosen <thorsten.ottosen_at_[hidden]> writes:
> David Abrahams wrote:
>> Thorsten Ottosen <thorsten.ottosen_at_[hidden]> writes:
>
>>>The new version will feature special functions for generating ranges for
>>>the string library. We could probably wrap char* iterators in
>>>boost::string_iterator<char>. Are you sure we need the end iterator to
>>>be a different type?
>>
>>
>> No, you don't, in fact. Comparisons just get a little more expensive
>> than they'd need to be otherwise.
>
> You mean more expensive because you have to see which irerator that is
> the valid one?
The checks are more complicated than that, but that's the general
idea.
> In that case it might be reasoable to always mandate the left argument
> to be the valid iterator:
No, that violates EqualityComparable, not to mention every reasonable
person's expectations.
-- Dave Abrahams Boost Consulting www.boost-consulting.com