Re: [Boost-users] iterators must go

Subject: Re: [Boost-users] iterators must go
From: Sebastian Redl (sebastian.redl_at_[hidden])
Date: 2009-05-16 07:31:22

Scott McMurray wrote:
> On Fri, May 15, 2009 at 17:15, Daniel James <daniel_james_at_[hidden]> wrote:
>   
>> The relevant point is that bringToFront's first range can step over
>> the second range.
>>
>>     
>
> I'm very curious how that's supposed to work.  What if, for example,
> the second range is a superset of the first?  Or, since they can be
> two different types, what happens if I do the same thing as the above,
> but "retro" one or both of the ranges?  It just sounds brittle to me.
>
> Or, even simpler, how do I do this?
>
> size_t strnlen(char *p, size_t n) {
>     return find(p, p+n, '\0') - p;
> }
>
> That's the size of a range, but I don't know how to get that range.
>   
You don't. Null-terminated strings, in Alexei's model, are ranges that
have a fixed end point, which you can't modify. (There is no
representation in the range for it.)
You basically have to reinterpret the nts as an array with a known
end-point, so you can treat it as a random access range. Now, for an
rar, getting that range is easy.

Sebastian