Re: [Boost-users] [STL] An question about list::iterator

From: dhruva (dhruvakm_at_[hidden])
Date: 2007-11-05 00:23:53

Hi,
 Sorry for the typo in my previous posting which conveyed the opposite!

On 11/5/07, dhruva <dhruvakm_at_[hidden]> wrote:
> Hi,
>
> On 11/5/07, LoadCom <LoadCom_at_[hidden]> wrote:
> > Or, in other words, I want to test if an iterator
> > itself doesn't point to any object - that is different from
> > the begin() or end() of a list.
>
> From my little understanding of the rationale behind such a behavior,
> following is my take on it.
>
> 1. The iterator is a pattern to fetch the content/s of a container
> 2. Hence, it really points to a location. It could either be the first
> entry (begin), something till the last (including the last element) or
> beyond to signify the end of the container
>
> I do feel it would be right to have an iterator pointing to nowhere.

I do NOT feel it would be right to have an iterator pointing to nowhere.

> Maybe an uninitialized state would make sense but that would be like
> have a similar state for a boolean. The boolean can either be true or
> false, you do not have a third state to say that it was not
> initialized. Maybe, the boost::tribool is the outcome of such a
> requirement, I am just guessing though.
>

-dky

-- 
Dhruva Krishnamurthy
Contents reflect my personal views only!