Re: [Boost-users] Boost.Iterator questions

Subject: Re: [Boost-users] Boost.Iterator questions
From: John M. Dlugosz (mpbecey7gu_at_[hidden])
Date: 2011-07-24 02:34:33

On 7/23/2011 11:29 PM, Nathan Ridge wrote:
>

> Interesting problem!
>
> Would it work to make it bidirectional, and then define your own relational
> operators?
>

I would have no trouble defining the relational operators to just call the underlying 
iterator's.  It's just that various algorithms might not realize that it's possible, if 
it's tagged with a type that implies that iterators can't be compared at all, other than 
for equality.

Another thing I just realized:  I was supposing that being read-only, I'll just make a 
const_iterator but no non-const iterator.  But inserting into a container takes an 
iterator as the insertion position (not a const iterator).

So even with the advanced iterator concepts, the categories still don't match exactly, it 
would seem.