Re: [boost] Re: matrix and vector iterators

From: David Abrahams (abrahams_at_[hidden])
Date: 2001-06-12 14:50:09

----- Original Message -----
From: "Larry Evans" <jcampbell3_at_[hidden]>

> David Abrahams wrote:
>
> > One problem with this is that it requires much more of the iterator in
some
> > cases than it otherwise might. In an array stored as vectors of vectors
> > of... vectors, each iterator would need to have references to all of the
> > containing vectors.
>
> Couldn't the iterator just contain a vector of indices of length == rank,
> and a pointer to the vector of vectors of... vectors (VofV), and then just
index into
> the VofV with the vector of indices.

When you start talking about iterators containing vectors, I get worried.

> I guess bad thing about that is that it takes longer.

That's putting it mildly. Iterators should be lightweight.

-Dave