Re: [boost] Proposed addition to the iterator library for iterating over all tuples.

From: David Abrahams (dave_at_[hidden])
Date: 2005-07-25 08:06:32

Alex Mendes da Costa <alexmdac_at_[hidden]> writes:

> Hi folks:
>
> I quite often have to write code to do the following:
>
> Given N sequences, generate all the N-tuples s.t. the i'th element in
> each tuple is drawn from the i'th sequence.
>
> For example, if sequence S1 is { 1, 2, 3 } and sequence S2 is { 10, 20
> }, I need to generate these tuples: (1, 10), (2, 10), (1, 20), (2,
> 20).
>
> I think this problem could be solved elegantly with a iterator similar
> to zip_iterator.  I have some questions:

Why not use zip_iterator?

> (1) Is there already a way to do this in boost?

http://www.boost.org/libs/iterator/doc/zip_iterator.html
??

> (2) If not, would this be a worthwhile addition to the iterator
> library?

Don't we already have it?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com