Thanks! :)

The code in Algorithm::Odometer::Tiny is indeed tiny, but loops over lists/arrays not subs. (like the other listed solutions)

(my title Cross Product might be misleading though ... sorry)

EDIT: I suppose though it is possible to re-init the arrays once one loop level is entered.

I wasn't able to locate the code for "forsetproduct from Math::Prime::Util" but the docs say

Our "forsetproduct" matches Set::Product in both high performance and functionality (that module's single function "product" in Set::Product is essentially identical to ours).

But that's not a lazy iterator but returning a greedy list.

Regarding Set::Product::XS , I'm more interested in PP solutions.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

update

On a side note, if you want to create a string from the product, consider using the glob-iterator

  DB<65> p "$_\n" while <"{1,2,3}:{a,b,c}">
1:a
1:b
1:c
2:a
2:b
2:c
3:a
3:b
3:c

[download]

In reply to Re^2: Efficient but elegant Cross-Product iterator ? by LanX
in thread Efficient but elegant Cross-Product iterator ? by LanX

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