That's the same thing as:
$iter_prod = NestedLoops([
sub { iter(qw(a b c) },
sub { iter(qw(x y z) },
]);
Wasn't the whole point to avoid flattening the iterator and to provide arbitrary nesting? Your solution flattens, and the depth is hardcoded as a sequence of calls to iter_prod.
Note: NestedLoops's iterator returns an array rather than an array ref.
Update: Your solution does support arbitrary depth:
my $iter = do { my $done = 0; sub { $done++ ? undef : 1 } };
iter_prod($iter, ...) if ...;
iter_prod($iter, ...) if ...;
With NestedLoops, you'd do:
my @iters;
push(@iters, ...) if ...;
push(@iters, ...) if ...;
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