I don't care about "cool". I care about "useful". Callbacks are fundamentally inflexible (Re: Are you looking at XML processing the right way? (merge)).
Note that turning my iterator into your callback interface is trivial:
sub forDerange(&@)
{
my $cv= shift @_;
my $iter= genDerange( @_ );
my @list;
while( @list= $iter->() ) {
$cv->( @list );
}
}
Try to go the other way. (:
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