If you want the list generated at once, you could use the following snippet by merlyn. If you want an iterative solution, you could use the following. A benefit being that it should work in relatively constant time no matter how big the arrays are.
`my @aoa = (
[1,2],
['a','b','c','d'],
['A','B','C'],
);
my $iter = make_aoa_iterative(@aoa);
while (my @els = $iter->() ){
print @els,"\n";
}
sub make_aoa_iterative {
my @arefs = @_;
my @arrayindexes = ();
foreach (@arefs){
push @arrayindexes,[$_,0,$#{$_}];
}
return sub {
return if $arrayindexes[0]->[1] > $arrayindexes[0]->[2];
my @els = map { $_->[0]->[ $_->[1]] } @arrayindexes;
# Check for out of bounds....
$arrayindexes[$#arrayindexes]->[1]++;
for (my $i = $#arrayindexes; $i > 0; $i--){
if ($arrayindexes[$i]->[1] > $arrayindexes[$i]->[2
+]){
$arrayindexes[$i]->[1] = 0;
$arrayindexes[$i-1]->[1]++;
}else{
last;
}
}
return @els;
};
}
`
**Update**
I'm formal-math challenged. Is this formally a permutation? If someone could clarify, I'd appreciate it.
-Lee
"To be civilized is to deny one's nature." |
Comment onIterator for multidimensional arrays