my @arr = ( 110..117) ;

# Generic array Iterator ---
# Calls back $cb passing it a 2-element array : the INDEX, and an alias to the contents at that index
sub iter{
  my ($cb,$aref)=@_;  # $cb is the callback sub ref passed in..
  my $idx=0;
  for(@$aref){
    $cb->($idx,$_);
    $idx++
   }
};

# Call the iterator
 iter(sub{print "ops : @_\n"},\@arr); 

# Prints:
#ops : 0 110
#ops : 1 111
#ops : 2 112
# ....etc ...