You have it backwards. If you want to use closures cleanly and effectively, it's the inner layer of the methods that need to be a closure. 
package UsesClosures;

sub new {
   my $attr;

   return bless({
      get_attr => sub {
         $attr
      },

      set_attr => sub {
         $attr = $_[1]
      },

      some_method => sub {
         print "$attr\n";
      }
   }, shift);
}

sub get_attr    { &{ shift->{get_attr   } } };
sub set_attr    { &{ shift->{set_attr   } } };
sub some_method { &{ shift->{some_method} } };

[download]
my $o = UsesClosures->new();
$o->set_attr(123);
print $o->get_attr();
$o->some_method();

[download]

Your Dinner module would be: 

package Dinner;

sub new {
   my $hands_clean = 1;

   return bless({
      wash_hands => sub {
         $hands_clean = 1;
      },

      eat_food => sub {
         die "Filthy\n if !$hands_clean;
         print "Om nom nom\n";
      },
   }, shift);
}

sub wash_hands { &{ shift->{wash_hands} } };
sub eat_food   { &{ shift->{eat_food  } } };

[download]
my $dirtyeater = Dinner->new();
$dirtyeater->wash_hands();
$dirtyeater->eat_food();

[download]

Like inside-out objects, such objects are hard to debug.

In reply to Re: Using closures to achieve data hiding in OO Perl by ikegami
in thread Using closures to achieve data hiding in OO Perl by saurabh.hirani

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