Hi there, I'm quite a newbie with ties and multiple inheritance in perl (shame on me ... ;-)). What I wan't to do is to have a global hash which could be accessed like a singleton (via ...->instance()) - so I may get an instance of my hash anywhere in subsequent modules without passing the hash via parameters ...

My idea is to construct a "tied Singleton" by both inheriting from tie::refhash::nestable and Class::StrongSingleton.

What I did yet in my module file: 

package GlobalHash;

use vars qw(@EXPORT @EXPORT_OK $VERSION $REVISION $AUTOLOAD @ISA);
use Exporter;
...

use Tie::RefHash;
use Class::StrongSingleton;
use base qw(Class::StrongSingleton Tie::RefHash::Nestable );

sub TIEHASH {
  my $proto = shift;
  my $class = ref($proto) || $proto;
  my $self  = {@_};
  $self = Tie::RefHash::Nestable->TIEHASH($self, $class);
  # initialize it as a singleton
  $self->_init_StrongSingleton();

  $self->{'START'}  = scalar localtime;

  return $self;
}

[download]
This doesn't work, since $self = Tie::RefHash::Nestable->TIEHASH($self, $class); returns a Tie::RefHash::Nestable-object - but what I want to get back is a GlobalHash object ...

Any help welcome

Hoppfrosch

In reply to Multiple Inheritance - Howto marry tie::refhash::nestable with class::singleton by hoppfrosch

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