InstanceCountingClass - An example metaclass which counts instances

  package Foo;

  use metaclass 'InstanceCountingClass';

  sub new  {
      my $class = shift;
      $class->meta->new_object(@_);
  }

  # ... meanwhile, somewhere in the code

  my $foo = Foo->new();
  print Foo->meta->get_count(); # prints 1

  my $foo2 = Foo->new();
  print Foo->meta->get_count(); # prints 2  

  # ... etc etc etc

This is a classic example of a metaclass which keeps a count of each instance which is created.

Stevan Little <stevan@iinteractive.com>

Yuval Kogman <nothingmuch@woobling.com>

Copyright 2006-2008 by Infinity Interactive, Inc.

http://www.iinteractive.com

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.