package # hide the package from PAUSE InstanceCountingClass; use strict; use warnings; our $VERSION = '0.03'; use base 'Class::MOP::Class'; InstanceCountingClass->meta->add_attribute('count' => ( reader => 'get_count', default => 0 )); InstanceCountingClass->meta->add_before_method_modifier('_construct_instance' => sub { my ($class) = @_; $class->{'count'}++; }); 1; __END__ =pod =head1 NAME InstanceCountingClass - An example metaclass which counts instances =head1 SYNOPSIS 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 =head1 DESCRIPTION This is a classic example of a metaclass which keeps a count of each instance which is created. =head1 AUTHORS Stevan Little Estevan@iinteractive.comE Yuval Kogman Enothingmuch@woobling.comE =head1 COPYRIGHT AND LICENSE Copyright 2006-2008 by Infinity Interactive, Inc. L This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut