/usr/share/doc/libmoose-perl/examples/InstanceCountingClass.pod is in libmoose-perl 2.0401-1.
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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 E<lt>stevan@iinteractive.comE<gt>
Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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