perl-MooseX-Singleton
Turn your Moose class into a singleton
A singleton is a class that has only one instance in an application. 'MooseX::Singleton' lets you easily upgrade (or downgrade, as it were) your Moose class to a singleton. All you should need to do to transform your class is to change 'use Moose' to 'use MooseX::Singleton'. This module uses metaclass roles to do its magic, so it should cooperate with most other 'MooseX' modules.
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