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perlclassruntimemoosemetaclass

How do I make a new Moose class and instantiate an object of that class at runtime?

After creating a metaclass using Moose::Meta::Class->create, how do I instantiate a real Moose class with that class as a metaclass? (I need to create the metaclass also because I also want to apply some roles to it.)

Solution

  • The metaclass is the class, of course. If you want an instance of that class, just do:

    my $instance = $meta->name->new

    You might also need to make sure that $meta doesn't get collected too soon. Generally, you do this:

    $meta->add_method( meta => sub { $meta } );

    That will keep the metaclass around, but you're going to leak the class if you aren't careful. If you only do this once, it won't matter; if you do it thousands of times, you could get yourself into trouble.

    Much better to use something higher-level like Moose::Meta::Class::create_anon_class or MooseX::Traits.