NAME

Joose.Manual.MetaRoles - Yet another special kind of Roles in Joose.

WHAT IS A META-ROLE?

Meta-role is a usual role, applied to a meta-class instance. Because of that, meta-role is also a trait.

Like any other Role, meta-role modifies the class, adding some re-usable behavior to it. Most probably this behaviour will be related to the constructing of the class being modified, for example it will provide additional builders for class.

APPLYING META-ROLE

Meta roles can be added to class using the metaRole or trait builders:

    Class('Person', {

        trait : JooseX.Storable,

        has : {
            firstName : {},
            lastName  : {}
        }
    })

Here we declared a class Person, which metaclass instance (Person.meta) will have trait JooseX.Storable applied.

This trait probably provides the facilities to serialize the current state of the class and later restore it.

See this Cookbook recipe on how to create custom meta-role.

REMOVING META-ROLE

For symmetry, its possible to remove the meta-role, using removeMetaRole builder:

    Person.meta.extend({
        removeMetaRole : JooseX.Storable
    })

AUTHOR

Nickolay Platonov nickolay8@gmail.com

Heavily based on the original content of Moose::Manual, by Dave Rolsky autarch@urth.org

COPYRIGHT AND LICENSE

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