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role Metamodel::RoleContainer {}

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Warning: this role is part of the Rakudo implementation, and is not a part of the language specification.

Implements the ability to hold roles to be held for composition.

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class A does SomeRole {}

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roughly corresponds to

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class A {
    BEGIN A.^add_role(SomeRole);
}

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Methods §

method add_role §

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method add_role($obj, Mu $role)

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Adds the $role to the list of roles to be composed.

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method roles_to_compose($obj --> List:D)

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returns a list of roles added with add_role, which are to be composed at type composition time.