role Metamodel::RoleContainer {}

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.

class A does SomeRole {}

roughly corresponds to

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

Methods

method add_role

method add_role(Metamodel::RoleContainer:D: $obj, Mu $role)

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

method roles_to_compose

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

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

Type Graph