role Metamodel::RoleContainer
Error ReportCollection examples

Metaobject that supports holding/containing roles

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);


method add_role

method add_role($objMu $role)

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

method roles_to_compose

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

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