devel/p5-Role-Tiny 2.002005nb1 NetBSD

Role::Tiny is a minimalist role composition tool.

ROLE COMPOSITION

Role composition can be thought of as much more clever and meaningful multiple inheritance. The basics of this implementation of roles is:

\* If a method is already defined on a class, that method will not be
  composed in from the role.
\* If a method that the role "requires" to be implemented is not
  implemented, role application will fail loudly.

Unlike Class::C3, where the last class inherited from "wins," role composition is the other way around, where the class wins. If multiple roles are applied in a single call (single with statement), then if any of their provided methods clash, an exception is raised unless the class provides a method since this conflict indicates a potential problem.