18 lines
790 B
Plaintext
18 lines
790 B
Plaintext
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.
|