4b90070f45
devel/p5-Role-Tiny as requirement for upcoming update for devel/p5-Moo.
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.
17 lines
790 B
Text
17 lines
790 B
Text
Role::Tiny is a minimalist role composition tool.
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ROLE COMPOSITION
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Role composition can be thought of as much more clever and meaningful
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multiple inheritance. The basics of this implementation of roles is:
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* 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
|
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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.
|