May 26, 2018

Roles, like a nouvelle cusine portion size slice of Moose

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 ClassC3, where the last class inherited from “wins,” role composition is the other way around, where first wins. In a more complete system see Moose roles are checked to see if they clash. The goal of this is to be much simpler, hence disallowing composition of multiple roles at once.

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