Programming Ruby 3.3

Delegator and SimpleDelegator

Object delegation is a way of composing objects—extending an object with the capabilities of another—at runtime. The Ruby Delegator class implements a simple but powerful delegation scheme, where requests are automatically forwarded from a master class to delegates or their ancestors and where the delegate can be changed at runtime with a single method call. The class SimpleDelegator is an implementation of Delegator that’s good enough for most purposes.

The typical use of SimpleDelegator is as a decorator. You create a class as a subclass of SimpleDelegator. You create new instances of the simple delegator class by passing it an existing instance of another class. When you call a method on the delegator, it’ll ...