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delphiinterfacedry

Two different objects implement the same Interface in the same way - how to stay DRY

I have the interface:

IColored that guarantees the function getColor.

Now I have two objects:
1. Ferrari
2. RedApple

that both implement this interface/function in the same way.
(But cannot inherit from the same object - no multi-inheritance allowed).

How would you avoid code-duplication?

Solution

  • I guess what you are looking for is object aggregation.

    Check out TAggregatedObject. The idea is to have an object that implements the behavior and as a property it delegates the interface functions to that inner object.