Bridge (aka Handle | Body)

Intent

• Decouple an abstraction from its implementation so that the two can vary independently.

Problem

• An abstraction and its implementation should be defined and extended independently from each other.

• A compile-time binding between an abstraction and its implementation should be avoided so that an implementation can be selected at run-time.

Solution

• Separate an abstraction from its implementation by putting them in separate class hierarchies.

• Implement the Abstraction in terms of an Implementor object.

Advantages

✅ Provides a flexible alternative to subclassing.

Disadvantages

❌ Introduces an additional level of indirection.