Introduction
In the previous chapter, we learned about the basics of object-oriented programming using Ruby. We learned that classes serve as templates for objects. We also learned that classes can also serve as templates for other classes by using the mechanism of inheritance. However, there may be situations where we might have to share code among different classes that don't really fit into an inheritance architecture. For example, we could be designing a reality simulator. In the previous chapter, we talked about how cars have four wheels, bicycles have two wheels, and boats have no wheels, but they still fall under the "Vehicles" class. Imagine that we had previously been tasked with modeling houses or places to live, which we can easily do using classes. Now we are tasked with modeling a mobile home or RV, which serves as both a vehicle and a home.
In other object-oriented languages, this problem is solved with a concept known as "multiple inheritance"...
