Constraining the Type Parameters
Learn how to restrict generic type parameters to specific base classes, value types, or constructors to ensure type safety and functionality.
A generic can accept any type parameter we provide. Sometimes, however, we must restrict which types are allowed to ensure our code functions correctly.
Consider a set of classes that includes an abstract Vehicle base class, Car and Truck subclasses, and a Garage class. Since we have two distinct vehicle types, it initially appears that we need two specific garage types.
Instead of creating separate classes, we create one generic Garage class: