In the line below:
public class Tree<TItem> where TItem : IComparable<TItem>
This line I'm creating the definition of type TItem where TItem implements the IComparable interface, ie I'm creating a generic type definition that implements what was defined in the interface IComparable as method e / or properties.
My question would be in the line below, where type T implements a class . Why does a class and not a specific class? What is the purpose of creating a definition for type T that implements a class ?
public class Repository<T> : IDisposable where T : class