12. Generic constraints

In C#, Generics constraints allow you to restrict the types that can be used with a generic type or method. Here are some common constraints: a. where T : class: T must be a reference type (class). b. where T : struct: T must be a value type (struct). c. where T : new(): T must have a parameterless constructor. d. where T : <base class>: T must inherit from a specified base class. e. where T : <interface>: T must implement a specified interface. f. where T : U: T must be or derive from type U.

public class Box<T>
{
    private T value;
 
    public Box(T value)
    {
        this.value = value;
    }
 
    public T GetValue()
    {
        return value;
    }
}