Let's say I have several POJOs which all extend a common supertype, BaseObject. I have a GenericDao which is declared as public interface GenericDao<T>. For each type-specific DAO, I have an interface which extends the generic type and restricts it to a concrete type (public interface UserDao extends GenericDao<User>) and then an impl...
I am writing some simple Vector and Matrix classes. They look like this: // Vector with Floats case class Vector3f(x: Float, y: Float, z: Float) { def +(v: Vector3f) = Vector3f(x + v.x, y + v.y, z + v.z) } // Vector with Doubles case class Vector3d(x: Double, y: Double, z: Double) { def +(v: Vector3d) = Vector3d(x + v.x, y + v.y, ...
Hi, In Scala variance can be defined with variance operators like + and - on the generic type argument. For example the List type is covariant in the standard library. class List[+A] So a function with a covariant list can be defined like this: def foo[A](list : List[A]) Also variance can be emulated with generic bounds. So we can...
I am supposed to create a custom ComboBox by deriving a class from ComboBox in my WinForms application. I have never done this before and not able to find many good example from Google. I am required to derive a custom combobox so that I can make the custom combobox type-bound to a particular object. Could you please point me into ...