composition

Consider these two traits: trait Poked extends Actor { override def receive = { case Poke(port, x) => ReceivePoke(port, x) } def ReceivePoke(port: String, x: Any) } trait Peeked extends Actor { override def receive = { case Peek(port) => ReceivePeek(port) } def ReceivePeek(port: String) } Now consider I can create a new Actor that implements both traits: val peekedpoked = actorRef(new Actor extends Poked with Peeked) How do I compose the receive handlers? i.e., the receiver should be something like the following code, though "automatically generated" (i.e., all traits should compose): def

Context / Question I've worked on numerous .NET projects that have been required to persist data and have usually ended up using a Repository pattern. Does anyone know of a good strategy for removing as much boilerplate code without sacrificing code base scalability? Inheritance Strategy Because so much of the Repository code is boiler plate and needs to be repeated I normally create a base class to cover the basics like exception handling, logging and transaction support as well as a few basic CRUD methods: public abstract class BaseRepository<T> where T : IEntity { protected void

I need a detailed explanation on the following: What do we use a UIViewController for? What is the use of it? I have a class that looks like the following: class one { UINavigationController *nav = ...; two *secondObject = ...; // By use of it, I have push the new view class two//ok } class two { ... } How can I use secondObject in the class one ? What is the class hierarchical start from the window? Erik The UIViewController is the controller part in the MVC design pattern. Model <-------> Controller <-------> View The controller's task is to handle navigation between different views, key

I would like to use composition and to write good forwarding methods for every possible overload (noexcept, const, volatile) using C++ capabilities. The idea is to use traits in order to determine whether a method is declared {noexcept / const / volatile / etc.} and to behave accordingly. Here is an example of what I would like to achieve : struct User{ UsedObject& obj; User(UsedObject& obj) : obj(obj) {} FORWARD_METHOD(obj, get); //here is where the forwarding happens }; struct UsedObject{ string m{"Hello\n"}; string& get(double d){ cout << "\tUsed :const not called...\n"; return m; } const

I've recently spent a good deal of time performing detailed UML designs of various SW components that I have since written. Looking back on what I have recently finished and comparing that to when I first learned UML, I see that I now almost strictly use Aggregation and Composition relationships, and have virtually abandoned "vanilla" non-directed/directed relationships. I still of course use Generalizations and Realizations, but these are distinctly different than those above and are not considered part of this question. It seems to me that Aggregation/Composition implies the same meaning of