I'm trying to clean duplicate code. The only difference are calls like MyType x = Foo.LookupService<MyType>(); vs. MyType x = Bar.FindService<MyType>(); So we have two mehtods of type T xxx<T>(), i.e. a method returning an instance of T given the class parameter T. How could I pass such functions as a parameter to a method that tri...
I thought I understood this but obviously not... I have a method signature like so: void doSomething(List<TypeA> typeAs){...} List<TypeA<TypeB>> getTypeBTypeAs(){...} but if I try and call doSomething(getTypeBTypeAs()); I get a compile error: "the method doSomething(List) in the type ... is not applicable for the arguments (List>)"...
Possible Duplicates: C# -Generic Extension Method How do you write a C# Extension Method for a Generically Typed Class Is it possible to declare extension methods for generic classes? public class NeedsExtension<T> { public NeedsExtension<T> DoSomething(T obj) { } } ...
I may of worded the title completely wrong, but basically, I have the following base class: public class ScheduleableService<T> : ServiceBase where T : IJob { var x = typeof(T); } The implementation of this is something like: public class MyScheduledService: ScheduleableService<MyScheduledJob> { //MyScheduledJob i...
I had a class hierarchy setup like so: public abstract class GameController public abstract class Game I wanted to use a generic GameController class so it takes specific Game subclasses, so I changed it to: public abstract class GameController<GameType extends Game> public abstract class Game But then I also wanted to have a gener...
I want to do something like this class SomeClass<T> { SomeClass() { bool IsInterface = T is ISomeInterface; } } What is the best way to something like this? Note: I am not looking to constrain T with a where, but I would like my code to be aware of what types of interfaces T implements. I would prefer that I dont hav...
I have some generic code which I cannot figure out how to legitimately prevent getting warnings from; I am using @SuppressWarnings("unchecked") for the moment, since it seems that casting a generic type can't be done without warnings. How can I get rid of the annotation? What I have is: public MyObject(SharedContext<Object> ctx) { ...
Hello =) I'm new at the C# thing.... (.net 3.5) I want a Dictionary to hold two different types of object, one of the type is generic. while iterating through the list, i will call methods like add and clone. I have tried it with a base class and subclasses.... namespace ConsoleApplication1 { class Element{ } class Child1...
I want to make a growable array of bytes. I.e a list. In c# would usally do the following syntax List<byte> mylist = new List<byte>(); where as in java this syntax does not work and I have googled around and found the below code List myList = new ArrayList(); but that is not what I want. Any idea's where I am going wrong? ...
hello, I am trying to implement my own generic flatten for list objects which hold lists in scala. At this point I have def myFlatten[T](list: List[List[t]]): List[T] = { for (xs <- list) for (x <- xs) yield x } I am getting message for xs found Unit required list. ...
My 1st objective is to filter the types based on a specific interface with a generic. My 2nd objective is to obtain the type of the generic parameter itself. public UserService : IUserService, IDisposable, IExportableAs<IUserService> { ... } I cannot assume the structure of the class, its interfaces (if any at all) or alike. The...
e.g. public interface CacheClient { List<?> getKeysWithExpiryCheck(); } Or should I return List<Object> ...
This is probably a very basic question, but I'm really new to generics in Java and I'm having a hard time altering my thought process from the way things are done in C#, so bear with me. I'm trying to build a generic repository in Java. I've created an IRepository interface that looks like this: public interface IRepository<T extends I...
Basically, I'm using an ORM (specifically LLBLGen) that creates entity objects for all my tables. All these entity types inherit from a base class (or really a set of them). I want to create an extension method that accepts a List of the base class and returns some string but I want to pass in inherited types without explicitly casting. ...
In the following line Graph<Number,Number> ig = Graphs.<Number,Number>synchronizedDirectedGraph( new DirectedSparseMultigraph<Number,Number>()); could you please explain what Graphs.<Number,Number>synchronizedDirectedGraph means ? It looks like a call to a method Graphs.synchronizedDirectedGraph, but the ...
I'm using generics rather long time but I've never used construction like List<? super T>. What does it mean? How to use it? How does it look after erasure? I also wonder: is it something standard in generic programming (template programming?) or it's just a java 'invention'? Does c#, for example, allow similar constructions? ...
Hello, everyone! I thought, I would understand Java generics by now. But now I'm helpless again. I have a generic class where a c-tor constructs correctly-typed instance, while a static factory method produces a type mismatch. Please look at the following code: public class _GenericFactoryMethods { public final static class DemoCl...
I'm trying out Generics and I had this (not so) great idea of creating an XMLSerializer class. The code I pieced together is below: public class Persist<T> { private string _path; public Persist(string path) { this._path = path; } public void save(T objectToSave) { XmlSerializer s = new XmlSerializer(...
I created some methods that use nested type parameters generic types in the parameter declaration: public void Foo(IList<Pair<double, IList<double>>> myParameter) { // code goes here } What I wanted to achieve was to force this method to accept 4 types of variables: List<Pair<double, List<double>>> myVar List<Pair<double, double[]>...
How do I override the equals method in the object class? i.e I have class Person{ //need to override here public boolean equals (Object obj){ } I want to convert the parameter obj to a type Person, but if I do (Person) obj it won't work. ...