Overloading generally means that you have two or more functions in the same scope having the same name. The function that better matches the arguments when a call is made wins and is called. Important to note, as opposed to calling a virtual function, is that the function that’s called is selected at compile time. … Read more
Overrides is the more normal qualifier. If the child class redefines a base class function in this way, then regardless of how a child object is referenced (using either a base class or a child class reference) it is the child function that is called. On the other hand, if the child class function Shadows … Read more
You need to use virtual keyword abstract class Base { // use virtual keyword public virtual int x { get { throw new NotImplementedException(); } } } or define an abstract property: abstract class Base { // use abstract keyword public abstract int x { get; } } and use override keyword when in the … Read more
This is indeed correct behaviour as overload resolution takes place at compile time (it would be a pretty expensive operation to take place at runtime). Therefore from within test(value:), the only thing the compiler knows about value is that it’s of some type that conforms to DispatchType – thus the only overload it can dispatch … Read more
There is no polymorphism for fields in Java. There is however, inheritance. What you’ve effectively done is create two fields in your Rectangle class, with the same name. The names of the field are, effectively: public class Rectangle { public int Shape.x; public int Rectangle.x; } The above doesn’t represent valid Java, its just an … Read more
This answer is not talking about C#, but it helped me understand the issues better and maybe it will help others: Why is there no parameter contra-variance for overriding?
@Override is not a keyword, it is an optional annotation that helps the compiler check that you indeed are overriding a method. If you say @Override but there is no method to override, the compiler will tell you that you’ve probably made a typo. Rename method1 to method12 to see the effect. Interface cannot have … Read more
Inheriting/overriding private methods In PHP, methods (including private ones) in the subclasses are either: Copied; the scope of the original function is maintained. Replaced (“overridden”, if you want). You can see this with this code: <?php class A { //calling B::h, because static:: resolves to B:: function callH() { static::h(); } private function h() { … Read more
You need to provide custom __getitem__(), __setitem__ and __delitem__ hooks. These are passed a slice object when slicing the list; these have start, stop and step attributes. However, these values could be None, to indicate defaults. Take into account that the defaults actually change when you use a negative stride! However, they also have a … Read more
If you don’t want to iterate over all your anchor elements, you can simply use event delegation, for example: document.onclick = function (e) { e = e || window.event; var element = e.target || e.srcElement; if (element.tagName == ‘A’) { someFunction(element.href); return false; // prevent default action and stop event propagation } }; Check the … Read more