As I understand. You don’t call any Derived properties (myVar belongs to Base, not to Derived). And java is not running static block from Derived. If you add some static field to Derived and access it, then java executes all static blocks. class Base { static public int myVar; } class Derived extends Base { … Read more
Rails supports Single Table Inheritance. From the AR docs: Active Record allows inheritance by storing the name of the class in a column that by default is named “type” (can be changed by overwriting Base.inheritance_column). This means that an inheritance looking like this: class Company < ActiveRecord::Base; end class Firm < Company; end class Client … Read more
Finally figured out a solution/workaround to this issue. If you remove the property wrapper from the subclass, and call the baseclass objectWillChange.send() on the variable the state is updated properly. NOTE: Do not redeclare let objectWillChange = PassthroughSubject<Void, Never>() on the subclass as that will again cause the state not to update properly. I hope … Read more
Constructors are not inherited, you must create a new, identically prototyped constructor in the subclass that maps to its matching constructor in the superclass. Here is an example of how this works: class Foo { Foo(String str) { } } class Bar extends Foo { Bar(String str) { // Here I am explicitly calling the … Read more
No, you cannot access derived_int because derived_int is part of Derived, while basepointer is a pointer to Base. You can do it the other way round though: Derived* derivedpointer = new Derived; derivedpointer->base_int; // You can access this just fine Derived classes inherit the members of the base class, not the other way around. However, … Read more
C# doesn’t have support for automatically enforcing this, but you can enforce it by using the template method pattern. For example, imagine you had this code: abstract class Animal { public virtual void Speak() { Console.WriteLine(“I’m an animal.”); } } class Dog : Animal { public override void Speak() { base.Speak(); Console.WriteLine(“I’m a dog.”); } … Read more
A derived class has access to the public, protected, internal, and protected internal members of a base class. Even though a derived class inherits the private members of a base class, it cannot access those members. However, all those private members are still present in the derived class and can do the same work they … Read more
Liskov Substitution Principle Generally you don’t want you method signature to vary in derived types. This can cause problems if you want to swap the use of derived types. This is often referred to as the Liskov Substitution Principle. Benefits of Explicit Signatures At the same time I don’t think it’s correct for all your … Read more
The correct way to think about this is to imagine that every class requires its objects to have a certain number of “slots”; those slots are filled with methods. The question “what method actually gets called?” requires you to figure out two things: What are the contents of each slot? Which slot is called? Let’s … Read more
You’ll want to use: Backbone.Model.prototype.clone.call(this); This will call the original clone() method from Backbone.Model with the context of this(The current model). From Backbone docs: Brief aside on super: JavaScript does not provide a simple way to call super — the function of the same name defined higher on the prototype chain. If you override a … Read more