Multiple Inheritance in java
It was a design decision of Java. You’ll never get it, so don’t worry too much about it. Although MI might help you make Mixins, that’s the only good MI will ever do you.
diamond-problem
Diamond Inheritance Lowest Base Class Constructor
The most derived class initializes any virtual base classes. In your class hierarchy, Unknown must construct the virtual Animal base class (e.g. by adding Animal(a) to its initialization list). When constructing an Unknown object, neither Fish nor Bird will call the Animal constructor. Unknown will call the constructor for the Animal virtual base.
C++ virtual override functions with same name
You cannot use qualified names there. I you write void Function() { … } you are overriding both functions. Herb Sutter shows how it can be solved. Another option is to rename those functions, because apparently they do something different (otherwise i don’t see the problem of overriding both with identical behavior).
Diamond Problem
Its not the same problem. In the original problem, the overriden method can be called from A. In your problem this can’t be the case because it does not exist. In the diamond problem, the clash happens if class A calls the method Foo. Normally this is no problem. But in class D you can … Read more
Diamond inheritance (C++)
Inheritance is the second strongest (more coupling) relations in C++, preceded only by friendship. If you can redesign into using only composition your code will be more loosely coupled. If you cannot, then you should consider whether all your classes should really inherit from the base. Is it due to implementation or just an interface? … Read more
python multiple inheritance passing arguments to constructors using super
Well, when dealing with multiple inheritance in general, your base classes (unfortunately) should be designed for multiple inheritance. Classes B and C in your example aren’t, and thus you couldn’t find a proper way to apply super in D. One of the common ways of designing your base classes for multiple inheritance, is for the … Read more
What are the differences between abstract classes and interfaces in Java 8?
Interfaces cannot have state associated with them. Abstract classes can have state associated with them. Furthermore, default methods in interfaces need not be implemented. So in this way, it will not break already existing code, as while the interface does receive an update, the implementing class does not need to implement it. As a result … Read more
How does virtual inheritance solve the “diamond” (multiple inheritance) ambiguity?
You want: (Achievable with virtual inheritance) A / \ B C \ / D And not: (What happens without virtual inheritance) A A | | B C \ / D Virtual inheritance means that there will be only 1 instance of the base A class not 2. Your type D would have 2 vtable pointers … Read more
Java Multiple Inheritance
You could create interfaces for animal classes (class in the biological meaning), such as public interface Equidae for horses and public interface Avialae for birds (I’m no biologist, so the terms may be wrong). Then you can still create a public class Bird implements Avialae { } and public class Horse implements Equidae {} and … Read more