I have a diamond multiple inheritance scenario like this: A / \ B C \ / D The common parent, A, defines a virtual function fn(). Is it possible for both B and C to define fn()? If it is, then the next question is - can D access both B and C's fn() without disambiguation? I'm assuming there is some syntax for this....
Java is not allowing inheritance from multiple classes (still it allows inheritance from multiple interfaces.), I know it is very much inline with classic diamond problem. But my questions is why java is not allowing multiple inheritance like C++ when there is no ambiguity (and hence no chances of diamond problem) while inheriting from m...
This is a simplification of some real code, and a real mistake I made when I didn't realize someone else had already implemented Foo and derived from it. #include <iostream> struct Base { virtual ~Base() { } virtual void print() = 0; }; struct OtherBase { virtual ~OtherBase() { } }; struct Foo : public Base { // better to us...
Just for fun I am working on a XUL implementation for Windows. In XUL, UI elements can be written in XML like this: <window width="800" height="600"></window> I am considering a system for getting and setting element attributes. It's working pretty well but I am not certain if the use of diamond inheritance is potentially hazardous he...
Wikipedia on the diamond problem: "... the diamond problem is an ambiguity that arises when two classes B and C inherit from A, and class D inherits from both B and C. If a method in D calls a method defined in A (and does not override the method), and B and C have overridden that method differently, then from which class does it inheri...
Here's an example using multiple interface inheritance in Java and there's an issue. Note that I fully know why there's an issue and this is not the point of my question. The question is about how you name this particular multiple interface inheritance ambiguity, if there's a name for it. For example, in C++, the ambiguity that arises...
Is there a way to define a class Foo in C++ so that I can inherit from it I can't "diamond inherit" from it I.e. class Cat: public Foo{} // okay class Dog: public Foo{} // okay class Weird: public Cat, public Dog {} // I want this to throw a compiler error ...
#include <iostream> using namespace std; class A { public: void eat(){ cout<<"A";} }; class B: public A { public: void eat(){ cout<<"B";} }; class C: public A { public: void eat(){ cout<<"C";} }; class D: public B,C { public: void eat(){ cout<<"D";} }; int main(){ A *a = new D(); a->eat(); } I am not sure this...
class A { public: void eat(){ cout<<"A";} }; class B: virtual public A { public: void eat(){ cout<<"B";} }; class C: virtual public A { public: void eat(){ cout<<"C";} }; class D: public B,C { public: void eat(){ cout<<"D";} }; int main(){ A *a = new D(); a->eat(); } I understand the dia...
Hello there, I have something like that (simplified) class A { public: virtual void Function () = 0; }; class B { public: virtual void Function () = 0; }; class Impl : public A , public B { public: ???? }; How can I implement the Function () for A and the Function() for B ? Visual C++ lets you only define the s...
Strange problem occurred when I tried to "solve" usual diamond problem in a usual way - using virtual inheritance: A / \* both virtual B C \ / D However my base class A doesn't have default constructor, so I was to call it manually from D. However when I try to add a class E into this diamond as C-inherited A / \* both vir...
Hi all! I'm currently working on integrating a third-party package that uses lots of RTTI stuff on a non-RTTI platform (Android). Basically, I did my own RTTI implementation but I'm stuck on a problem. The issue is that a lot of classes are having the diamond inheritance problem since all the classes derive from the same base class (ob...
I have this A / \ B C \ / D A has a pure virtual function, prototyped as: virtual A* clone(void) const = 0; B and C virtually inherit from A ( class B: public virtual A, class C: public virtual A) B has the virtual function, prototyped as: virtual B* clone(void) const {}; C has the virtual function, protot...