multiple-inheritance

I know the diamond problem and method to solve it using virtual base class. I tried to solve diamond problem in a different way but did not succeed. I don't know why. #include <iostream> using namespace std; class A { public: void display() { cout << "successfully printed"; } }; class B: public A { }; class C: private A // display() of A will become private member of C { }; class D: public B, public C // private member display() of C should not be inherited { }; int main() { D d; d.display(); return 0; } As the private members are not inherited the class D will not inherit any function from C,

Consider classic virtual inheritance diamond hierarchy. I wonder to know what is the right implementation of copy and swap idiom in such hierarchy. The example is a little artificial - and it is not very smart - as it would play good with default copy semantic for A,B,D classes. But just to illustrate the problem - please forget about the example weaknesses and provide the solution. So I have class D derived from 2 base classes (B<1>,B<2>) - each of B classes inherits virtually from A class. Each class has non trivial copy semantics with using of copy and swap idiom. The most derived D class

To follow from my previous question about virtual and multiple inheritance (in a cross platform scenario) - after reading some answers, it has occurred to me that I could simplify my model by keeping the server and client classes, and replacing the platform specific classes with #ifdefs (which is what I was going to do originally). Will using this code be simpler? It'd mean there'd be less files at least! The downside is that it creates a somewhat "ugly" and slightly harder to read Foobar class since there's #ifdefs all over the place. Note that our Unix Foobar source code will never be passed

I have to create a Course Management System with course categories: Cooking, sewing and writing courses cooking and writing each have 2 courses (Italian, seafood, creative write and business write). This creates derived abstract: abstract course -> abstract cooking -> concrete seafood The abstract cooking and writing have common fields and some common methods, however they also have abstract methods that are abstract in the base class. Can this be done in C#? If I make the derived abstract class methods abstract Visual Studio says they hide the base class abstract and then the concrete class

If I run this code, I'v got the subject error message. But why? And how to avoid it getting the C class having its parents slots? class A(): __slots__ = ['slot1'] class B(): __slots__ = ['slot2'] class C(A, B): __slots__ = [] MT-FreeHongKong Simply speak, you just cannot do it. As stated in Documentation , Multiple inheritance with multiple slotted parent classes can be used, but only one parent is allowed to have attributes created by slots (the other bases must have empty slot layouts) - violations raise TypeError. The idea behind __slots__ is to reserve specific slots for each attribute in

Extending both an abstract base class and a class derived from "object" works as you would expect: if you you haven't implemented all abstract methods and properties, you get an error. Strangely, replacing the object-derived class with an class that extends "Exception" allows you to create instances of classes which do not implement all the required abstract methods and properties. For example: import abc # The superclasses class myABC( object ): __metaclass__ = abc.ABCMeta @abc.abstractproperty def foo(self): pass class myCustomException( Exception ): pass class myObjectDerivedClass( object )