multiple-inheritance

Suppose I have this variadic base class-template: template <typename ... Types> class Base { public: // The member foo() can only be called when its template // parameter is contained within the Types ... pack. template <typename T> typename std::enable_if<Contains<T, Types ...>::value>::type foo() { std::cout << "Base::foo()\n"; } }; The foo() member can only be called when its template-parameter matches at least one of the parameters of Base (the implementation of Contains is listed at the bottom at this post): Base<int, char>().foo<int>(); // fine Base<int, char>().foo<void>(); // error Now

Consider following hierarchy: struct A { int a; A() { f(0); } A(int i) { f(i); } virtual void f(int i) { cout << i; } }; struct B1 : virtual A { int b1; B1(int i) : A(i) { f(i); } virtual void f(int i) { cout << i+10; } }; struct B2 : virtual A { int b2; B2(int i) : A(i) { f(i); } virtual void f(int i) { cout << i+20; } }; struct C : B1, virtual B2 { int c; C() : B1(6),B2(3),A(1){} virtual void f(int i) { cout << i+30; } }; What's the exact memory layout of C instance? How many vptrs it contains, where exactly each of them is placed? Which of virtual tables are shared with virtual table of C?

I'm running Python 2.5, so this question may not apply to Python 3. When you make a diamond class hierarchy using multiple inheritance and create an object of the derived-most class, Python does the Right Thing (TM). It calls the constructor for the derived-most class, then its parent classes as listed from left to right, then the grandparent. I'm familiar with Python's MRO ; that's not my question. I'm curious how the object returned from super actually manages to communicate to calls of super in the parent classes the correct order. Consider this example code: #!/usr/bin/python class A

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 multiple base class ? 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. I have read that most programmers don't use multiple inheritance in a

I have code like this: class A(object): def __init__(self): self.a = 1 class B(A): def __init__(self): self.b = 2 super(self.__class__, self).__init__() class C(B): def __init__(self): self.c = 3 super(self.__class__, self).__init__() Instantiating B works as expected but instantiating C recursed infinitely and causes a stack overflow. How can I solve this? When instantiating C calls B.__init__ , self.__class__ will still be C, so the super() call brings it back to B. When calling super(), use the class names directly. So in B, call super(B, self) , rather than super(self.__class__, self) (and

A colleague and I are having a bit of an argument over multiple inheritance. I'm saying it's not supported and he's saying it is. So, I thought that I'd ask the brainy bunch on the net. Nope, use interfaces instead! ^.^ Asad Butt Sorry, you cannot inherit from multiple classes . You may use interfaces or a combination of one class and interface(s) , where interface(s) should be followed by class name in the signature. interface A { } interface B { } class Base { } class AnotherClass { } Possible ways to inherit: class SomeClass : A, B { } // from multiple Interface(s) class SomeClass : Base, B