That’s not what super() is for. Super basically picks one (or all) of its parents in a specific order. If you only want to call a single parent’s method, do this class ASDF(ASDF1, ASDF2, ASDF3): def __init__(self): ASDF2.__init__(self)
Name lookup must occur first. In this case for the name operator++. [basic.lookup] (emphasis mine) 1 The name lookup rules apply uniformly to all names (including typedef-names ([dcl.typedef]), namespace-names ([basic.namespace]), and class-names ([class.name])) wherever the grammar allows such names in the context discussed by a particular rule. Name lookup associates the use of a name … Read more
Sorry, you cannot inherit from multiple classes. You may use interfaces or a combination of one class and interface(s), where interface(s) should follow the class name in the signature. interface A { } interface B { } class Base { } class AnotherClass { } Possible ways to inherit: class SomeClass : A, B { … Read more
This problem doesn’t come up very often. The solution I’m familiar with was designed by Doug McIlroy and appears in Bjarne Stroustrup’s books (presented in both Design & Evolution of C++ section 12.8 and The C++ Programming Language section 25.6). According to the discussion in Design & Evolution, there was a proposal to handle this … Read more
A practical example: class A {}; class B : public A {}; class C : public A {}; class D : public B, public C {}; Notice how class D inherits from both B & C. But both B & C inherit from A. That will result in 2 copies of the class A being … Read more
Do not use super(baseclass, …) unless you know what you are doing. The first argument to super() tells it what class to skip when looking for the next method to use. E.g. super(A, …) will look at the MRO, find A, then start looking for __init__ on the next baseclass, not A itself. For C, … Read more
Sorry I saw this so late, but class MixedClass2(SomeMixin, MyClass): pass >>> m = MixedClass2() mixin before base mixin after The pattern @Ignacio is talking about is called cooperative multiple inheritance, and it’s great. But if a base class isn’t interested in cooperating, make it the second base, and your mixin the first. The mixin’s … Read more
A C object contains two sub-objects, of types A and B. Obviously, these must have different addresses since two separate objects can’t have the same address; so at most one of these can have the same address as the C object. That is why printing the pointers gives different values. Comparing the pointers doesn’t simply … Read more
By implementing the interface explicitly, like this: public interface ITest { void Test(); } public interface ITest2 { void Test(); } public class Dual : ITest, ITest2 { void ITest.Test() { Console.WriteLine(“ITest.Test”); } void ITest2.Test() { Console.WriteLine(“ITest2.Test”); } } When using explicit interface implementations, the functions are not public on the class. Therefore in order … Read more
Suppose you have 2 kinds of things in your domain : Trucks and Kitchens Trucks have a driveTo() method and Kitchens a cook() method. Now suppose Pauli decides to sell pizzas from the back of a delivery truck. He wants a thing where he can driveTo() and cook() with. In C++ he would use multiple … Read more