I found this while searching for how to fake multiple inheritance in PHP (since PHP does not support multiple inheritance directly). http://stackoverflow.com/questions/356128/can-i-extend-a-class-using-more-than-1-class-in-php/356431#356431 Here is the complete code given there:- class B { public function method_from_b($s) { ...
I've got a base class where I want to handle __add__() and want to support when __add__ing two subclass instances - that is have the methods of both subclasses in the resulting instance. import copy class Base(dict): def __init__(self, **data): self.update(data) def __add__(self, other): result = copy.deepcopy(...
I have three classes: class A {}; class B : virtual public A {}; class C : virtual public A {}; class D: public B, public C {}; Attempting a static cast from A* to B* I get the below error: cannot convert from base A to derived type B via virtual base A ...
My multiple-inheritance-fu is not strong. I am trying to create a superclass whose __init__ takes an optional named parameter and subclasses of it which also inherit from built-in types. Sadly, I appear to have no idea how to make this work: >>> class Super(object): name = None def __init__(self, *args, name=None, **kwargs): ...
hello, I want to send data and a capability description to a remote site. Upon receiving the data at the remote site, I want to look at the description and create an object (via a factory method ) doing exactly what I want when I invoke exec on it. Examples: 1) send [3, (add 5) ] => receive(obj); obj->exec() -> 8 2) send [3, (add -...
Here's some question about oop in js (questions in the code below). <html> <script> function A(){ a = 'a - private FROM A()'; this.a = 'a - public FROM A()'; this.get_a = function(){ return a; } } function B(){ this.b = 'b - private FROM B()'; this.a = 'a - public FROM B() '; ...
Hi! I have an inheritance hierarchy with overlap. The system knows about People that can be Clients, Providers and Agents. A person have to belong to one of these classes but can belong to two or three, i.e. one Person can be a Client and a Provider at the same time. In the database I think that the problem is solved, one table per clas...
With the following code sample, can super be used, or C has to call A.foo and B.foo explicitly? class A(object): def foo(self): print 'A.foo()' class B(object): def foo(self): print 'B.foo()' class C(A, B): def foo(self): print 'C.foo()' A.foo(self) B.foo(self) ...
I have following class hierarchy interface IBaseModel interface IChildModel_A extends IBaseModel interface IChildModel_B extends IBaseModel class BaseModel implements IBaseModel class ChildModel_A extends BaseModel implements IChildModel_A class ChildModel_B extends BaseModel implements IChildModel_B I am trying to write unit tests f...
Hello, I have an e-shop with multiple product types. And i would have thought of the following structure Cart_Item -- Cart_Product -- Cart_Download Order_Item extends Cart_Item -- Order_Product -- Order_Download The problem is that i want to have Order_Product extend Order_Item and Cart_Product. This is because it needs method gener...
I'm working with a certain API library in Java. It has a base class A, as well as B and C which both extend A. B & C provide similar but distinct functionality, all three classes are in the library. public abstract class A { virtual foo(); } public class B extends A {} public class C extends A {} How do I get elements of A, B, an...
I have defined a Cloneable interface: struct Cloneable { virtual Cloneable * clone(void) const = 0; } I have also some other interface classes (content not relevant to issue): struct Interface { }; struct Useful_Goodies { }; I have created a leaf object which inherits from the above classes: struct Leaf : public Cloneable, publ...
hi i am new to java....moved from objective c (iphone background) all we know that here we cannot use multiple inheritance.... alternative way is interface...... my question is...... does inheritance through interfaces make any sense...because we have to define the code of function in our class.......only helping part here is variabl...
I often encounter in articles which describe abstract class and interface, that C# does not support multiple inheritance but can be achieved using interfaces. I don't agree to that for the following reasons We always inherit the state and behavior from any class. Interface does not define the state or behavior. We cannot inherit anythi...
If I've got three classes like this: class BaseClass(object): def __init__(self, base_arg, base_arg2=None): ... class MixinClass(object): def __init__(self, mixin_arg): ... class ChildClass(BaseClass, MixinClass): def __init__(self, base_arg, mixin_arg, base_arg2=None): ??? What is the correct way...
Matz supposedly said "mixins could do almost everything multiple inheritance do, without the associated drawbacks" (Matz words)." First of all, why is Ruby module inclusion not 'multiple inheritance' ? It seems to me there is very little difference between modules and classes. The fact you cannot instantiate a module is irrelevant when ...