multiple-inheritance

I can not say that this is a question, but more of an opinion request and I am sure many others could benefit from clarifying this issue. Here is my practical case: I have an abstract class called DataExchangeService and a lot of sub-classes that extend this one (this is the base CONTROLLER class in my MVC Framework). The administration modules that handle data definiton (Users,Types,Sections etc) they all have the add,edit,delete,list methods with 100% similarity in most cases. I know that because I replicate them by using only search and replace. Now the thing is not all my

Are multiple-inherited constructors called multiple times? And in what order are constructors called? Does this depend on the order in the inheritance list? Here is an example (it's only for making the situation clear, no real-life example). class Base {}; class DerivedBaseOne : public Base {}; class DerivedBaseTwo : public Base {}; class Derived : public DerivedBaseTwo, public DerivedBaseOne {}; //somewhere in the code, is Base() called two times here? Derived * foo = new Derived(); Is the Base() constructor called twice? And in what order are the constructors called? Base first? Or

I am currently having some troubles when using boost shared_from_this and multiple inheritance. The scenario can be described as follows: Class A implements some functionality and should inherit from shared_from_this Class B implements another functionality and should inherit from shared_from_this Class D inherits functionalities from A and B ( class D : public A, public B {} ) When using some class B functionality from class D I got an exception ( weak_ptr ) To inherit shared_from_this from class D is not an option for me I am not sure about how to solve this. Oh, I am using Visual C++ 2010.

When inheriting from two objects like these class Foo(object): def __init__(self,a): self.a=a class Bar(object): def __init__(self,b): self.b=b I would normally do something like this class FooBar(Foo,Bar): def __init__(self,a,b): Foo.__init__(self,a) Bar.__init__(self,b) How does super know if I want to call both? and if so how will it know which argument to pass where. Or is it simply not possible to user super here? Even if Foo and Bar take the same arguments can super deal with this? Or should I not be trying to do this kind of this in the first place? Using super() , __init__() and

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 to initialize MixinClass and BaseClass ? It doesn't look like I can use super because the MixinClass and the BaseClass both accept different arguments… And two calls, MixinClass.__init__(...) and BaseClass.__init__(...) , will could cause the diamond inheritence problem super is designed to prevent.

I'm using variadic templates with multiple virtual inheritance in C++ to aggregate types into a single structure definition. Here is a sample set of structures: struct meas { int i; }; struct meas2 : public virtual meas { int j; }; struct meas3 : public virtual meas { int k; }; I then aggregate these using multiple virtual inheritance: template <typename... Args> struct zipper : public virtual Args... {}; I can then do: typedef zipper<meas, meas2> meas_type; meas* m = new meas_type; These can then cascade: typedef zipper<meas3, meas_type> meas_type2; The resulting object, however, is rather

I've run into a bit of a problem with my class hierarchy, in a WPF application. It's one of those issues where you have two inheritance trees merging together, and you can't find any logical way to make your inheritance work smoothly without multiple inheritance. I'm wondering if anyone has any bright ideas for getting this kind of system working, without making it impossible to follow or debug. I'm a low-level engineer, so my first thought is always, "Oh! I'll just write some of these classes in native C++, and reference them externally! Then I can have all my old-school OO fun!" Alas, this

i know how to do inheritance in javascript but i can only inherit a single object. eg. function fun1() { this.var1=10; this.meth1=function() { ... ... }; } function fun2() { this.var2=20; this.meth2=function() { ... ... }; } function fun3() { this.var3=30; this.meth3=function() { ... ... }; } now if i want an fun3 object to inherit fun1 object i can do this fun3.prototype=new fun1(); or to inherit fun2 object i can do this fun3.prototype=new fun2(); but how can i inherit both fun1 and fun2 ? Technically, JavaScript does not offer multiple inheritance. Each object has a well-defined single

How many interfaces can a class file implement? Is there a limit on the number of interfaces used by a class file? Thanks in advance. For all practical purposes, there is no limit on the number of interfaces a class can implement, but java does not let you inherit from multiple superclasses. However, if you really want to nitpick, you can say that the number of interfaces a class can implement is bound by the maximum value the interface id can be in java bytecode, or the amount of code memory you have to implement these interfaces, or the amount of hard drive space to store your bytecode.