inheritance

[Solved] Passing Object of SuperClass to the SubClass Constructor in Python

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class super(object): def __init__(self, **kwargs): self.abc = kwargs.pop(‘abc’, None) self.xyz = kwargs.pop(‘xyz’, None) class sub(super): def __init__(self, *args, **kwargs): super().__init__(**kwargs) self.pqr = kwargs.pop(‘pqr’, None) self.sty = kwargs.pop(‘sty’, None) self.contain = args[0] obj_super = super(abc=1, xyz = 2) obj_sub = sub(obj_super, pqr =3, sty=4) print(obj_sub.contain.abc) solved Passing Object of SuperClass to the SubClass Constructor in Python

[Solved] Virtual void not being overridden with override keyword in C# [closed]

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Your Debug.CallObjectEvent() method explicitly instantiates a Call object and calls the overridden method in that class: public static class Debug { internal static void CallObjectEvent(string log) { new Call().CallEvent(new Log(log, Timer.GetTime())); } } The CallEvent() method in the Call class simply calls base.Event(), which resolves to IDebug.Event(). The Program.Event() override is never invoked because Program … Read more

[Solved] If abstract base class contains parameterised constructor (and derived does not) why can’t it be used? [duplicate]

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No, you can’t. It’s a limitation that says ‘each derived class should use (implicitly or explicitly) at least one constructor from base class. In your example, your child class implicitly has parameterless constructor which implicitly uses parameterless constructor from base. So, you need to: either setup parameretised constructor in every derived class or delele this … Read more

[Solved] If abstract base class contains parameterised constructor (and derived does not) why can’t it be used? [duplicate]

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Introduction Abstract base classes are a powerful tool in object-oriented programming, allowing for the creation of a base class that can be extended by derived classes. However, if an abstract base class contains a parameterized constructor, and the derived class does not, it can be difficult to use the abstract base class. This is because … Read more

[Solved] C++: virtual functions with multiple derivations

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You’re right, C::fn() is called when my example is ran alone. My problem actually was that I was dynamically loading this class (C) with ros:pluginlib (http://ros.org/wiki/pluginlib) so the multiple inheritance issue is probably coming from there. That’s a completly different issue I’ll have to look into. solved C++: virtual functions with multiple derivations

[Solved] do I need a virtual function

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It appears that what you want is for your Derived class to support the following interface: someInfo si; someMoreInfo smi; Base* pB = new Derived; // Setting info pB->setInfo(si); // Set the `Base::c` member of `*pB` pB->setInfo(smi); // Set the `Derived::g` member of `*pB` // Getting info someInfo pB_si = pB->getInfo(); // Get `Base::c` from … Read more

[Solved] Creating abstract ViewModels wpf

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Ok, I found the glitch. Int the MainViewModel class, the TestViewModel property should be changed from: public IViewModel TestViewModel { get { return m_testViewModel; } set { m_testViewModel = value; OnPropertyChanged(“NewViewModel”); } } To: public IViewModel TestViewModel { get { return m_testViewModel; } set { m_testViewModel = value; OnPropertyChanged(“TestViewModel”); } } solved Creating abstract ViewModels … Read more

[Solved] Why isn’t C++ inheritance in multiple header and source files working?

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You have a cycle in your header inclusion: MainProgram.h includes FileMgr.h FileMgr.h includes MgrBase.h MgrBase.h includes MainProgram.h You need to break this cycle using forward declarations. The rule in header files should be: if you only need to declare reference or pointer to a type X, forward declare X instead of including the header which … Read more

[Solved] How to reuse a form ( and change its context when needed) to avoid multiple identical forms? C# [closed]

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Why do you need a new form class for each country? The idea of a class is that it holds common behaviours. A form is a class. just instantiate an instance of the class with the data that it needs to display. Create a data class to encapsulate the data that the form shows (like … Read more