class A { public void Foo() {} } class B extends A { } class C extends B { public void Foo() {} } Does C's Foo() override A's even though B did not override it? Or do I have to add a stub in B that calls the super's method for each one I want to override in C? ...
I've been using F# recently and tried to code in a functional way rather than doing OOP all over again in a different syntax. I've now run into a problem that I could solve with a mix of inheritance and discriminated unions but for which I'm trying to find a pure functional style representation. What I want to model is something like th...
The only object oriented programming experience I have is from C#, so PHP is throwing me some curve balls I could use some help with. I have a class I use for all my pages, the "pagebase" if you will. It handles the lowest level html structure. That class is inherited by several other classes. Those classes are the different page types ...
I have two classes. The base class is A. The inherited class is B. I would like copy a base class from one object into the base class of another object without affecting the original class. However, .NET seems to ignore the copying. Is this not possible in .NET. I know this is possible in C++. I have included C++ code to illustrate what ...
Can you provide scenarios when we inherit from a class, it works for a while, but then something else changes and introduces a bug? I came up with the following situation: to implement Rectangle-with-hole, we inherit from class Rectangle. In the constructor, we check that the hole is inside the rectangle Later someone adds a new method...
class Base { public virtual void MethodA(int x) { Console.WriteLine ("In Base Class"); } } class Derived : Base { public override void MethodA(int x) { Console.WriteLine ("In derived INT)"); } public void MethodA(object o) { Console.WriteLine ("In derived OBJECT"); } } class ...
Hello fellows, I have a need where I have to add some new fields to an existing class along with all its existing fields/attributes. So whenever my derived class is filled by DAL, I will be filling all fields of base class as well. Currently, I am doing it like this but not sure this is the right way ? Please give me an example. Also I...
Is inheritance possible for COM objects? Let's say i'd like to ovverride some methods. ...
Hi, I have two lists based on the same class. I would like one list to inherit the values of the other list's class properties. class feature { Guid id; string featureName; string featureType; ..... } List <feature> companyFeatures; List <feature> divisionFeatures; The list of features is set at the company level. When a...
if i want to have 3 classes, which have common fields (and i want them to be static) and they have a common function (which needed to be overridden, i.e virtual) what the best design to do this? do i need to create an interface in a header file and then create it's .cpp file and get the 3 classes inheritance from it? what about the sta...
I am attempting to inherit an ASP.NET RegularExpressionValidator and add some functionality to it. I inherited the control and added my custom properties. However, I would also like the client-side functionality to call a different JavaScript function. In order to do that, I will need to supress what is happening in the AddAttributesToR...
I have a class hierarchy, and each class in it has an exception class, derived in a parallel hierarchy, thus... class Base { }; class Derived : public Base { }; class BaseException : public std::exception { enum {THIS_REASON, THAT_REASON}; }; class DerivedException : public BaseException { // er...what? }; I would like, in t...
I'm currently reading Effective Java by Joshua Bloch and Item 17 is 'Design and document for inheritance or else prohibit it'. The author suggest to prohibit inheritance by default. Is it safe to declare classes final by default and in a later release remove the final keyword if there is a need to extend the class? Will it break backw...
In our project we benefit a lot from the inheritance feature of the PostgreSQL database! We implement the dynamical creation of schemes for different agencies. This structure permits us to solve a lot of security issues which occurs immediately in the case of bulk tables (without partitioning). The only problem we encountered is to gu...
Consider such code: class A (): name = 7 description = 8 color = 9 class B(A): pass Class B now has (inherits) all attributes of class A. For some reason I want B not to inherit attribute 'color'. Is there a possibility to do this? Yes, I know, that I can first create class B with attributes 'name' and 'description' and t...
Good morning peoples. I am mid way through building a very complex application using jquery. In short modules are loaded into iframes (to keep sandboxing and allow for varying things). I am having a bit of trouble referencing the jquery object / library in the iframe (from it's parent). I can write functions that are included in the ...
Possible Duplicate: Why is this not allowed in C++? Why is this not allowed in C++...?? class base { private: public: void func() { cout<<"base"; } }; class derived : private base { private: public: void func() { cout<<"derived"; ...
I am working on a very large Rails application. We initially did not use much inheritance, but we have had some eye opening experiences from a consultant and are looking to refactor some of our models. We have the following pattern a lot in our application: class Project << ActiveRecord::Base has_many :graph_settings end class Graph...
I've got a situation where it seems like the compiler isn't finding the base class definition/implementation of a virtual function with the same name as another member function. struct One {}; struct Two {}; struct Base { virtual void func( One & ); virtual void func( Two & ) = 0; }; struct Derived : public Base { virtual...
Here is a sample piece of code. Note that B is a subclass of A and both provide a unique print routine. Also notice in main that both bind calls are to &A::print, though in the latter case a reference to B is passed. #include <iostream> #include <tr1/functional> struct A { virtual void print() { std::cerr << "A" << std:...