Top "Virtual-functions" questions

In object-oriented programming, a virtual function or virtual method is a function or method whose behaviour can be overridden within an inheriting class by a function with the same signature.

Practical usage of virtual functions in c#

What 's the practical usage of virtual functions in c#?

c# virtual-functions
C++ virtual function return type

Is it possible for an inherited class to implement a virtual function with a different return type (not using a …

c++ inheritance virtual-functions overriding return-type
Is the 'override' keyword just a check for a overridden virtual method?

As far as I understand, the introduction of override keyword in C++11 is nothing more than a check to make …

c++ c++11 overriding virtual-functions c++-faq
What are the uses of pure virtual functions in C++?

I'm learning about C++ in a class right now and I don't quite grok pure virtual functions. I understand that …

c++ virtual-functions pure-virtual
QWidget keyPressEvent override

I'm trying for half an eternity now overriding QWidgets keyPressEvent function in QT but it just won't work. I've to …

c++ qt virtual-functions overriding
What if I don't heed the warning "hides inherited member. To make the current member override that implementation...."

This is maybe a fine point, but it concerns the warning that the compiler issues if you do something like: …

c# warnings virtual-functions
Override a member function with different return type

Consider the example below: #include <iostream> using namespace std; class base { public: virtual int func() { cout << "…

c++ virtual-functions overriding redefinition
What is the performance cost of having a virtual method in a C++ class?

Having at least one virtual method in a C++ class (or any of its parent classes) means that the class …

c++ performance virtual-functions
Multiple inheritance + virtual function mess

I have a diamond multiple inheritance scenario like this: A / \ B C \ / D The common parent, A, defines a virtual …

c++ multiple-inheritance virtual-functions diamond-problem
Correct Implementation of Virtual Functions in PHP?

at my working place (php only) we have a base class for database abstraction. When you want to add a …

php oop polymorphism virtual-functions