I got this question when I received a code review comment saying virtual functions need not be inline. I thought inline virtual functions could come in handy in scenarios where functions are called on objects directly. But the counter-argument came to my mind is — why would one want to define virtual and then use … Read more
This question already has answers here: What is the difference between an abstract method and a virtual method? (28 answers) Closed 4 years ago. Here is some code from MSDN: // compile with: /target:library public class D { public virtual void DoWork(int i) { // Original implementation. } } public abstract class E : D … Read more
With the struct definition given below… struct A { virtual void hello() = 0; }; Approach #1: struct B : public A { virtual void hello() { … } }; Approach #2: struct B : public A { void hello() { … } }; Is there any difference between these two ways to override the … Read more
As far as I understand, the introduction of override keyword in C++11 is nothing more than a check to make sure that the function being implemented is the overrideing of a virtual function in the base class. Is that it? 6 Answers 6
Suppose I have two C++ classes: class A { public: A() { fn(); } virtual void fn() { _n = 1; } int getn() { return _n; } protected: int _n; }; class B : public A { public: B() : A() {} virtual void fn() { _n = 2; } }; If I write … Read more
Why does C++ not have a virtual constructor? 23 Answers 23
I have heard that C++ class member function templates can’t be virtual. Is this true? If they can be virtual, what is an example of a scenario in which one would use such a function? 15 Answers 15
Say I have classes Foo and Bar set up like this: class Foo { public: int x; virtual void printStuff() { std::cout << x << std::endl; } }; class Bar : public Foo { public: int y; void printStuff() { // I would like to call Foo.printStuff() here… std::cout << y << std::endl; } }; … Read more
I’m getting a warning from ReSharper about a call to a virtual member from my objects constructor. Why would this be something not to do? 1 18 In order to answer your question, consider this question: what will the below code print out when the Child object is instantiated? class Parent { public Parent() { … Read more
I’m learning C++ and I’m just getting into virtual functions. From what I’ve read (in the book and online), virtual functions are functions in the base class that you can override in derived classes. But earlier in the book, when learning about basic inheritance, I was able to override base functions in derived classes without … Read more
