Virtual inheritance in C++

Question

Virtual inheritance in C++

What is it and why is it used in C++?

7

c++

Author: Nicolas Chabanovsky, 2010-10-21

Source

1 answers

score 12 · Accepted Answer

Virtual inheritance is necessary in this situation.

class A { int a; };
class B: public A {};
class C: public A {};
class D: public B, public C {};

In the D class, in this case, there will be two fields named a and they will both belong to the A class. The problem is to determine which variable is being accessed. To avoid this situation, use virtual inheritance. The correct type of ad in this example would be

class A { int a; };
class B: public virtual A {};
class C: public virtual A {};
class D: public B, public C {};