Virtual Default Destructors in C++

Question

I\'ve got a large set of inherited classes (criteria) which inherit from a base class (criterion). Here\'s criterion\'s code

class criterion
{
p         


        

Answer 1

You don't need to make the destructor abstract, just give it a empty implementation:

virtual ~criterion() { }

This way you are not forced to implement it in every child class, but still each of them will have a (inherited) virtual destructor.