Interview Question: why we need a virtual destructor in C++?

Question

Virtual functions aren't cheap, but there is a case when it is necessary for a class destructor to be virtual. Why?

Answer 1

Hi here is the link to previous discussion about this topic. https://www.sololearn.com/Discuss/958953/?ref=app

Answer 2

Thanks Highman !

Answer 3

you are welcome;)

Answer 4

to have more memory when we finish the programm