How to release std::vector if there is no heap memory

Question

I have a class member variable like this:

vector >  m_stacks;

When I populate it, I do like this:

v         


        

Answer 1

The destructor for a vector will do two things: it will destroy each element of the vector, then it will free the memory used for the vector itself. This is automatic.

In your case you have vectors nested two deep, but it doesn't matter. When the top level vector is destroyed it will call the destructor for each vector it contains, and all of those vectors will clean themselves up properly.