Creating an Array of Vector Pointers

Question

I have to input a number "N" and create an array of vector pointers so that by using Polymorphism I am able to place different objects at different indexes of the vector. What I'm trying to do:

vector<Vehicle> *ptr(N);

This gives an error, how can I create an array of vector pointers of type?

Answer 1

The standard C++ doesn't support Variable-Length Array (VLA), so you should create a vector of vector pointors instead.

std::vector<vector<Vehicle> *> ptr(N);

If your compiler supports VLA and you want to use that for some reason, you should use [] instead of () .

vector<Vehicle> *ptr[N];