Our previous version of the SafeArray class used a fixed size array of floats to store user data. To make our class more flexible we are now using the following: private: int Size; vector Array; The private variable "Array" is now a vector of float values. When you read the online documentation for the vector class, you will see that a vector can be used like an array, but there are many methods that allow you to change the size of the vector at run time. We will use the private variable "Size" to store the current size of the "Array" vector.