Changes the size of the concurrent vector to the requested size, deleting or adding elements as necessary. This method is not concurrency-safe.
If the size of the container is less than the requested size, elements are added to the vector until it reaches the requested size. If the size of the container is larger than the requested size, the elements closest to the end of the container are deleted until the container reaches the size _N. If the present size of the container is the same as the requested size, no action is taken.
resize is not concurrency safe. You must ensure that no other threads are invoking methods on the concurrent vector when you call this method.