How to change the size of dynamic array in c++(like realloc in c)

dynamic_array.cpp

#define MIN(a, b) a < b ? a : b

void changeSize(int* &arr, int &size, int newSize) {
  // Allocate a new array
  int* newArray = new int[newSize];
  // Copy all elements to the new array
  for(int i = 0; i < MIN(size, newSize); ++i) {
    newArray[i] = arr[i];
  }
  // Free and assign the new Array
  delete[] arr;
  arr = newArray;
  size = newSize;
}