the ordered_array has a maximum size known as

ordered_array arr(10); // Capacity 10, Size 0

cout << arr.size() << endl; // Should print 0

arr.insert(3);
arr.insert(2);
arr.insert(1);

cout << arr.size() << endl; // Should print 3

// This should print 1, 2, 3
for(int i = 0; i < arr.size(); ++i)
  cout << arr.at(i) << ", ";