When you need a constant integer member in an object, the easiest way to create one is by using a nameless enum, which can be used like any const int:
Passing large objects by value as function arguments is very inefficient. On the other hand, passing them by reference/address is dangerous since it enables the callee to change its arguments
Even experienced C++ programmers who have prior experience with C tend to use pointers excessively whereas references may be a better choice. Pointers may result in bugs like the following: