Like any RAII type (just think of std::unique_ptr for an example), the two types you worked on in Exercise 18-3 could surely benefit from move members. Modify the solution of the exercise accordingly,...

Like any RAII type (just think of std::unique_ptr for an example), the two types you worked on in Exercise 18-3 could surely benefit from move members. Modify the solution of the exercise accordingly, including a few extra lines in the main() function, to prove that your solution works. Is what you did earlier in Exercise 18-3 still needed now? Also, Exercise 16-6 used a Customer class. Does this type perhaps need move members as well?