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You have learned that the use of railroad_car objects as
call-by-value parameters can lead to excessive reclamation bugs. The best
way to avoid such bugs is to use call-by-reference parameters instead.
Then, you ensure that you do not inadvertently use a call-by-value
parameter by defining a private copy constructor.
Another way to avoid excessive reclamation is to rewrite the
railroad_car destructor. Now it reads as follows:
virtual ~railroad_car ( ) {delete [ ] serial_number;}
You can change it to
virtual ~railroad_car ( ) { }
What is wrong with this alternative?