Chapter 16, Using the Observer Pattern

1. a – b. Please see Assessments/Chapter16/Chp16-Q1.cpp in the GitHub repository.
2. Other examples which may easily incorporate the Observer pattern include any application requiring customers to receive notification of backordered products that they desire. For example, many people may wish to receive the Covid-19 vaccine and wish to be on a waiting list at a vaccine distribution site. Here, a VaccineDistributionSite (the subject of interest) can be inherited from Subject and contain a list of Person objects, where Person inherits from Observer. The Person objects will contain a pointer to the VaccineDistributionSite. Once enough supply for the vaccine exists at a given VaccineDistributionSite (that is, a distribution event has occurred), Notify() can be called to update the Observer instances (people on the waitlist). Each Observer will be sent an Update(), which will be the means to allow that person to schedule an appointment. If...