tYSR20

372Part V: Optional Featuresusing namespace std;// SC - Student comparison function; designed to determine// the sorting order of the studentsstruct SC{bool operator()(const int id1, const int id2) const{return id1 < id2;}};// the map actually contains a Pair; the left element// being the key while the right element is the data (in// this case Student)class Student;typedef Student* SP;typedef pair Pair;typedef map Map;typedef map::iterator MapIterator;// collection of StudentsMap students;// Student - define the important properties of a student// including the key use when looking him/her up// from the student rolls(student id)class Student{public:Student(char* pszName, int id): studentIDKey(id), name(pszName) {}// getKey - the key is used as an index into the mapconst int getKey() { return studentIDKey; }// display - create a meaningful output// for a Student objectstring display(){ostringstream out;out