实现 UML 序列图

Question

My question is relatively simple: how would I go about implementing a UML sequence diagram in C++ code? I was reading up on sequence diagrams the other day, and I found this example for a program for a student enrolling in a seminar.

How would I go about turning this diagram into a program? For the sake of this question, lets focus on one class, say the EnrollInSeminar controller. How would I go about implementing this?

I imagine that it might be something like this:

class EnrollInSeminar
{
public:
  void Activate();
};

void EnrollInSeminar::Activate()
{
  SecurityLogon logonUI{};
  Student theStudent = logonUI.getStudent();
  SeminarSelector seminarSelectorUI{};
  Seminar seminar = seminarSelectorUI.getSeminar();
  if (!seminar.isEligible(theStudent))
    return;
  theStudent.getSchedule().determineFit(seminar);
  Fee fee = StudentFees.calculateFees(seminar, theStudent);
  FeeDisplay feeUI{fee};
  if (!feeUI.getVerification())
    return;
  seminar.enrollStudent(theStudent);
}

Is this the correct way to implement the EnrollInSeminar class? If not, how should I do it?

Answer 1

Actually a SD does not tell anything about the methods being used in the messages passed from one object to another except the name, the parameters and - as the name says - the sequence. So the only thing you can draw from "just the SD" are methods and their parameters.

You will need additional information from a use case to know what the methods are all about. Without you simply can not "implement a SD".