CODEWITHSUNDEEP
c++
MastRofDsastR
MastRofDsastR

Reputation: 161

C++: Creating a vector that points to a class object

I have the following student class, which creates a student, and then allows me to store that student in a students class vector. I want to now have a Courses vector which allows each student to have it's own grouping of courses that they attend. I want these courses to point to the student that owns them so that when a student is removed from the list of students, their courses are also deleted with them. Ideally, I would like to have this courses vector as a private member of the student class, such that these courses can only be accessed/altered when the specific student that owns them is specified.

Main:

#include <iostream>
#include <string>
#include "student.h"
#include "students.h"
using namespace std;


int main(){
  Students stuList;
  Student* bob = new Student ("Bob" "Jones" 10000909);
  stuList.add(bob); 
  return 0;

}

Student h:

#include <ostream>
#include <string>  
class Student {

    public:
    Student::Student(const string & FName, const string & LName, const int ID);

    private:

    string first;
    string last;
    int id;

};

students h:

#include <ostream>
#include <vector>
#include "student.h"
#include <string>

using namespace std;

class Students {

    public:
    Students(); 
    void add(Student & aStudent);

    private:

    vector<Student*> collection;

};

I have been thinking of ways to accomplish this for a while now and I am drawing a blank. Any suggestions/tips would be highly appreciated.

Upvotes: 1

Views: 110

Answers (1)

Alexander Belokon
Alexander Belokon

Reputation: 1522

In the Student class you can add one vector containing the courses owned by the student and additionally one vector for the group of courses attended:

class Student {
   ...
   vector<Course*> ownedCourses;
   vector<Course*> attendedCourses;
};

Then in your class Courses you will need a vector containing all the attendants of this course:

class Course {
    ...
    vector<Student*> attendants;
};

If you now remove a stundent from your list, you will also have the earse all courses owned by him from the lists of the other students:

vector<Course*> ownedCourses = studentToRemove.getOwnedCourses();
for (const Course* course : ownedCourses)
{  
    vector<Student*> attendants = course->getStudents();
    for(const Student* student : attendants) {
        student->removeAttendedCourse(course);
    }
}

Upvotes: 2

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