多态置换原则初始化基类对象

#include "TStudent.h"

enum EStudentStatus  //大学生系别不同，用枚举分类
{
    eFullTime, ePartTime, eExchange
};

//每学期，每名大学生允许注册的课程数目
const short MAX_COURSES_FOR_STUDENT = 5;//短整型常量
enum EDepartment
{
    eAccounting, eBusiness, eEngineering, eMathematics, ePhysics, eChemistry, eArts, eUnknown
};

TStudent::TStudent(const char theName[],unsigned long theSSN,const char theBirthDate[],const char theAddress[],
    EStudentStatus theStatus,EDepartment theDepartment)
    :TPerson(theName,theSSN,theBirthDate,theAddress)
    _status(theStatus),_department(theDepartment),_numCourses(0)
{
    //现在只需为学生部分执行初始化，课程列表为空
    for (int i = 0; i < MAX_COURSES_FOR_STUDENT; i++)
        _enrolled[i] = 0;
}

TStudent::TStudent(const TStudent& copy)
    :TPerson(copy),
    _status(copy._status),
    _department(copy._department),
    _numCourses(copy._numCourses)
{
    //正确的复制课程
    for (int i = 0; i < MAX_COURSES_FOR_STUDENT; i++)
        if (copy._enrolled[i] != 0)
            this->_enrolled[i] = new TCourse(*copy._enrolled[i]);
}

//赋值操作符
TStudent& TStudent::operator=(const TStudent& other)
{
    if (this == &other) return *this;//自我复制
    TPerson::operator=(other);//调用基类赋值运算符
    this->_status = other._status;
    this->_department = other._department;
    this->_numCourses = other._numCourses;

    //正确地复制课程
    for(int i=0;i<MAX_COURSES_FOR_STUDENT;i++)
        if (this->_enrolled[i] != 0 && other._enrolled[i] == 0)
        {
            delete _enrolled[i];//删除TCourse类对象
        }
        else if (this->_enrolled[i] == 0 && other._enrolled[i] != 0)
        {
            this->_enrolled[i] = new TCourse(*(other._enrolled[i]));
        }
        else if (this->enrolled[i] != 0 && other._enrolled[i] != 0)
        {
            *(this->_enrolled[i]) = *(other._enrolled[i]);
        }
    return *this;
}
TStudent::~TStudent()
{
    for (int i = 0; i < MAX_COURSES_FOR_STUDENT; i++)
    {
        if (this->_enrolled[i] != 0)
        {
            delete _enrolled[i];
        }
    }
}


void TStudent::Print() const
{
    cout << "Name:" << TPerson::GetName() << endl;
    cout << "Address:" << TPerson::GetAddress() << endl;
    cout << "This person is a" << statusLabels[(int)_status] << "Student in the department of" << departmemtNames[(int)_department];
}