将对象从另一个类传递给 C++ 中另一个类的构造函数？

Question

I have 2 classes - in the second one I want to pass an object of the class CAdress and via its explicit constrcutor , assign the member ar from the class CStudent the corresponding values? I would like to ask how can I do this? Thanks in advance!

class CAdress {
    string street;
    string postal;
    string city;
public:
    CAdress() {
        street = "Studentska #1";
        postal = "9010";
        city = "Varna";
    };
    CAdress(string st, string pos, string ct) {
        street = st;
        postal = pos;
        city = ct;
    }
};



  class CStudent : public CPerson2 {
        string fn;
        CAdress adr;
    public:
        CStudent() {
            fn = "12131547";
        }
        CStudent(string nm, CAdress add, string egnn) {
            name = nm;
            //how to give values to the adress?
            //add = ?
            egn = egnn;

        }

    };

Answer 1

It is more efficient to do it like this

CStudent (const string& nm, const CAdress& add, const string& egnn) :
     name (nm),
     adr (add),
     egn (egnn) {}

For reference read https://en.cppreference.com/w/cpp/language/initializer_list .

Answer 2

You can create a copy constructor and copy the value directly. https://www.geeksforgeeks.org/copy-constructor-in-cpp/ . By default the compiler provides one, but it only does the shallow copy. So its better to create one sometimes.

    CStudent(string nm, CAdress add, string egnn) {
        name = nm;
        adr = add;
        egn = egnn;
    }