Thread: Inheritance, istream, class datamember

Hi.. I am having a slight problem with one of my projects and was wondering if anyone could help. I do not understand why this is not working like it should.

Here is my class(this is a base class for a referencing class).

date.h

Code:

#include <iostream>
using namespace std;

class date  { 
        private:
                int month;
                int day;
                int year;
        public:
                date();
                date(int,int,int);


friend istream &operator >>(istream &in, date &d);
};

date.cpp

Code:

#include "date.h"
#include <iostream>

using namespace std;

date::date() : month(0), day(0), year(0) {}

date::date(int month, int day, int year) {
}

istream &operator >>(istream &in, date &d) {
        in >> d.day >> d.month >> d.year;
        return in;
}

Referencing class
insurance.h

Code:

#include <string>
#include <iostream>
#include "date.h"

using namespace std;

class insurance: public date {
        protected:
                string firstName;
                string lastName;
                char gender;
                date birthDate;
        protected:
                static int total;
        public:
                insurance();
                insurance(string, string, char, date);
                void readInfo(istream &in);          
};

insurance.cxx

Code:

#include "insurance.h"
#include <iostream>
#include <string>

using namespace std;

insurance::insurance() : firstName(""), lastName("") {}

insurance::insurance( string firstName, string lastName, char gender,
                                                        date birthDate) {}

void insurance::readInfo(istream &in) {
        in >> firstName >> lastName >> gender >> birthDate;
}

So, in main when I call the insurance.readinfo(inFile); function, I'm assuming that the stream for the date members should be readinto the date's class datamembers?... However, im unsure if they are being read, or if im just having a problem accessing them..

Would I need to create a member function to "GET" the data members stored in the "insurance.birthDate" Date object? if so how would this be implemented? each time I try to create something like this I get errors saying the datamembers are private...

I want to eventually just use cout like

Code:

cout << getDay(birthDate) << "\n";

to get it to work?

any suggestions?

Unfortunately I cant declare it as protected (project guidelines) so declaring the calss as a friend will work, and does work for that matter, now I just have to get it to print out the correct data :-).

thanks.

Public inheritance models an IS-A relationship, but I highly doubt that insurance IS-A date. So why does insurance inherit from date? In fact, you don't even seem to be using the inherited date data, because you also have a member variable of type date.

I doubt that this is what you want to do. It would make more sense in my opinion to remove the inheritance completely.

As far as your problem (which is separate from the inheritance because you weren't using the inheritance in any way that I could tell), I would suggest not making insurance a friend. It is not necessary. Just make public accessor functions inside the date class similar to the ones you tried inside the insurance class. Then you can call those functions from the accessor functions of the same name inside the insurance class.