C++ Protected member access

Question

need a protected class made to access month day year I understand you need to create a class from the inherited class and not call the protected data in main

#include <iostream>
#include <fstream>

using namespace std;

class dateType
{
   public:
      dateType();
      dateType(int, int, int);
      void setDate(int, int, int);
      void printDate(ostream&)const; 


   protected:
      int month;
      int day;
      int year;
};

ostream& operator<<(ostream &os, const dateType &d) {
   os << d.month << "/" << d.day << "/" << d.year; 
   files 

      return os;
}

when this code executes I get an error saying month, day and year are protected

You can get answers to your problems in [any good text book](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list). — R Sahu, Feb 20 '18 at 20:48

Иван Петров · Answer 1 · 2018-02-20T21:47:34.743

1

Code with friend operator <<.

#include <iostream>
#include <fstream>

using namespace std;

class dateType
{
public:
    dateType();
    dateType(int, int, int);
    void setDate(int, int, int);
    void printDate(ostream&)const;

    friend ostream& operator<<(ostream &os, const dateType &d) {
        os << d.month << "/" << d.day << "/" << d.year;
        return os;
    }


protected:
    int month;
    int day;
    int year;
};

edited Feb 20 '18 at 21:47

answered Feb 20 '18 at 21:07

Иван Петров

11
3

I would argue with your _"have to"_. As well, one can make `operator<<` a `friend`, which might be better solution if getters are otherwise not needed. – Daniel Langr Feb 20 '18 at 21:18
Agreed with you. – Иван Петров Feb 20 '18 at 21:32

score 0 · Answer 2 · answered Feb 20 '18 at 21:29

0

Your method should be friend like this:

friend ostream& operator<<(ostream &os, const dateType &d) 
{
    os << d.getMonth() << "/" << d.getDay() << "/" << d.getYear();
    return os;
}

In your class implementation

answered Feb 20 '18 at 21:29

M.Cuijl

53
5

C++ Protected member access

2 Answers2