friend ostream operator for private fields : overload ostream istream operator « Operator Overloading « C++ Tutorial






  1. C++ Tutorial
  2. Operator Overloading
  3. overload ostream istream operator
#include <iostream>
#include <cstring>
using namespace std;

class MyClass {
  // now private
  char name[80];
  int areacode;
  int prefix;
  int num;
public:
  MyClass(char *n, int a, int p, int nm)
  {
    strcpy(name, n);
    areacode = a;
    prefix = p;
    num = nm;
  }
  friend ostream &operator<<(ostream &stream, MyClass o);
};

ostream &operator<<(ostream &stream, MyClass o)
{
  stream << o.name << " ";
  stream << "(" << o.areacode << ") ";
  stream << o.prefix << "-" << o.num << "\n";

  return stream;
}

int main() {
  MyClass a("T", 1, 5, 1);
  MyClass b("A", 3, 5, 5);
  MyClass c("T", 2, 5, 9);

  cout << a << b << c;

  return 0;
}

T (1) 5-1
A (3) 5-5
T (2) 5-9




10.15.overload ostream istream operator
10.15.1.Class level ostream operator and istream operator
10.15.2.istream operator with data check
10.15.3.Class ostream operator
10.15.4.ostream and istream operator for a class
10.15.5.Complex logic in ostream operator
10.15.6.friend ostream operator for private fields
10.15.7.Overload ostream and istream operator
10.15.8.Ignore: manipulator that ignores N lines
10.15.9.Overloading >>: To demonstrate a custom inserter, one will be created for objects of type phonebook, shown here.
10.15.10.Overload << (inserter)