Overload stream operator : Stream Operator « Overload « C++

1. C++
2. Overload
3. Stream Operator

Overload stream operator

#include <iostream>
#include <fstream>
using namespace std;

class MyClass {
  int x, y;
public:
  MyClass(int i, int j) { 
     x = i; 
     y = j; 
  }
  friend ostream &operator<<(ostream &stream, MyClass ob);
  friend istream &operator>>(istream &stream, MyClass &ob);
};

ostream &operator<<(ostream &stream, MyClass ob)
{
  stream << ob.x << ' ' << ob.y << '\n';

  return stream;
}

istream &operator>>(istream &stream, MyClass &ob)
{
  stream >> ob.x >> ob.y;

  return stream;
}

int main()
{
  MyClass object1(1, 2), object2(3, 4);
  ofstream out("test");

  if(!out) {
    cout << "Cannot open output file.\n";
    return 1;
  }

  out << object1 << object2;

  out.close();

  ifstream in("test");

  if(!in) {
    cout << "Cannot open input file.\n";
    return 1;
  }

  MyClass object3(0, 0), object4(0, 0);
  in >> object3 >> object4;

  cout << object3 << object4;

  in.close();

  return 0;
}


           
       

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