C++/Overload/Stream Operator

Overload stream operator

<source lang="cpp">

1. include <iostream>
2. 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;

}

      </source>