Материал из C\C++ эксперт
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;
}
