Hjælp til public medlemsfunktioner.

#include <iostream>

class Class
{
public:
  Class(int aValue) : Value(aValue) {}
  Class& operator = (const Class& aRhs) {Value = aRhs.Value; return *this; }
  friend Class operator + (const Class& alhs, const Class& aRhs);
  friend std::ostream& operator << (std::ostream& os, const Class& aRhs);
private:
  int Value;
};

Class operator + (const Class& aLhs, const Class& aRhs)
{
  Class C(aLhs.Value + aRhs.Value);
  return C;
}

std::ostream& operator << (std::ostream& os, const Class& aRhs)
{
  os << aRhs.Value;
  return os;
}

int main()
{
  Class C(123), D(321);
  std::cout << "C: " << C << std::endl;
  C = D;
  std::cout << "C: " << C << std::endl;
  Class X = C + D;
  std::cout << "X: " << X << std::endl;
}