swap.cpp

#include <iostream>
#include <string>
 
using namespace std;
class A {
private:
  string name;
public:
  A(string newName) {
    name = newName;
  }
  void SayHi() {
    cout << "Hello from " << name << "\n";
  }
};
void swap(A* a1, A* a2) {
  A temp = *a1;
  *a1 = *a2;
  *a2 = temp;
}
int main() {
  A *a1 = new A("Dog");
  A *a2 = new A("Cat");
  A *a3 = a1;
  swap(a1, a2);
  a1->SayHi();
  a2->SayHi();
  a3->SayHi();
  if (a3 == a2) {
    cout << "Real pass-by-reference swap\n";
  } else {
    cout << "Fake pass-by-value swap\n";
  }
  return 0;
}