gwj / po_oopc · Files

#include <iostream>
#include <string>
using namespace std;
template < class T > void
swap_value (T & var1, T & var2)
{
  T temp;
  temp = var1;
  var1 = var2;
  var2 = temp;
}

class Value
{
private:
    int x;
public:
    Value (int i = 0) :x(i){}
    friend ostream & operator<< (ostream & out, Value v);
};

ostream & operator<< (ostream & out, Value v)
{
  out << "value(" << v.x << ")";
  return out;
}

int
main ()
{
  Value v1 (5), v2 (10);
  cout << "original " << v1 << " " << v2 << endl;
  swap_value (v1, v2);
  cout << "after " << v1 << " " << v2 << endl;
}