// A4.cpp - swap pointers to arbitrary type

#include <iostream>
#include <iomanip>
using namespace std;

////// start of required answer ///////////////////////////

template <class T> void swapPointers(T *&pT1, T *&pT2) {

  T *temp = pT1;
  pT1 = pT2;
  pT2 = temp;
  return;
}
////// end of required answer /////////////////////////////

void main() {

  double d1 = 3.1415927, d2 = -1.0/3.0;
  double *pD1 = &d1, *pD2 = &d2;

  cout << "\n  inputs are:  " << setw(10) << *pD1 
       << ", " << setw(10) << *pD2;

  swapPointers(pD1, pD2);

  cout << "\n  outputs are: " << setw(10) << *pD1 
       << ", " << setw(10) << *pD2;

  cout << "\n\n";
}