gistfile1.cpp

#include <iostream>

namespace std {
template <typename T1, typename T2>
ostream& operator<<(ostream& out, const pair<T1,T2>& p) {
  return out << "(" << p.first << "," << p.second << ")";
}
} // end std namespace

int main(int argc, char* argv[]) {
  std::cout << makeTree(10,3.4f) << std::endl;  // => (10,3.4)
  std::cout << makeTree("hello", "20", "world") << std::endl; // => (hello,(20,world))

  std::cout << makeTree(10,20,30,40) << std::endl; // COMPILER ERROR :(
}