#include <iostream>
#include <sstream>

int main()
{
  std::string buf1;
  std::ostringstream formatter1(buf1);

  std::string buf2;
  std::ostringstream formatter2;
  formatter2.str(buf2);

  formatter1 << "Hello World # " << 1 << "\n\nMORE\n";

  formatter2 << std::hex;
  formatter2 << 10 << "|" << 20 << "|" << 30;


  std::cout << "===========================================================\n";

  std::string tmp;

  // returns a std::string by value
  tmp = formatter1.str();

  std::cout << tmp;

  std::cout << "===========================================================\n";


  std::cout << formatter2.str() << "\n";
  std::cout << "===========================================================\n";

  return 0;
}