#include <iostream>

using namespace std;

int main() {

  stringstream ss("SS");
  ostringstream os("OS");
  istringstream is("IS");

  ss.get();
  cout << "1:" << ss << endl;
  cout << "2:" << ss.str() << endl;
  cout << "3:" << ss.rdbuf() << endl;
  cout << "4:" << ss.rdbuf()->str() << endl;

  is.get();
  cout << "1:" << is << endl;
  cout << "2:" << is.str() << endl;
  cout << "3:" << is.rdbuf() << endl;
  cout << "4:" << is.rdbuf()->str() << endl;

  //os.get();  // cannot be called on ostringstream
  cout << "1:" << os << endl;
  cout << "2:" << os.str() << endl;
  //cout << "3:" << os.rdbuf() << endl;
  cout << "4:" << os.rdbuf()->str() << endl;

  cout << "---" << endl;

  stringstream ss2;
  ostringstream os2("OS");
  istringstream is2("IS");

  char my1[]="SS2";
  char my2[]="OS2";
  char my3[]="IS2";

  ss2.rdbuf()->pubsetbuf(my1,3);
  os2.rdbuf()->pubsetbuf(my2,3);
  is2.rdbuf()->pubsetbuf(my3,3);

  ss2.get();
  cout << "1:" << ss2 << endl;
  cout << "2:" << ss2.str() << endl;
  cout << "3:" << ss2.rdbuf() << endl;
  cout << "4:" << ss2.rdbuf()->str() << endl;
   
  is2.get();
  cout << "1:" << is2 << endl;
  cout << "2:" << is2.str() << endl;
  cout << "3:" << is2.rdbuf() << endl;
  cout << "4:" << is2.rdbuf()->str() << endl;

  //os2.get(); // cannot be called on ostringstream
  cout << "1:" << os2 << endl;
  cout << "2:" << os2.str() << endl;
  //cout << "3:" << os.rdbuf() << endl;
  cout << "4:" << os2.rdbuf()->str() << endl;

}