Listing 2 The class istrstream

class istrstream: public istream {
public:
      istrstream(const char* s);
       istrstream(const char* s, int n);
       istrstream(char* s);
       istrstream(char* s, int n);
       virtual ~istrstream();
       strstreambu* rdbuf() const;
       char *str();
private;
//      strstreambuf sb;      exposition only
};