50     : stream_(which) {}  in stream_()  function
53     : stream_(str, which) {}  in stream_()  function
56     : stream_(string(str, size), which) {}  in stream_()  function
72   bool eof() const { return stream_.eof(); }  in eof()
73   void clear() { stream_.clear(); }  in clear()
74   string str() const { return stream_.str(); }  in str()
75   void str(const string &s) { stream_.str(s); }  in str()
79     stream_.seekg (0, ios::beg);  in rewind()
80     stream_.seekp (0, ios::beg);  in rewind()
83     stream_.clear();  in rewind()
87   std::stringstream stream_;