Defined in header
explicit basic_stringstream( ios_base::openmode mode = ios_base::in|ios_base::out
protected: virtual int_type overflow ( int_type c = Traits::eof()
char_type widen( char c ) const;
int pcount() const;
basic_filebuf(); (1)
void open( const char *filename, ios_base::openmode mode = ios_base::in|ios_base::out
void open( const char *filename, ios_base::openmode mode = ios_base::in
explicit basic_iostream( std::basic_streambuf<CharT,Traits>* sb );
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