bool is_open() const;
int_type sputbackc( char_type c );
void open( const char *filename, ios_base::openmode mode = ios_base::in|ios_base::out
fmtflags setf( fmtflags flags ); (1)
Defined in header
protected: virtual std::basic_streambuf<CharT, Traits>*
bool good() const;
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