bool is_open();
Defined in header
int pcount() const;
C++ includes two input/output libraries: a modern, stream-based I/O library and the standard set of C-style I/O functions. Stream-based I/O
basic_streambuf<CharT, Traits>* pubsetbuf( char_type* s, std::streamsize n
void swap( basic_fstream& other );
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