31 Input/output library [input.output]

31.10 File-based streams [file.streams]

31.10.5 Class template basic_fstream [fstream]

31.10.5.4 Member functions [fstream.members]

basic_filebuf<charT, traits>* rdbuf() const;

Returns: const_cast<basic_filebuf<charT, traits>*>(addressof(sb)).

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bool is_open() const;

Returns: rdbuf()->is_open().

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void open(
  const char* s,
  ios_base::openmode mode = ios_base::in | ios_base::out);
void open(
  const filesystem::path::value_type* s,
  ios_base::openmode mode = ios_base::in | ios_base::out);  // wide systems only; see [fstream.syn]

Effects: Calls rdbuf()->open(s, mode).

If that function does not return a null pointer calls clear(), otherwise calls setstate(failbit) (which may throw ios_base::failure) ([iostate.flags]).

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void open(
  const string& s,
  ios_base::openmode mode = ios_base::in | ios_base::out);
void open(
  const filesystem::path& s,
  ios_base::openmode mode = ios_base::in | ios_base::out);

Effects: Calls open(s.c_str(), mode).

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void close();

Effects: Calls rdbuf()->close() and, if that function returns a null pointer, calls setstate(failbit) (which may throw ios_base::failure) ([iostate.flags]).