30 Input/output library [input.output]

30.9 File-based streams [file.streams]

30.9.5 Class template basic_­fstream [fstream]

30.9.5.3 Member functions [fstream.members]

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basic_filebuf<charT, traits>* rdbuf() const;
1
#
Returns: const_­cast<basic_­filebuf<charT, traits>*>(&sb).
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bool is_open() const;
2
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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]
3
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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);
4
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Effects: Calls open(s.c_­str(), mode).
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void close();
5
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Effects: Calls rdbuf()->close() and, if that function returns a null pointer, calls setstate(failbit) (which may throw ios_­base​::​failure) ([iostate.flags]).