29 Input/output library [input.output]

29.9 File-based streams [file.streams]

29.9.5 Class template basic_­fstream [fstream]

29.9.5.2 Constructors [fstream.cons]

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basic_fstream();
1
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Effects: Initializes the base class with basic_­iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_­filebuf<charT, traits>().
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explicit basic_fstream( const char* s, ios_base::openmode mode = ios_base::in | ios_base::out); explicit basic_fstream( const filesystem::path::value_type* s, ios_base::openmode mode = ios_base::in | ios_base::out); // wide systems only; see [fstream.syn]
2
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Effects: Initializes the base class with basic_­iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_­filebuf<charT, traits>().
Then calls rdbuf()->open(s, mode).
If that function returns a null pointer, calls setstate(failbit).
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explicit basic_fstream( const string& s, ios_base::openmode mode = ios_base::in | ios_base::out); explicit basic_fstream( const filesystem::path& s, ios_base::openmode mode = ios_base::in | ios_base::out);
3
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Effects: Equivalent to: basic_­fstream(s.c_­str(), mode).
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basic_fstream(basic_fstream&& rhs);
4
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Effects: Move constructs the base class, and the contained basic_­filebuf.
Then calls basic_­istream<charT, traits>​::​set_­rdbuf(​addressof(sb)) to install the contained basic_­filebuf.