29 Input/output library [input.output]

29.9 File-based streams [file.streams]

29.9.3 Class template basic_­ifstream [ifstream]

29.9.3.2 Constructors [ifstream.cons]

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basic_ifstream();
1
#
Effects: Initializes the base class with basic_­istream<charT, traits>(addressof(sb)) ([istream.cons]) and sb with basic_­filebuf<charT, traits>() ([filebuf.cons]).
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explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in); explicit basic_ifstream(const filesystem::path::value_type* s, ios_base::openmode mode = ios_base::in); // wide systems only; see [fstream.syn]
2
#
Effects: Initializes the base class with basic_­istream<charT, traits>(addressof(sb)) ([istream.cons]) and sb with basic_­filebuf<charT, traits>() ([filebuf.cons]), then calls rdbuf()->open(s, mode | ios_­base​::​in).
If that function returns a null pointer, calls setstate(failbit).
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explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in); explicit basic_ifstream(const filesystem::path& s, ios_base::openmode mode = ios_base::in);
3
#
Effects: Equivalent to: basic_­ifstream(s.c_­str(), mode).
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basic_ifstream(basic_ifstream&& 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.