27 Input/output library [input.output]

27.9 File-based streams [file.streams]

27.9.1 File streams [fstreams]

27.9.1.9 Member functions [ifstream.members]

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

1

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

bool is_open() const;

2

Returns: rdbuf()->is_open().

void open(const char* s, ios_base::openmode mode = ios_base::in);

3

Effects: Calls rdbuf()->open(s, mode | ios_base::in). If that function does not return a null pointer calls clear(), otherwise calls setstate(failbit) (which may throw ios_base::failure ([iostate.flags])).

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

4

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

void close();

5

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