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Showing content from https://timsong-cpp.github.io/cppwp/n4140/fstream.members below:

[fstream.members]

27.9.1.17 Member functions [fstream.members]

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

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

bool is_open() const;

Returns: rdbuf()->is_open().

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

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]).

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

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

void close();

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


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