NAME

std::basic_filebuf::close - std::basic_filebuf::close

Synopsis

std::basic_filebuf<CharT, Traits>* close();

If a put area exist (e.g. file was opened for writing), first calls
overflow(Traits::eof()) to write all pending output to the file, including any
unshift sequences.

If the most recently called function, out of underflow(), overflow(), seekpos(), and
seekoff(), was overflow(), then calls std::codecvt::unshift(), perhaps multiple
times, to determine the unshift sequence according to the imbued locale, and writes
that sequence to file with overflow(Traits::eof()).

Then, closes the file as if by calling std::fclose(), regardless of whether any of
the preceding calls succeeded or failed.

If any of the function calls made, including the call to std::fclose(), fails,
returns a null pointer. If any of the function calls made throws an exception, the
exception is caught and rethrown after calling std::fclose(). If the file is already
closed, returns a null pointer right away.

In any case, updates the private member variable that is accessed by is_open().

Parameters

(none)

Return value

this on success, a null pointer on failure.

Notes

close() is typically called through the destructor of std::basic_filebuf (which, in
turn, is typically called by the destructor of std::basic_fstream.

Example