30 Input/output library [input.output]

30.10 File systems [filesystems]

30.10.15 Filesystem operation functions [fs.op.funcs] Exists [fs.op.exists]

bool exists(file_status s) noexcept;
Returns: status_­known(s) && s.type() != file_­type​::​not_­found.
bool exists(const path& p); bool exists(const path& p, error_code& ec) noexcept;
Let s be a file_­status, determined as if by status(p) or status(p, ec), respectively.
Effects: The signature with argument ec calls ec.clear() if status_­known(s).
Returns: exists(s).
Throws: As specified in [fs.err.report].