30 Input/output library [input.output]

30.10 File systems [filesystems]

30.10.15 Filesystem operation functions [fs.op.funcs]

30.10.15.13 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].