Effects:

• Determine file_status s, as if by status(p) or status(p, ec), respectively.

• For the signature with argument ec, return false if an error occurred.

• Otherwise, if is_directory(s):

  • Create a variable itr, as if by directory_iterator itr(p) or directory_iterator itr(p, ec), respectively.

  • For the signature with argument ec, return false if an error occurred.

  • Otherwise, return itr == directory_iterator().

• Otherwise:

  • Determine uintmax_t sz, as if by file_size(p) or file_size(p, ec), respectively.

  • For the signature with argument ec, return false if an error occurred.

  • Otherwise, return sz == 0.