31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.13 Filesystem operation functions [fs.op.funcs]

31.12.13.20 Is empty [fs.op.is.empty]

bool filesystem::is_empty(const path& p); bool filesystem::is_empty(const path& p, error_code& ec);
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.
Throws: As specified in [fs.err.report].