Constant U 

pub const U: [c_uchar; 16];

Null value of GUID.

Example

use kdbplus::*;
use kdbplus::api::*;

#[no_mangle]
pub extern "C" fn guid_border(_: K) -> K{
  new_guid(qnull_base::U)
}

q)guid_border: `libapi_examples 2: (`guid_border; 1);
q)guid_border[]
0Ng