Constant GUID 

pub const GUID: [u8; 16];

Null value of GUID (0Ng).

Example

use kdbplus::ipc::*;

let q_guid_null = K::new_guid(qnull::GUID);
assert_eq!(
    format!("{}", q_guid_null),
    String::from("00000000-0000-0000-0000-000000000000")
);