QUuid change variant

[MadBee]

Hi!
I saw in documentation for QUuid have variants. but I didn't get how to generate it.
if I generate by var = QUuid::createUuid();
var.variant() - shows '2'
but how to change it? how to generate uuid with variant 4?
thanks in advance

[ChrisW67]

@MadBee I think you are confusing the UUID variant (DCE, the variant described in RFC 4122) with the UUID version (a sub-type of variant):

The following table lists the currently-defined versions for this
   UUID variant.

   Msb0  Msb1  Msb2  Msb3   Version  Description

    0     0     0     1        1     The time-based version
                                     specified in this document.

    0     0     1     0        2     DCE Security version, with
                                     embedded POSIX UIDs.

    0     0     1     1        3     The name-based version
                                     specified in this document
                                     that uses MD5 hashing.

    0     1     0     0        4     The randomly or pseudo-
                                     randomly generated version
                                     specified in this document.

    0     1     0     1        5     The name-based version
                                     specified in this document
                                     that uses SHA-1 hashing.

You get a version 4 (random) UUID by default QUuid::createUuid() but there are similar functions to create version 3 and 5 UUIDs. You can construct a QUuid object specifying all the components yourself to obtain a UUID of any variant or version.