On May 13, 2010, at 12:01 PM, Michael Ash wrote: > On Thu, May 13, 2010 at 11:52 AM, Louis Gerbarg <[email protected]> wrote: >> On May 13, 2010, at 11:05 AM, Michael Ash <[email protected]> wrote: >> >>> On Thu, May 13, 2010 at 10:56 AM, Thomas Davie <[email protected]> wrote: >>>> >>>> On 13 May 2010, at 15:33, Eric Gorr wrote: >>>> >>>>> So long as it is ok for the string to be unique for the network the user >>>>> is on only. From the docs: >>>>> >>>>> The ID includes the host name, process ID, and a time stamp, which >>>>> ensures that the ID is unique for the network. >>>>> >>>>> A UUID (Universally Unique Identifier) is entirely unique. >>>> >>>> No it's not, as can easily be proven by observing that there are only a >>>> finite number of 40 character strings. A UUID is probabilistically unique. >>> >>> CFUUID includes the MAC address, so unless your MAC address is cloned >>> or you manage to generate two UUIDs on the same device in the same >>> 100ns time interval or the calendar rolls over (which will take about >>> 3700 years), they are entirely unique within the universe of CFUUID >>> strings. >> >> No, it doesn't use the MAC address. MAC addresses are uses as part of type 1 >> uuids, CFUUID has generated type 4 (random) uuids by default since Tiger, >> and has always generated type 4 on iPhone. If you look at the source to CF >> there is a way to force it to generate type 1 uuids, but I doubt that is >> supported. > > Apple ough to update the docs, then, since they say, " UUID is made > unique over both space and time by combining a value unique to the > computer on which it was generated—usually the Ethernet hardware > address...." > > I guess I should know better than to trust Apple's docs by now.
Sigh. Off to file a bug. rdar://7979423 _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
