On Fri, Sep 23, 2011 at 3:22 PM, Denis Kudriashov <[email protected]>wrote:
> I am sure I see It in some block bost. But dont remember > > Ok, but GC can move objects arround. If you stick to that value as #hash then you dictionaries will be screw...you would need a rehash. But you don't know when to trigger it ;) > > 2011/9/23 Mariano Martinez Peck <[email protected]> > >> >> >> On Fri, Sep 23, 2011 at 3:02 PM, Denis Kudriashov >> <[email protected]>wrote: >> >>> Thank you for all your responses. I will use UUID. >>> >>> Another assumption: >>> I know there is a trick to get object memory address. >>> >> >> which one? >> >> >>> Can it be used for object identity? (inside memory of objects) >>> >>> >>> >>> * >>> * >>> 2011/9/23 Marcus Denker <[email protected]> >>> >>>> >>>> On Sep 23, 2011, at 1:08 PM, Denis Kudriashov wrote: >>>> >>>> > Hello, >>>> > >>>> > I use hash message to generate unique object id. (unique between >>>> current memory objects). >>>> > And I catch situation when two objects has same hash value. Objects >>>> has been created in loop almost at same time. >>>> > >>>> > So my question - is it really possible? >>>> >>>> Yes, easily, as there are only 12 bits for the hash, there are only 4096 >>>> different hash values. >>>> >>>> This means that a hash is *not* at all a UUID, and all hashing data >>>> structures need to be optimized >>>> for the case of hash collision, as it will happen a lot. >>>> >>>> Marcus >>>> >>>> >>>> -- >>>> Marcus Denker -- http://marcusdenker.de >>>> >>>> >>>> >>> >> >> >> -- >> Mariano >> http://marianopeck.wordpress.com >> >> > -- Mariano http://marianopeck.wordpress.com
