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generating unique ID's

General and Gameplay Programming Programming

Started by vaneger April 10, 2004 07:32 PM

3 comments, last by vaneger 20 years ago

vaneger

100

Author

April 10, 2004 07:32 PM

how could i generate 18,446,744,073,709,551,616 unique ID''s? is it even possible to store such data (perhaps only a certain amount at a time)?

Ratman

181

April 10, 2004 07:35 PM

heh what are you trying to do? assign a unique ID for every atom in the universe?

fredizzimo

133

April 10, 2004 07:38 PM

1, 2, 3, 4...18,446,744,073,709,551,616

That''s 18,446,744,073,709,551,616 unieque id''s

antareus

576

April 10, 2004 07:44 PM

GUIDs should be be useful to you.

--God has paid us the intolerable compliment of loving us, in the deepest, most tragic, most inexorable sense.- C.S. Lewis

zealouselixir

256

April 10, 2004 07:46 PM

1.84x10^19 can be represented with 64 bits. You had to have known that.

edit: So, to continue, 2^64 values * 2^6 bits = 1180591620717411303424 bits, which is 140737488355328 Mo. So, practically, speaking, you probably can't store the values along with any meaningful data in a reasonable number of commonly-available modern mass storage devices.

Later,
ZE.

[edited by - zealouselixir on April 10, 2004 8:50:47 PM]

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