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.NET Forum / Languages / C# / July 2007Creating a unique identifier from 3 ints
Hi, I was just curious how you would go about creating a unique identifier with 3 ints. > Hi, > > I was just curious how you would go about creating a unique identifier > with 3 ints. What is the range of the three inputs? 32-bit signed? What is the data type needed for the output? String? Numeric? Size constraints? DaTurk, I would treat the three integers as components of a larger, 96 bit integer. Because there isn't an algorithm for generating higly-unique 96-bit integers (unlike GUIDs, which are 128 bits), I would suggest starting at 0, and then incrementing by 1 every time you need a new value (across the 96 bits, which you will have to code yourself).  Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > Hi, > > I was just curious how you would go about creating a unique identifier > with 3 ints. For clarification, by 96-bit integer, I mean 96-bit unsigned integer. Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > DaTurk, > [quoted text clipped - 8 lines] >> I was just curious how you would go about creating a unique identifier >> with 3 ints. > DaTurk, > [quoted text clipped - 3 lines] > starting at 0, and then incrementing by 1 every time you need a new value > (across the 96 bits, which you will have to code yourself). Too bad C# doesn't support the obfusc... I mean succinct syntax for handling carry when incrementing a compound integer: ++num1 || ++num2 || ++num3; // num3 is most significant > Hi, > > I was just curious how you would go about creating a unique identifier > with 3 ints. Your question seems a little vague. What are the 3 ints? Just *any* 3 ints? Perhaps a little more about what you are trying to accomplish will suggest some viable alternatives. Chris The reason this seems vague is that you don't state whether you need to get back to the three ints from the unique identifier. If this is the case, there are several options. If it is not a requirement, then just return an incrimented static counter. > Hi, > > I was just curious how you would go about creating a unique identifier > with 3 ints. On Jul 24, 10:06 pm, ModelBuilder <ModelBuil...@discussions.microsoft.com> wrote: > The reason this seems vague is that you don't state whether you need to get > back to the three ints from the unique identifier. If this is the case, [quoted text clipped - 7 lines] > > - Show quoted text - My apologies. I have three signed integers. 32 bit, c# integers. They are part of a structure that I'm going to be storing, but it takes looking at all three of them together to make sure that the structures are not duplicated. SO I was thinking I could just "or" them together, or something of the like to create one unique identifer. I was thinking you could make all three strings, then append them, end to end, and then convert them back to an int. But, it could get bigger then a 64 bit long, which is as big as I want to go. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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