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Re: [tlaplus] Autoincrement

Your spec seems fine, assuming that there are several counters and not just the single one Id.  If Id were the only one, there's no need for NextId to have a parameter; you could define it simply to equal Id' = Id + 1.
I would probably eliminate the definition of NextId and simply write Id' = Id + 1 in the definition of NextAction, but that's just a matter of taste.
Leslie Lamport

On Tue, Oct 23, 2012 at 10:36 AM, Y2i <yur...@xxxxxxxxx> wrote:
I wanted to ask for an advice on how to model values that should auto-increment when the next value is used, similar to auto-increment of database IDs when a new record is inserted.

My current thinking is:


Init == Id = 0 /\ ...

NextId(x) == x' = x + 1

SomeAction == NextId(Id) /\ use_id_here

Is this too complicated?  May be there is a simpler way to model this?

Thank you in advance,


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