Created
November 3, 2016 16:14
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TLA+ DieHard
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| INIT | |
| Init | |
| NEXT | |
| Next | |
| INVARIANT | |
| TypeOK |
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| ---- MODULE DieHard ---- | |
| EXTENDS Integers, TLC | |
| VARIABLES big, small | |
| TypeOK == /\ big \in 0..5 | |
| /\ small \in 0..3 | |
| BigNot4 == big /= 4 | |
| FillSmall == /\ small' = 3 | |
| /\ big' = big | |
| FillBig == /\ big' = 5 | |
| /\ small' = small | |
| EmptySmall == /\ small' = 0 | |
| /\ big' = big | |
| EmptyBig == /\ big' = 0 | |
| /\ small' = small | |
| Min(m,n) == IF m > n THEN n ELSE m | |
| SmallToBig == | |
| LET poured == Min(big + small, 5) - big | |
| IN /\ big' = big + poured | |
| /\ small' = small - poured | |
| BigToSmall == | |
| LET poured == Min(big + small, 3) - small | |
| IN /\ small' = small + poured | |
| /\ big' = big - poured | |
| Init == /\ big = 0 | |
| /\ small = 0 | |
| Next == \/ FillSmall | |
| \/ FillBig | |
| \/ EmptySmall | |
| \/ EmptyBig | |
| \/ SmallToBig | |
| \/ BigToSmall | |
| ==== |
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