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deque-blog/ValidBonuses.idr

Last active June 30, 2017 15:28
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ValidBonuses.idr
ValidBonuses : Vect n (Fin (S PinCount)) -> Type
ValidBonuses {n = Z} bonuses = LTE 0 0 -- 1) No bonuses, no constraints
ValidBonuses {n = (S _)} bonuses = -- 2) In case of bonuses:
Either -- Either:
(finToNat (head bonuses) = PinCount) -- * The first roll is 10
(sum (map finToNat bonuses) `LTE` PinCount) -- * Or the sum is less than 10
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