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definition module Heap
import StdEnv
:: Heap v = {heap::!.HeapN v}
:: HeapN v
:: Ptr v = {pointer::!.(PtrN v)};
:: PtrN v = Ptr !v !(HeapN v);
newHeap :: .Heap v
nilPtr :: Ptr v
isNilPtr :: !(Ptr v) -> Bool
newPtr :: !v !*(Heap v) -> (!.Ptr v,!.Heap v)
readPtr :: !(Ptr v) !*(Heap v) -> (!v,!.Heap v)
writePtr :: !(Ptr v) !v !*(Heap v) -> .Heap v
sreadPtr :: !(Ptr v) !(Heap v) -> v
ptrToInt :: !(Ptr w) -> Int
(<:=) infixl
(<:=) heap ptr_and_val :== writePtr ptr val heap
where
(ptr, val) = ptr_and_val
instance == Ptr a
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