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m-renaud/gist:970493ebbc96b58234cdee21077e0747

Created September 7, 2017 16:23
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gistfile1.txt
data Entry = Entry
{ entryState :: EntryState
, entryPayload :: Maybe Payload
}
data EntryState = NO_ENTRY | IN_PROGRESS | HAS_ENTRY
data Cache = ...
lookup :: Cache -> Key -> Entry
lookupIfKeyPresent :: Cache -> Maybe Key -> Entry
lookupIfKeyPresent _ Nothing = Entry NO_ENTRY Nothing
lookupIfKeyPresent cache (Just k) = lookup cache k
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