|Maintainer||Luke Palmer <email@example.com>|
Provides a minimal infinite, lazy trie for integral types. It intentionally leaves out ideas such as delete and emptiness so that it can be used lazily, eg. as the target of an infinite foldr. Essentially its purpose is to be an efficient implementation of a function from integral type, given point-at-a-time modifications.
A trie from integers to values of type a.
Semantics: [[IntTrie a]] = Integer -> a
Apply the trie to an argument. This is the semantic map.
Modify the function at one point
apply (modify x f t) i | i == x = f (apply t i) | otherwise = apply t i