| Copyright | (c) Luke Palmer 2010 |
|---|---|
| License | BSD3 |
| Maintainer | Luke Palmer <lrpalmer@gmail.com> |
| Stability | experimental |
| Portability | Haskell 2010 |
| Safe Haskell | Safe |
| Language | Haskell2010 |
Data.IntTrie
Description
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.
- data IntTrie a
- identity :: (Num a, Bits a) => IntTrie a
- apply :: (Ord b, Num b, Bits b) => IntTrie a -> b -> a
- modify :: (Ord b, Num b, Bits b) => b -> (a -> a) -> IntTrie a -> IntTrie a
- modify' :: (Ord b, Num b, Bits b) => b -> (a -> a) -> IntTrie a -> IntTrie a
- overwrite :: (Ord b, Num b, Bits b) => b -> a -> IntTrie a -> IntTrie a
- mirror :: IntTrie a -> IntTrie a
- modifyAscList :: (Ord b, Num b, Bits b) => [(b, a -> a)] -> IntTrie a -> IntTrie a
- modifyDescList :: (Ord b, Num b, Bits b) => [(b, a -> a)] -> IntTrie a -> IntTrie a
Documentation
A trie from integers to values of type a.
Semantics: [[IntTrie a]] = Integer -> a
apply :: (Ord b, Num b, Bits b) => IntTrie a -> b -> a Source #
Apply the trie to an argument. This is the semantic map.
modify :: (Ord b, Num b, Bits b) => b -> (a -> a) -> IntTrie a -> IntTrie a Source #
Modify the function at one point
apply (modify x f t) i | i == x = f (apply t i)
| otherwise = apply t imodify' :: (Ord b, Num b, Bits b) => b -> (a -> a) -> IntTrie a -> IntTrie a Source #
Modify the function at one point (strict version)
overwrite :: (Ord b, Num b, Bits b) => b -> a -> IntTrie a -> IntTrie a Source #
Overwrite the function at one point
overwrite i x = modify i (const x)
mirror :: IntTrie a -> IntTrie a Source #
Negate the domain of the function
apply (mirror t) i = apply t (-i) mirror . mirror = id