Portability | non-portable (local universal quantification) |
---|---|

Stability | experimental |

Maintainer | generics@haskell.org |

"Scrap your boilerplate" --- Generic programming in Haskell See http://www.cs.vu.nl/boilerplate/. The present module provides support for multi-parameter traversal, which is also demonstrated with generic operations like equality.

- gfoldlAccum :: Data d => (forall e r. Data e => a -> c (e -> r) -> e -> (a, c r)) -> (forall g. a -> g -> (a, c g)) -> a -> d -> (a, c d)
- gmapAccumT :: Data d => (forall e. Data e => a -> e -> (a, e)) -> a -> d -> (a, d)
- gmapAccumM :: (Data d, Monad m) => (forall e. Data e => a -> e -> (a, m e)) -> a -> d -> (a, m d)
- gmapAccumQl :: Data d => (r -> r' -> r) -> r -> (forall e. Data e => a -> e -> (a, r')) -> a -> d -> (a, r)
- gmapAccumQr :: Data d => (r' -> r -> r) -> r -> (forall e. Data e => a -> e -> (a, r')) -> a -> d -> (a, r)
- gmapAccumQ :: Data d => (forall e. Data e => a -> e -> (a, q)) -> a -> d -> (a, [q])
- gzipWithT :: GenericQ GenericT -> GenericQ GenericT
- gzipWithM :: Monad m => GenericQ (GenericM m) -> GenericQ (GenericM m)
- gzipWithQ :: GenericQ (GenericQ r) -> GenericQ (GenericQ [r])
- geq :: Data a => a -> a -> Bool
- gzip :: GenericQ (GenericM Maybe) -> GenericQ (GenericM Maybe)

# Generic folds and maps that also accumulate

gfoldlAccum :: Data d => (forall e r. Data e => a -> c (e -> r) -> e -> (a, c r)) -> (forall g. a -> g -> (a, c g)) -> a -> d -> (a, c d)Source

gfoldl with accumulation

gmapAccumT :: Data d => (forall e. Data e => a -> e -> (a, e)) -> a -> d -> (a, d)Source

gmapT with accumulation

gmapAccumM :: (Data d, Monad m) => (forall e. Data e => a -> e -> (a, m e)) -> a -> d -> (a, m d)Source

gmapM with accumulation

gmapAccumQl :: Data d => (r -> r' -> r) -> r -> (forall e. Data e => a -> e -> (a, r')) -> a -> d -> (a, r)Source

gmapQl with accumulation

gmapAccumQr :: Data d => (r' -> r -> r) -> r -> (forall e. Data e => a -> e -> (a, r')) -> a -> d -> (a, r)Source

gmapQr with accumulation

gmapAccumQ :: Data d => (forall e. Data e => a -> e -> (a, q)) -> a -> d -> (a, [q])Source

gmapQ with accumulation

# Mapping combinators for twin traversal

gzipWithM :: Monad m => GenericQ (GenericM m) -> GenericQ (GenericM m)Source

Twin map for monadic transformation