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| Data.Generics.Aliases | | Portability | non-portable (local universal quantification) | | Stability | experimental | | Maintainer | libraries@haskell.org |
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| Description |
| "Scrap your boilerplate" --- Generic programming in Haskell
See http://www.cs.vu.nl/boilerplate/. The present module provides
a number of declarations for typical generic function types,
corresponding type case, and others.
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| Synopsis |
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| mkT :: (Typeable a, Typeable b) => (b -> b) -> a -> a | | | mkQ :: (Typeable a, Typeable b) => r -> (b -> r) -> a -> r | | | mkM :: (Monad m, Typeable a, Typeable b) => (b -> m b) -> a -> m a | | | mkMp :: (MonadPlus m, Typeable a, Typeable b) => (b -> m b) -> a -> m a | | | mkR :: (MonadPlus m, Typeable a, Typeable b) => m b -> m a | | | ext0 :: (Typeable a, Typeable b) => c a -> c b -> c a | | | extT :: (Typeable a, Typeable b) => (a -> a) -> (b -> b) -> a -> a | | | extQ :: (Typeable a, Typeable b) => (a -> q) -> (b -> q) -> a -> q | | | extM :: (Monad m, Typeable a, Typeable b) => (a -> m a) -> (b -> m b) -> a -> m a | | | extMp :: (MonadPlus m, Typeable a, Typeable b) => (a -> m a) -> (b -> m b) -> a -> m a | | | extB :: (Typeable a, Typeable b) => a -> b -> a | | | extR :: (Monad m, Typeable a, Typeable b) => m a -> m b -> m a | | | type GenericT = forall a . Data a => a -> a | | | type GenericQ r = forall a . Data a => a -> r | | | type GenericM m = forall a . Data a => a -> m a | | | type GenericB = forall a . Data a => a | | | type GenericR m = forall a . Data a => m a | | | type Generic c = forall a . Data a => a -> c a | | | data Generic' c = Generic' {} | | | newtype GenericT' = GT {} | | | newtype GenericQ' r = GQ {} | | | newtype GenericM' m = GM {} | | | orElse :: Maybe a -> Maybe a -> Maybe a | | | recoverMp :: MonadPlus m => GenericM m -> GenericM m | | | recoverQ :: MonadPlus m => r -> GenericQ (m r) -> GenericQ (m r) | | | choiceMp :: MonadPlus m => GenericM m -> GenericM m -> GenericM m | | | choiceQ :: MonadPlus m => GenericQ (m r) -> GenericQ (m r) -> GenericQ (m r) | | | ext1T :: (Data d, Typeable1 t) => (forall d . Data d => d -> d) -> (forall d . Data d => t d -> t d) -> d -> d | | | ext1M :: (Monad m, Data d, Typeable1 t) => (forall d . Data d => d -> m d) -> (forall d . Data d => t d -> m (t d)) -> d -> m d | | | ext1Q :: (Data d, Typeable1 t) => (d -> q) -> (forall d . Data d => t d -> q) -> d -> q | | | ext1R :: (Monad m, Data d, Typeable1 t) => m d -> (forall d . Data d => m (t d)) -> m d |
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| Combinators to "make" generic functions via cast
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| mkT :: (Typeable a, Typeable b) => (b -> b) -> a -> a |
| Make a generic transformation;
start from a type-specific case;
preserve the term otherwise
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| mkQ :: (Typeable a, Typeable b) => r -> (b -> r) -> a -> r |
| Make a generic query;
start from a type-specific case;
return a constant otherwise
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| mkM :: (Monad m, Typeable a, Typeable b) => (b -> m b) -> a -> m a |
| Make a generic monadic transformation;
start from a type-specific case;
resort to return otherwise
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| mkMp :: (MonadPlus m, Typeable a, Typeable b) => (b -> m b) -> a -> m a |
| Make a generic monadic transformation for MonadPlus;
use "const mzero" (i.e., failure) instead of return as default.
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| mkR :: (MonadPlus m, Typeable a, Typeable b) => m b -> m a |
| Make a generic builder;
start from a type-specific ase;
resort to no build (i.e., mzero) otherwise
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| ext0 :: (Typeable a, Typeable b) => c a -> c b -> c a |
| Flexible type extension
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| extT :: (Typeable a, Typeable b) => (a -> a) -> (b -> b) -> a -> a |
| Extend a generic transformation by a type-specific case
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| extQ :: (Typeable a, Typeable b) => (a -> q) -> (b -> q) -> a -> q |
| Extend a generic query by a type-specific case
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| extM :: (Monad m, Typeable a, Typeable b) => (a -> m a) -> (b -> m b) -> a -> m a |
| Extend a generic monadic transformation by a type-specific case
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| extMp :: (MonadPlus m, Typeable a, Typeable b) => (a -> m a) -> (b -> m b) -> a -> m a |
| Extend a generic MonadPlus transformation by a type-specific case
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| extB :: (Typeable a, Typeable b) => a -> b -> a |
| Extend a generic builder
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| extR :: (Monad m, Typeable a, Typeable b) => m a -> m b -> m a |
| Extend a generic reader
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| Type synonyms for generic function types
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| type GenericT = forall a . Data a => a -> a |
| Generic transformations,
i.e., take an "a" and return an "a"
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| type GenericQ r = forall a . Data a => a -> r |
| Generic queries of type "r",
i.e., take any "a" and return an "r"
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| type GenericM m = forall a . Data a => a -> m a |
| Generic monadic transformations,
i.e., take an "a" and compute an "a"
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| type GenericB = forall a . Data a => a |
| Generic builders
i.e., produce an "a".
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| type GenericR m = forall a . Data a => m a |
| Generic readers, say monadic builders,
i.e., produce an "a" with the help of a monad "m".
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| type Generic c = forall a . Data a => a -> c a |
| The general scheme underlying generic functions
assumed by gfoldl; there are isomorphisms such as
GenericT = Generic T.
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| data Generic' c |
| Wrapped generic functions;
recall: [Generic c] would be legal but [Generic' c] not.
| | Constructors | |
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| newtype GenericT' |
| Other first-class polymorphic wrappers
| | Constructors | | GT | | | unGT :: (Data a => a -> a) | |
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| newtype GenericQ' r |
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| newtype GenericM' m |
| Constructors | | GM | | | unGM :: (Data a => a -> m a) | |
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| Inredients of generic functions
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| orElse :: Maybe a -> Maybe a -> Maybe a |
| Left-biased choice on maybies
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| Function combinators on generic functions
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| recoverMp :: MonadPlus m => GenericM m -> GenericM m |
| Recover from the failure of monadic transformation by identity
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| recoverQ :: MonadPlus m => r -> GenericQ (m r) -> GenericQ (m r) |
| Recover from the failure of monadic query by a constant
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| choiceMp :: MonadPlus m => GenericM m -> GenericM m -> GenericM m |
| Choice for monadic transformations
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| choiceQ :: MonadPlus m => GenericQ (m r) -> GenericQ (m r) -> GenericQ (m r) |
| Choice for monadic queries
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| Type extension for unary type constructors
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| ext1T :: (Data d, Typeable1 t) => (forall d . Data d => d -> d) -> (forall d . Data d => t d -> t d) -> d -> d |
| Type extension of transformations for unary type constructors
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| ext1M :: (Monad m, Data d, Typeable1 t) => (forall d . Data d => d -> m d) -> (forall d . Data d => t d -> m (t d)) -> d -> m d |
| Type extension of monadic transformations for type constructors
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| ext1Q :: (Data d, Typeable1 t) => (d -> q) -> (forall d . Data d => t d -> q) -> d -> q |
| Type extension of queries for type constructors
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| ext1R :: (Monad m, Data d, Typeable1 t) => m d -> (forall d . Data d => m (t d)) -> m d |
| Type extension of readers for type constructors
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| Produced by Haddock version 0.8 |
