Data.Typeable.Internal

The representations of the types TyCon and TypeRep, and the function mkTyCon which is used by derived instances of Typeable to construct a TyCon.

Documentation

data Proxy t

A concrete, poly-kinded proxy type

Constructors

Proxy

Instances

Monad (Proxy *)

Functor (Proxy *)

Applicative (Proxy *)

Foldable (Proxy *)

Traversable (Proxy *)

Bounded (Proxy k s)

Enum (Proxy k s)

Eq (Proxy k s)

Data t => Data (Proxy * t)

Ord (Proxy k s)

Read (Proxy k s)

Show (Proxy k s)

Ix (Proxy k s)

Generic (Proxy * t)

Monoid (Proxy k s)

type Rep (Proxy k t)

data TypeRep

A concrete representation of a (monomorphic) type. TypeRep supports reasonably efficient equality.

Constructors

TypeRep !Fingerprint TyCon [KindRep] [TypeRep]

Instances

Eq TypeRep

Ord TypeRep

Show TypeRep

type KindRep = TypeRep

data Fingerprint

Constructors

Fingerprint !Word64 !Word64

Instances

Eq Fingerprint

Ord Fingerprint

Show Fingerprint

Storable Fingerprint

typeOf :: forall a. Typeable a => a -> TypeRep

typeOf1 :: forall t a. Typeable t => t a -> TypeRep

typeOf2 :: forall t a b. Typeable t => t a b -> TypeRep

typeOf3 :: forall t a b c. Typeable t => t a b c -> TypeRep

typeOf4 :: forall t a b c d. Typeable t => t a b c d -> TypeRep

typeOf5 :: forall t a b c d e. Typeable t => t a b c d e -> TypeRep

typeOf6 :: forall t a b c d e f. Typeable t => t a b c d e f -> TypeRep

typeOf7 :: forall t a b c d e f g. Typeable t => t a b c d e f g -> TypeRep

type Typeable1 a = Typeable a

Deprecated: renamed to Typeable

type Typeable2 a = Typeable a

Deprecated: renamed to Typeable

type Typeable3 a = Typeable a

Deprecated: renamed to Typeable

type Typeable4 a = Typeable a

Deprecated: renamed to Typeable

type Typeable5 a = Typeable a

Deprecated: renamed to Typeable

type Typeable6 a = Typeable a

Deprecated: renamed to Typeable

type Typeable7 a = Typeable a

Deprecated: renamed to Typeable

data TyCon

An abstract representation of a type constructor. TyCon objects can be built using mkTyCon.

Constructors

TyCon

Fields

tyConFingerprint :: !Fingerprint

Since: 4.8.0.0

tyConPackage :: String

Since: 4.5.0.0

tyConModule :: String

Since: 4.5.0.0

tyConName :: String

Since: 4.5.0.0

Instances

Eq TyCon

Ord TyCon

Show TyCon

typeRep :: forall proxy a. Typeable a => proxy a -> TypeRep

Takes a value of type a and returns a concrete representation of that type.

Since: 4.7.0.0

mkTyCon :: Word# -> Word# -> String -> String -> String -> TyCon

mkTyCon3

Arguments

:: String

package name

-> String

module name

-> String

the name of the type constructor

-> TyCon

A unique TyCon object

Builds a TyCon object representing a type constructor. An implementation of Data.Typeable should ensure that the following holds:

 A==A' ^ B==B' ^ C==C' ==> mkTyCon A B C == mkTyCon A' B' C'

mkTyConApp :: TyCon -> [TypeRep] -> TypeRep

Applies a monomorphic type constructor to a sequence of types

mkPolyTyConApp :: TyCon -> [KindRep] -> [TypeRep] -> TypeRep

Applies a polymorhic type constructor to a sequence of kinds and types

mkAppTy :: TypeRep -> TypeRep -> TypeRep

Adds a TypeRep argument to a TypeRep.

typeRepTyCon :: TypeRep -> TyCon

Observe the type constructor of a type representation

class Typeable a where

The class Typeable allows a concrete representation of a type to be calculated.

Methods

typeRep# :: Proxy# a -> TypeRep

mkFunTy :: TypeRep -> TypeRep -> TypeRep

A special case of mkTyConApp, which applies the function type constructor to a pair of types.

splitTyConApp :: TypeRep -> (TyCon, [TypeRep])

Splits a type constructor application. Note that if the type construcotr is polymorphic, this will not return the kinds that were used. See splitPolyTyConApp if you need all parts.

splitPolyTyConApp :: TypeRep -> (TyCon, [KindRep], [TypeRep])

Split a type constructor application

funResultTy :: TypeRep -> TypeRep -> Maybe TypeRep

Applies a type to a function type. Returns: Just u if the first argument represents a function of type t -> u and the second argument represents a function of type t. Otherwise, returns Nothing.

typeRepArgs :: TypeRep -> [TypeRep]

Observe the argument types of a type representation

typeRepFingerprint :: TypeRep -> Fingerprint

Observe the Fingerprint of a type representation

Since: 4.8.0.0

rnfTypeRep :: TypeRep -> ()

Helper to fully evaluate TypeRep for use as NFData(rnf) implementation

Since: 4.8.0.0

showsTypeRep :: TypeRep -> ShowS

tyConString :: TyCon -> String

Deprecated: renamed to tyConName; tyConModule and tyConPackage are also available.

Observe string encoding of a type representation

rnfTyCon :: TyCon -> ()

Helper to fully evaluate TyCon for use as NFData(rnf) implementation

Since: 4.8.0.0

listTc :: TyCon

funTc :: TyCon

typeRepKinds :: TypeRep -> [KindRep]

Observe the argument kinds of a type representation

typeLitTypeRep :: String -> TypeRep

An internal function, to make representations for type literals.