Copyright	(c) The University of Glasgow CWI 2001--2015
License	BSD-style (see the file libraries/base/LICENSE)
Safe Haskell	Safe
Language	Haskell2010

Type.Reflection.Unsafe

Contents

Type representations
Kind representations
Type constructors

Description

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

Be warned, these functions can be used to construct ill-kinded type representations.

Synopsis

Type representations

data TypeRep (a :: k) #

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

Instances

TestEquality k (TypeRep k) #
Methods testEquality :: f a -> f b -> Maybe ((TypeRep k :~: a) b) #
Eq (TypeRep k a) #	Since: 2.1
Methods (==) :: TypeRep k a -> TypeRep k a -> Bool Source # (/=) :: TypeRep k a -> TypeRep k a -> Bool Source #
Ord (TypeRep k a) #	Since: 4.4.0.0
Methods compare :: TypeRep k a -> TypeRep k a -> Ordering Source # (<) :: TypeRep k a -> TypeRep k a -> Bool Source # (<=) :: TypeRep k a -> TypeRep k a -> Bool Source # (>) :: TypeRep k a -> TypeRep k a -> Bool Source # (>=) :: TypeRep k a -> TypeRep k a -> Bool Source # max :: TypeRep k a -> TypeRep k a -> TypeRep k a Source # min :: TypeRep k a -> TypeRep k a -> TypeRep k a Source #
Show (TypeRep k a) #
Methods showsPrec :: Int -> TypeRep k a -> ShowS # show :: TypeRep k a -> String # showList :: [TypeRep k a] -> ShowS #

mkTrApp :: forall k1 k2 (a :: k1 -> k2) (b :: k1). TypeRep (a :: k1 -> k2) -> TypeRep (b :: k1) -> TypeRep (a b) #

Construct a representation for a type application.

Note that this is known-key to the compiler, which uses it in desugar Typeable evidence.

mkTyCon #

Arguments

:: String	package name
-> String	module name
-> String	the name of the type constructor
-> Int	number of kind variables
-> KindRep	kind representation
-> TyCon	A unique `TyCon` object Used when the strings are dynamically allocated, eg from binary deserialisation

Exquisitely unsafe.

typeRepFingerprint :: TypeRep a -> Fingerprint #

Observe the Fingerprint of a type representation

Since: 4.8.0.0

someTypeRepFingerprint :: SomeTypeRep -> Fingerprint #

Kind representations

data KindRep :: * Source #

The representation produced by GHC for conjuring up the kind of a TypeRep.

Constructors

KindRepTyConApp TyCon [KindRep]
KindRepVar !KindBndr
KindRepApp KindRep KindRep
KindRepFun KindRep KindRep
KindRepTYPE !RuntimeRep
KindRepTypeLitS TypeLitSort Addr#
KindRepTypeLitD TypeLitSort [Char]

data TypeLitSort :: * Source #

Constructors

TypeLitSymbol
TypeLitNat

Type constructors

data TyCon :: * Source #

Instances

Eq TyCon
Methods (==) :: TyCon -> TyCon -> Bool Source # (/=) :: TyCon -> TyCon -> Bool Source #
Ord TyCon
Methods compare :: TyCon -> TyCon -> Ordering Source # (<) :: TyCon -> TyCon -> Bool Source # (<=) :: TyCon -> TyCon -> Bool Source # (>) :: TyCon -> TyCon -> Bool Source # (>=) :: TyCon -> TyCon -> Bool Source # max :: TyCon -> TyCon -> TyCon Source # min :: TyCon -> TyCon -> TyCon Source #
Show TyCon #	Since: 2.1
Methods showsPrec :: Int -> TyCon -> ShowS # show :: TyCon -> String # showList :: [TyCon] -> ShowS #

mkTrCon :: forall k (a :: k). TyCon -> [SomeTypeRep] -> TypeRep a #

Construct a representation for a type constructor applied at a monomorphic kind.

Note that this is unsafe as it allows you to construct ill-kinded types.

tyConKindRep :: TyCon -> KindRep #

tyConKindArgs :: TyCon -> Int #

tyConFingerprint :: TyCon -> Fingerprint #