Copyright | (c) Universiteit Utrecht 2010-2011 University of Oxford 2012-2014 |
---|---|
License | see libraries/base/LICENSE |
Maintainer | libraries@haskell.org |
Stability | internal |
Portability | non-portable |
Safe Haskell | Trustworthy |
Language | Haskell2010 |
If you're using GHC.Generics
, you should consider using the
http://hackage.haskell.org/package/generic-deriving package, which
contains many useful generic functions.
Since: 4.6.0.0
Synopsis
- data V1 (p :: k)
- data U1 (p :: k) = U1
- newtype Par1 p = Par1 {
- unPar1 :: p
- newtype Rec1 (f :: k -> Type) (p :: k) = Rec1 {
- unRec1 :: f p
- newtype K1 (i :: Type) c (p :: k) = K1 {
- unK1 :: c
- newtype M1 (i :: Type) (c :: Meta) (f :: k -> Type) (p :: k) = M1 {
- unM1 :: f p
- data ((f :: k -> Type) :+: (g :: k -> Type)) (p :: k)
- data ((f :: k -> Type) :*: (g :: k -> Type)) (p :: k) = (f p) :*: (g p)
- newtype ((f :: k2 -> Type) :.: (g :: k1 -> k2)) (p :: k1) = Comp1 {
- unComp1 :: f (g p)
- data family URec (a :: Type) (p :: k)
- type UAddr = URec (Ptr ())
- type UChar = URec Char
- type UDouble = URec Double
- type UFloat = URec Float
- type UInt = URec Int
- type UWord = URec Word
- type Rec0 = K1 R
- data R
- type D1 = M1 D
- type C1 = M1 C
- type S1 = M1 S
- data D
- data C
- data S
- class Datatype d where
- datatypeName :: t d (f :: k -> Type) (a :: k) -> [Char]
- moduleName :: t d (f :: k -> Type) (a :: k) -> [Char]
- packageName :: t d (f :: k -> Type) (a :: k) -> [Char]
- isNewtype :: t d (f :: k -> Type) (a :: k) -> Bool
- class Constructor c where
- class Selector s where
- selName :: t s (f :: k -> Type) (a :: k) -> [Char]
- selSourceUnpackedness :: t s (f :: k -> Type) (a :: k) -> SourceUnpackedness
- selSourceStrictness :: t s (f :: k -> Type) (a :: k) -> SourceStrictness
- selDecidedStrictness :: t s (f :: k -> Type) (a :: k) -> DecidedStrictness
- data Fixity
- data FixityI
- data Associativity
- prec :: Fixity -> Int
- data SourceUnpackedness
- data SourceStrictness
- data DecidedStrictness
- data Meta
- class Generic a where
- class Generic1 (f :: k -> Type) where
Introduction
Datatype-generic functions are based on the idea of converting values of
a datatype T
into corresponding values of a (nearly) isomorphic type
.
The type Rep
T
is
built from a limited set of type constructors, all provided by this module. A
datatype-generic function is then an overloaded function with instances
for most of these type constructors, together with a wrapper that performs
the mapping between Rep
TT
and
. By using this technique, we merely need
a few generic instances in order to implement functionality that works for any
representable type.Rep
T
Representable types are collected in the Generic
class, which defines the
associated type Rep
as well as conversion functions from
and to
.
Typically, you will not define Generic
instances by hand, but have the compiler
derive them for you.
Representing datatypes
The key to defining your own datatype-generic functions is to understand how to represent datatypes using the given set of type constructors.
Let us look at an example first:
data Tree a = Leaf a | Node (Tree a) (Tree a)
deriving Generic
The above declaration (which requires the language pragma DeriveGeneric
)
causes the following representation to be generated:
instanceGeneric
(Tree a) where typeRep
(Tree a) =D1
('MetaData "Tree" "Main" "package-name" 'False) (C1
('MetaCons "Leaf" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0
a)):+:
C1
('MetaCons "Node" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0
(Tree a)):*:
S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0
(Tree a)))) ...
Hint: You can obtain information about the code being generated from GHC by passing
the -ddump-deriv
flag. In GHCi, you can expand a type family such as Rep
using
the :kind!
command.
This is a lot of information! However, most of it is actually merely meta-information that makes names of datatypes and constructors and more available on the type level.
Here is a reduced representation for Tree
with nearly all meta-information removed,
for now keeping only the most essential aspects:
instanceGeneric
(Tree a) where typeRep
(Tree a) =Rec0
a:+:
(Rec0
(Tree a):*:
Rec0
(Tree a))
The Tree
datatype has two constructors. The representation of individual constructors
is combined using the binary type constructor :+:
.
The first constructor consists of a single field, which is the parameter a
. This is
represented as
.Rec0
a
The second constructor consists of two fields. Each is a recursive field of type Tree a
,
represented as
. Representations of individual fields are combined using
the binary type constructor Rec0
(Tree a):*:
.
Now let us explain the additional tags being used in the complete representation:
- The
tag indicates several things. TheS1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy)'Nothing
indicates that there is no record field selector associated with this field of the constructor (if there were, it would have been marked'Just "recordName"
instead). The other types contain meta-information on the field's strictness: - There is no
{-# UNPACK #-}
or{-# NOUNPACK #-}
annotation in the source, so it is tagged with'NoSourceUnpackedness
. - There is no strictness (
!
) or laziness (~
) annotation in the source, so it is tagged with'NoSourceStrictness
. - The compiler infers that the field is lazy, so it is tagged with
'DecidedLazy
. Bear in mind that what the compiler decides may be quite different from what is written in the source. SeeDecidedStrictness
for a more detailed explanation.
The 'MetaSel
type is also an instance of the type class Selector
,
which can be used to obtain information about the field at the value
level.
- The
andC1
('MetaCons "Leaf" 'PrefixI 'False)
invocations indicate that the enclosed part is the representation of the first and second constructor of datatypeC1
('MetaCons "Node" 'PrefixI 'False)Tree
, respectively. Here, the meta-information regarding constructor names, fixity and whether it has named fields or not is encoded at the type level. The'MetaCons
type is also an instance of the type classConstructor
. This type class can be used to obtain information about the constructor at the value level. - The
tag indicates that the enclosed part is the representation of the datatypeD1
('MetaData "Tree" "Main" "package-name" 'False)Tree
. Again, the meta-information is encoded at the type level. The'MetaData
type is an instance of classDatatype
, which can be used to obtain the name of a datatype, the module it has been defined in, the package it is located under, and whether it has been defined usingdata
ornewtype
at the value level.
Derived and fundamental representation types
There are many datatype-generic functions that do not distinguish between positions that are parameters or positions that are recursive calls. There are also many datatype-generic functions that do not care about the names of datatypes and constructors at all. To keep the number of cases to consider in generic functions in such a situation to a minimum, it turns out that many of the type constructors introduced above are actually synonyms, defining them to be variants of a smaller set of constructors.
Individual fields of constructors:
K1
The type constructor Rec0
is a variant of K1
:
typeRec0
=K1
R
Here, R
is a type-level proxy that does not have any associated values.
There used to be another variant of K1
(namely Par0
), but it has since
been deprecated.
Meta information:
M1
The type constructors S1
, C1
and D1
are all variants of M1
:
typeS1
=M1
S
typeC1
=M1
C
typeD1
=M1
D
The types S
, C
and D
are once again type-level proxies, just used to create
several variants of M1
.
Additional generic representation type constructors
Next to K1
, M1
, :+:
and :*:
there are a few more type constructors that occur
in the representations of other datatypes.
Empty datatypes:
V1
For empty datatypes, V1
is used as a representation. For example,
data Empty deriving Generic
yields
instanceGeneric
Empty where typeRep
Empty =D1
('MetaData "Empty" "Main" "package-name" 'False)V1
Constructors without fields:
U1
If a constructor has no arguments, then U1
is used as its representation. For example
the representation of Bool
is
instanceGeneric
Bool where typeRep
Bool =D1
('MetaData "Bool" "Data.Bool" "package-name" 'False) (C1
('MetaCons "False" 'PrefixI 'False)U1
:+:
C1
('MetaCons "True" 'PrefixI 'False)U1
)
Representation of types with many constructors or many fields
As :+:
and :*:
are just binary operators, one might ask what happens if the
datatype has more than two constructors, or a constructor with more than two
fields. The answer is simple: the operators are used several times, to combine
all the constructors and fields as needed. However, users /should not rely on
a specific nesting strategy/ for :+:
and :*:
being used. The compiler is
free to choose any nesting it prefers. (In practice, the current implementation
tries to produce a more-or-less balanced nesting, so that the traversal of
the structure of the datatype from the root to a particular component can be
performed in logarithmic rather than linear time.)
Defining datatype-generic functions
A datatype-generic function comprises two parts:
- Generic instances for the function, implementing it for most of the representation type constructors introduced above.
- A wrapper that for any datatype that is in
Generic
, performs the conversion between the original value and itsRep
-based representation and then invokes the generic instances.
As an example, let us look at a function encode
that produces a naive, but lossless
bit encoding of values of various datatypes. So we are aiming to define a function
encode :: Generic
a => a -> [Bool]
where we use Bool
as our datatype for bits.
For part 1, we define a class Encode'
. Perhaps surprisingly, this class is parameterized
over a type constructor f
of kind * -> *
. This is a technicality: all the representation
type constructors operate with kind * -> *
as base kind. But the type argument is never
being used. This may be changed at some point in the future. The class has a single method,
and we use the type we want our final function to have, but we replace the occurrences of
the generic type argument a
with f p
(where the p
is any argument; it will not be used).
class Encode' f where encode' :: f p -> [Bool]
With the goal in mind to make encode
work on Tree
and other datatypes, we now define
instances for the representation type constructors V1
, U1
, :+:
, :*:
, K1
, and M1
.
Definition of the generic representation types
In order to be able to do this, we need to know the actual definitions of these types:
dataV1
p -- lifted version of Empty dataU1
p =U1
-- lifted version of () data (:+:
) f g p =L1
(f p) |R1
(g p) -- lifted version ofEither
data (:*:
) f g p = (f p):*:
(g p) -- lifted version of (,) newtypeK1
i c p =K1
{unK1
:: c } -- a container for a c newtypeM1
i t f p =M1
{unM1
:: f p } -- a wrapper
So, U1
is just the unit type, :+:
is just a binary choice like Either
,
:*:
is a binary pair like the pair constructor (,)
, and K1
is a value
of a specific type c
, and M1
wraps a value of the generic type argument,
which in the lifted world is an f p
(where we do not care about p
).
Generic instances
The instance for V1
is slightly awkward (but also rarely used):
instance Encode' V1
where
encode' x = undefined
There are no values of type V1 p
to pass (except undefined), so this is
actually impossible. One can ask why it is useful to define an instance for
V1
at all in this case? Well, an empty type can be used as an argument to
a non-empty type, and you might still want to encode the resulting type.
As a somewhat contrived example, consider [Empty]
, which is not an empty
type, but contains just the empty list. The V1
instance ensures that we
can call the generic function on such types.
There is exactly one value of type U1
, so encoding it requires no
knowledge, and we can use zero bits:
instance Encode'U1
where encode'U1
= []
In the case for :+:
, we produce False
or True
depending on whether
the constructor of the value provided is located on the left or on the right:
instance (Encode' f, Encode' g) => Encode' (f:+:
g) where encode' (L1
x) = False : encode' x encode' (R1
x) = True : encode' x
(Note that this encoding strategy may not be reliable across different
versions of GHC. Recall that the compiler is free to choose any nesting
of :+:
it chooses, so if GHC chooses (a
, then the
encoding for :+:
b) :+:
ca
would be [False, False]
, b
would be [False, True]
,
and c
would be [True]
. However, if GHC chooses a
,
then the encoding for :+:
(b :+:
c)a
would be [False]
, b
would be [True, False]
,
and c
would be [True, True]
.)
In the case for :*:
, we append the encodings of the two subcomponents:
instance (Encode' f, Encode' g) => Encode' (f:*:
g) where encode' (x:*:
y) = encode' x ++ encode' y
The case for K1
is rather interesting. Here, we call the final function
encode
that we yet have to define, recursively. We will use another type
class Encode
for that function:
instance (Encode c) => Encode' (K1
i c) where encode' (K1
x) = encode x
Note how Par0
and Rec0
both being mapped to K1
allows us to define
a uniform instance here.
Similarly, we can define a uniform instance for M1
, because we completely
disregard all meta-information:
instance (Encode' f) => Encode' (M1
i t f) where encode' (M1
x) = encode' x
Unlike in K1
, the instance for M1
refers to encode'
, not encode
.
The wrapper and generic default
We now define class Encode
for the actual encode
function:
class Encode a where
encode :: a -> [Bool]
default encode :: (Generic a, Encode' (Rep a)) => a -> [Bool]
encode x = encode' (from
x)
The incoming x
is converted using from
, then we dispatch to the
generic instances using encode'
. We use this as a default definition
for encode
. We need the 'default encode' signature because ordinary
Haskell default methods must not introduce additional class constraints,
but our generic default does.
Defining a particular instance is now as simple as saying
instance (Encode a) => Encode (Tree a)
Omitting generic instances
It is not always required to provide instances for all the generic representation types, but omitting instances restricts the set of datatypes the functions will work for:
- If no
:+:
instance is given, the function may still work for empty datatypes or datatypes that have a single constructor, but will fail on datatypes with more than one constructor. - If no
:*:
instance is given, the function may still work for datatypes where each constructor has just zero or one field, in particular for enumeration types. - If no
K1
instance is given, the function may still work for enumeration types, where no constructor has any fields. - If no
V1
instance is given, the function may still work for any datatype that is not empty. - If no
U1
instance is given, the function may still work for any datatype where each constructor has at least one field.
An M1
instance is always required (but it can just ignore the
meta-information, as is the case for encode
above).
Generic constructor classes
Datatype-generic functions as defined above work for a large class
of datatypes, including parameterized datatypes. (We have used Tree
as our example above, which is of kind * -> *
.) However, the
Generic
class ranges over types of kind *
, and therefore, the
resulting generic functions (such as encode
) must be parameterized
by a generic type argument of kind *
.
What if we want to define generic classes that range over type
constructors (such as Functor
, Traversable
, or Foldable
)?
The
Generic1
class
Like Generic
, there is a class Generic1
that defines a
representation Rep1
and conversion functions from1
and to1
,
only that Generic1
ranges over types of kind * -> *
. (More generally,
it can range over types of kind k -> *
, for any kind k
, if the
PolyKinds
extension is enabled. More on this later.)
The Generic1
class is also derivable.
The representation Rep1
is ever so slightly different from Rep
.
Let us look at Tree
as an example again:
data Tree a = Leaf a | Node (Tree a) (Tree a)
deriving Generic1
The above declaration causes the following representation to be generated:
instanceGeneric1
Tree where typeRep1
Tree =D1
('MetaData "Tree" "Main" "package-name" 'False) (C1
('MetaCons "Leaf" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy)Par1
):+:
C1
('MetaCons "Node" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec1
Tree):*:
S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec1
Tree))) ...
The representation reuses D1
, C1
, S1
(and thereby M1
) as well
as :+:
and :*:
from Rep
. (This reusability is the reason that we
carry around the dummy type argument for kind-*
-types, but there are
already enough different names involved without duplicating each of
these.)
What's different is that we now use Par1
to refer to the parameter
(and that parameter, which used to be a
), is not mentioned explicitly
by name anywhere; and we use Rec1
to refer to a recursive use of Tree a
.
Representation of * -> *
types
Unlike Rec0
, the Par1
and Rec1
type constructors do not
map to K1
. They are defined directly, as follows:
newtypePar1
p =Par1
{unPar1
:: p } -- gives access to parameter p newtypeRec1
f p =Rec1
{unRec1
:: f p } -- a wrapper
In Par1
, the parameter p
is used for the first time, whereas Rec1
simply
wraps an application of f
to p
.
Note that K1
(in the guise of Rec0
) can still occur in a Rep1
representation,
namely when the datatype has a field that does not mention the parameter.
The declaration
data WithInt a = WithInt Int a
deriving Generic1
yields
instanceGeneric1
WithInt where typeRep1
WithInt =D1
('MetaData "WithInt" "Main" "package-name" 'False) (C1
('MetaCons "WithInt" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0
Int):*:
S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy)Par1
))
If the parameter a
appears underneath a composition of other type constructors,
then the representation involves composition, too:
data Rose a = Fork a [Rose a]
yields
instanceGeneric1
Rose where typeRep1
Rose =D1
('MetaData "Rose" "Main" "package-name" 'False) (C1
('MetaCons "Fork" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy)Par1
:*:
S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) ([]:.:
Rec1
Rose)))
where
newtype (:.:
) f g p =Comp1
{unComp1
:: f (g p) }
Representation of k -> *
types
The Generic1
class can be generalized to range over types of kind
k -> *
, for any kind k
. To do so, derive a Generic1
instance with the
PolyKinds
extension enabled. For example, the declaration
data Proxy (a :: k) = Proxy deriving Generic1
yields a slightly different instance depending on whether PolyKinds
is
enabled. If compiled without PolyKinds
, then
, but
if compiled with Rep1
Proxy :: * -> *PolyKinds
, then
.Rep1
Proxy :: k -> *
Representation of unlifted types
If one were to attempt to derive a Generic instance for a datatype with an
unlifted argument (for example, Int#
), one might expect the occurrence of
the Int#
argument to be marked with
. This won't work,
though, since Rec0
Int#
Int#
is of an unlifted kind, and Rec0
expects a type of
kind *
.
One solution would be to represent an occurrence of Int#
with 'Rec0 Int'
instead. With this approach, however, the programmer has no way of knowing
whether the Int
is actually an Int#
in disguise.
Instead of reusing Rec0
, a separate data family URec
is used to mark
occurrences of common unlifted types:
data family URec a p data instanceURec
(Ptr
()) p =UAddr
{uAddr#
::Addr#
} data instanceURec
Char
p =UChar
{uChar#
::Char#
} data instanceURec
Double
p =UDouble
{uDouble#
::Double#
} data instanceURec
Int
p =UFloat
{uFloat#
::Float#
} data instanceURec
Float
p =UInt
{uInt#
::Int#
} data instanceURec
Word
p =UWord
{uWord#
::Word#
}
Several type synonyms are provided for convenience:
typeUAddr
=URec
(Ptr
()) typeUChar
=URec
Char
typeUDouble
=URec
Double
typeUFloat
=URec
Float
typeUInt
=URec
Int
typeUWord
=URec
Word
The declaration
data IntHash = IntHash Int#
deriving Generic
yields
instanceGeneric
IntHash where typeRep
IntHash =D1
('MetaData "IntHash" "Main" "package-name" 'False) (C1
('MetaCons "IntHash" 'PrefixI 'False) (S1
('MetaSel 'Nothing 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy)UInt
))
Currently, only the six unlifted types listed above are generated, but this may be extended to encompass more unlifted types in the future.
Generic representation types
Void: used for datatypes without constructors
Instances
Generic1 (V1 :: k -> Type) Source # | |
Functor (V1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Foldable (V1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => V1 m -> m Source # foldMap :: Monoid m => (a -> m) -> V1 a -> m Source # foldr :: (a -> b -> b) -> b -> V1 a -> b Source # foldr' :: (a -> b -> b) -> b -> V1 a -> b Source # foldl :: (b -> a -> b) -> b -> V1 a -> b Source # foldl' :: (b -> a -> b) -> b -> V1 a -> b Source # foldr1 :: (a -> a -> a) -> V1 a -> a Source # foldl1 :: (a -> a -> a) -> V1 a -> a Source # toList :: V1 a -> [a] Source # length :: V1 a -> Int Source # elem :: Eq a => a -> V1 a -> Bool Source # maximum :: Ord a => V1 a -> a Source # minimum :: Ord a => V1 a -> a Source # | |
Traversable (V1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Contravariant (V1 :: Type -> Type) Source # | |
Eq (V1 p) Source # | Since: 4.9.0.0 |
Data p => Data (V1 p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> V1 p -> c (V1 p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (V1 p) Source # toConstr :: V1 p -> Constr Source # dataTypeOf :: V1 p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (V1 p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (V1 p)) Source # gmapT :: (forall b. Data b => b -> b) -> V1 p -> V1 p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> V1 p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> V1 p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> V1 p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> V1 p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> V1 p -> m (V1 p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> V1 p -> m (V1 p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> V1 p -> m (V1 p) Source # | |
Ord (V1 p) Source # | Since: 4.9.0.0 |
Read (V1 p) Source # | Since: 4.9.0.0 |
Show (V1 p) Source # | Since: 4.9.0.0 |
Generic (V1 p) Source # | |
Semigroup (V1 p) Source # | Since: 4.12.0.0 |
type Rep1 (V1 :: k -> Type) Source # | Since: 4.9.0.0 |
type Rep (V1 p) Source # | Since: 4.9.0.0 |
Unit: used for constructors without arguments
Instances
Generic1 (U1 :: k -> Type) Source # | |
Monad (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Functor (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Applicative (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Foldable (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => U1 m -> m Source # foldMap :: Monoid m => (a -> m) -> U1 a -> m Source # foldr :: (a -> b -> b) -> b -> U1 a -> b Source # foldr' :: (a -> b -> b) -> b -> U1 a -> b Source # foldl :: (b -> a -> b) -> b -> U1 a -> b Source # foldl' :: (b -> a -> b) -> b -> U1 a -> b Source # foldr1 :: (a -> a -> a) -> U1 a -> a Source # foldl1 :: (a -> a -> a) -> U1 a -> a Source # toList :: U1 a -> [a] Source # length :: U1 a -> Int Source # elem :: Eq a => a -> U1 a -> Bool Source # maximum :: Ord a => U1 a -> a Source # minimum :: Ord a => U1 a -> a Source # | |
Traversable (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
MonadPlus (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Alternative (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
MonadZip (U1 :: Type -> Type) Source # | Since: 4.9.0.0 |
Contravariant (U1 :: Type -> Type) Source # | |
Eq (U1 p) Source # | Since: 4.9.0.0 |
Data p => Data (U1 p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> U1 p -> c (U1 p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (U1 p) Source # toConstr :: U1 p -> Constr Source # dataTypeOf :: U1 p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (U1 p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (U1 p)) Source # gmapT :: (forall b. Data b => b -> b) -> U1 p -> U1 p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> U1 p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> U1 p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> U1 p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> U1 p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> U1 p -> m (U1 p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> U1 p -> m (U1 p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> U1 p -> m (U1 p) Source # | |
Ord (U1 p) Source # | Since: 4.7.0.0 |
Read (U1 p) Source # | Since: 4.9.0.0 |
Show (U1 p) Source # | Since: 4.9.0.0 |
Generic (U1 p) Source # | |
Semigroup (U1 p) Source # | Since: 4.12.0.0 |
Monoid (U1 p) Source # | Since: 4.12.0.0 |
type Rep1 (U1 :: k -> Type) Source # | Since: 4.9.0.0 |
type Rep (U1 p) Source # | Since: 4.7.0.0 |
Used for marking occurrences of the parameter
Instances
Monad Par1 Source # | Since: 4.9.0.0 |
Functor Par1 Source # | Since: 4.9.0.0 |
MonadFix Par1 Source # | Since: 4.9.0.0 |
Applicative Par1 Source # | Since: 4.9.0.0 |
Foldable Par1 Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => Par1 m -> m Source # foldMap :: Monoid m => (a -> m) -> Par1 a -> m Source # foldr :: (a -> b -> b) -> b -> Par1 a -> b Source # foldr' :: (a -> b -> b) -> b -> Par1 a -> b Source # foldl :: (b -> a -> b) -> b -> Par1 a -> b Source # foldl' :: (b -> a -> b) -> b -> Par1 a -> b Source # foldr1 :: (a -> a -> a) -> Par1 a -> a Source # foldl1 :: (a -> a -> a) -> Par1 a -> a Source # toList :: Par1 a -> [a] Source # null :: Par1 a -> Bool Source # length :: Par1 a -> Int Source # elem :: Eq a => a -> Par1 a -> Bool Source # maximum :: Ord a => Par1 a -> a Source # minimum :: Ord a => Par1 a -> a Source # | |
Traversable Par1 Source # | Since: 4.9.0.0 |
MonadZip Par1 Source # | Since: 4.9.0.0 |
Eq p => Eq (Par1 p) Source # | Since: 4.7.0.0 |
Data p => Data (Par1 p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Par1 p -> c (Par1 p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Par1 p) Source # toConstr :: Par1 p -> Constr Source # dataTypeOf :: Par1 p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Par1 p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Par1 p)) Source # gmapT :: (forall b. Data b => b -> b) -> Par1 p -> Par1 p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Par1 p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Par1 p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> Par1 p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> Par1 p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Par1 p -> m (Par1 p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Par1 p -> m (Par1 p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Par1 p -> m (Par1 p) Source # | |
Ord p => Ord (Par1 p) Source # | Since: 4.7.0.0 |
Read p => Read (Par1 p) Source # | Since: 4.7.0.0 |
Show p => Show (Par1 p) Source # | Since: 4.7.0.0 |
Generic (Par1 p) Source # | |
Semigroup p => Semigroup (Par1 p) Source # | Since: 4.12.0.0 |
Monoid p => Monoid (Par1 p) Source # | Since: 4.12.0.0 |
Generic1 Par1 Source # | |
type Rep (Par1 p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics | |
type Rep1 Par1 Source # | Since: 4.9.0.0 |
Defined in GHC.Generics |
newtype Rec1 (f :: k -> Type) (p :: k) Source #
Recursive calls of kind * -> *
(or kind k -> *
, when PolyKinds
is enabled)
Instances
Generic1 (Rec1 f :: k -> Type) Source # | |
Monad f => Monad (Rec1 f) Source # | Since: 4.9.0.0 |
Functor f => Functor (Rec1 f) Source # | Since: 4.9.0.0 |
MonadFix f => MonadFix (Rec1 f) Source # | Since: 4.9.0.0 |
Applicative f => Applicative (Rec1 f) Source # | Since: 4.9.0.0 |
Foldable f => Foldable (Rec1 f) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => Rec1 f m -> m Source # foldMap :: Monoid m => (a -> m) -> Rec1 f a -> m Source # foldr :: (a -> b -> b) -> b -> Rec1 f a -> b Source # foldr' :: (a -> b -> b) -> b -> Rec1 f a -> b Source # foldl :: (b -> a -> b) -> b -> Rec1 f a -> b Source # foldl' :: (b -> a -> b) -> b -> Rec1 f a -> b Source # foldr1 :: (a -> a -> a) -> Rec1 f a -> a Source # foldl1 :: (a -> a -> a) -> Rec1 f a -> a Source # toList :: Rec1 f a -> [a] Source # null :: Rec1 f a -> Bool Source # length :: Rec1 f a -> Int Source # elem :: Eq a => a -> Rec1 f a -> Bool Source # maximum :: Ord a => Rec1 f a -> a Source # minimum :: Ord a => Rec1 f a -> a Source # | |
Traversable f => Traversable (Rec1 f) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
MonadPlus f => MonadPlus (Rec1 f) Source # | Since: 4.9.0.0 |
Alternative f => Alternative (Rec1 f) Source # | Since: 4.9.0.0 |
MonadZip f => MonadZip (Rec1 f) Source # | Since: 4.9.0.0 |
Contravariant f => Contravariant (Rec1 f) Source # | |
Eq (f p) => Eq (Rec1 f p) Source # | Since: 4.7.0.0 |
(Data (f p), Typeable f, Data p) => Data (Rec1 f p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Rec1 f p -> c (Rec1 f p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Rec1 f p) Source # toConstr :: Rec1 f p -> Constr Source # dataTypeOf :: Rec1 f p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Rec1 f p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Rec1 f p)) Source # gmapT :: (forall b. Data b => b -> b) -> Rec1 f p -> Rec1 f p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Rec1 f p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Rec1 f p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> Rec1 f p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> Rec1 f p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Rec1 f p -> m (Rec1 f p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Rec1 f p -> m (Rec1 f p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Rec1 f p -> m (Rec1 f p) Source # | |
Ord (f p) => Ord (Rec1 f p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics | |
Read (f p) => Read (Rec1 f p) Source # | Since: 4.7.0.0 |
Show (f p) => Show (Rec1 f p) Source # | Since: 4.7.0.0 |
Generic (Rec1 f p) Source # | |
Semigroup (f p) => Semigroup (Rec1 f p) Source # | Since: 4.12.0.0 |
Monoid (f p) => Monoid (Rec1 f p) Source # | Since: 4.12.0.0 |
type Rep1 (Rec1 f :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (Rec1 f p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics |
newtype K1 (i :: Type) c (p :: k) Source #
Constants, additional parameters and recursion of kind *
Instances
Generic1 (K1 i c :: k -> Type) Source # | |
Bifunctor (K1 i :: Type -> Type -> Type) Source # | Since: 4.9.0.0 |
Bifoldable (K1 i :: Type -> Type -> Type) Source # | Since: 4.10.0.0 |
Bitraversable (K1 i :: Type -> Type -> Type) Source # | Since: 4.10.0.0 |
Defined in Data.Bitraversable bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> K1 i a b -> f (K1 i c d) Source # | |
Functor (K1 i c :: Type -> Type) Source # | Since: 4.9.0.0 |
Monoid c => Applicative (K1 i c :: Type -> Type) Source # | Since: 4.12.0.0 |
Foldable (K1 i c :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => K1 i c m -> m Source # foldMap :: Monoid m => (a -> m) -> K1 i c a -> m Source # foldr :: (a -> b -> b) -> b -> K1 i c a -> b Source # foldr' :: (a -> b -> b) -> b -> K1 i c a -> b Source # foldl :: (b -> a -> b) -> b -> K1 i c a -> b Source # foldl' :: (b -> a -> b) -> b -> K1 i c a -> b Source # foldr1 :: (a -> a -> a) -> K1 i c a -> a Source # foldl1 :: (a -> a -> a) -> K1 i c a -> a Source # toList :: K1 i c a -> [a] Source # null :: K1 i c a -> Bool Source # length :: K1 i c a -> Int Source # elem :: Eq a => a -> K1 i c a -> Bool Source # maximum :: Ord a => K1 i c a -> a Source # minimum :: Ord a => K1 i c a -> a Source # | |
Traversable (K1 i c :: Type -> Type) Source # | Since: 4.9.0.0 |
Contravariant (K1 i c :: Type -> Type) Source # | |
Eq c => Eq (K1 i c p) Source # | Since: 4.7.0.0 |
(Typeable i, Data p, Data c) => Data (K1 i c p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c0 (d -> b) -> d -> c0 b) -> (forall g. g -> c0 g) -> K1 i c p -> c0 (K1 i c p) Source # gunfold :: (forall b r. Data b => c0 (b -> r) -> c0 r) -> (forall r. r -> c0 r) -> Constr -> c0 (K1 i c p) Source # toConstr :: K1 i c p -> Constr Source # dataTypeOf :: K1 i c p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c0 (t d)) -> Maybe (c0 (K1 i c p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c0 (t d e)) -> Maybe (c0 (K1 i c p)) Source # gmapT :: (forall b. Data b => b -> b) -> K1 i c p -> K1 i c p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> K1 i c p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> K1 i c p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> K1 i c p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> K1 i c p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> K1 i c p -> m (K1 i c p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> K1 i c p -> m (K1 i c p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> K1 i c p -> m (K1 i c p) Source # | |
Ord c => Ord (K1 i c p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics | |
Read c => Read (K1 i c p) Source # | Since: 4.7.0.0 |
Show c => Show (K1 i c p) Source # | Since: 4.7.0.0 |
Generic (K1 i c p) Source # | |
Semigroup c => Semigroup (K1 i c p) Source # | Since: 4.12.0.0 |
Monoid c => Monoid (K1 i c p) Source # | Since: 4.12.0.0 |
type Rep1 (K1 i c :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (K1 i c p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics |
newtype M1 (i :: Type) (c :: Meta) (f :: k -> Type) (p :: k) Source #
Meta-information (constructor names, etc.)
Instances
Generic1 (M1 i c f :: k -> Type) Source # | |
Monad f => Monad (M1 i c f) Source # | Since: 4.9.0.0 |
Functor f => Functor (M1 i c f) Source # | Since: 4.9.0.0 |
MonadFix f => MonadFix (M1 i c f) Source # | Since: 4.9.0.0 |
Applicative f => Applicative (M1 i c f) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
Foldable f => Foldable (M1 i c f) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => M1 i c f m -> m Source # foldMap :: Monoid m => (a -> m) -> M1 i c f a -> m Source # foldr :: (a -> b -> b) -> b -> M1 i c f a -> b Source # foldr' :: (a -> b -> b) -> b -> M1 i c f a -> b Source # foldl :: (b -> a -> b) -> b -> M1 i c f a -> b Source # foldl' :: (b -> a -> b) -> b -> M1 i c f a -> b Source # foldr1 :: (a -> a -> a) -> M1 i c f a -> a Source # foldl1 :: (a -> a -> a) -> M1 i c f a -> a Source # toList :: M1 i c f a -> [a] Source # null :: M1 i c f a -> Bool Source # length :: M1 i c f a -> Int Source # elem :: Eq a => a -> M1 i c f a -> Bool Source # maximum :: Ord a => M1 i c f a -> a Source # minimum :: Ord a => M1 i c f a -> a Source # | |
Traversable f => Traversable (M1 i c f) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
MonadPlus f => MonadPlus (M1 i c f) Source # | Since: 4.9.0.0 |
Alternative f => Alternative (M1 i c f) Source # | Since: 4.9.0.0 |
MonadZip f => MonadZip (M1 i c f) Source # | Since: 4.9.0.0 |
Contravariant f => Contravariant (M1 i c f) Source # | |
Eq (f p) => Eq (M1 i c f p) Source # | Since: 4.7.0.0 |
(Data p, Data (f p), Typeable c, Typeable i, Typeable f) => Data (M1 i c f p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c0 (d -> b) -> d -> c0 b) -> (forall g. g -> c0 g) -> M1 i c f p -> c0 (M1 i c f p) Source # gunfold :: (forall b r. Data b => c0 (b -> r) -> c0 r) -> (forall r. r -> c0 r) -> Constr -> c0 (M1 i c f p) Source # toConstr :: M1 i c f p -> Constr Source # dataTypeOf :: M1 i c f p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c0 (t d)) -> Maybe (c0 (M1 i c f p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c0 (t d e)) -> Maybe (c0 (M1 i c f p)) Source # gmapT :: (forall b. Data b => b -> b) -> M1 i c f p -> M1 i c f p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> M1 i c f p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> M1 i c f p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> M1 i c f p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> M1 i c f p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> M1 i c f p -> m (M1 i c f p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> M1 i c f p -> m (M1 i c f p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> M1 i c f p -> m (M1 i c f p) Source # | |
Ord (f p) => Ord (M1 i c f p) Source # | Since: 4.7.0.0 |
Read (f p) => Read (M1 i c f p) Source # | Since: 4.7.0.0 |
Show (f p) => Show (M1 i c f p) Source # | Since: 4.7.0.0 |
Generic (M1 i c f p) Source # | |
Semigroup (f p) => Semigroup (M1 i c f p) Source # | Since: 4.12.0.0 |
Monoid (f p) => Monoid (M1 i c f p) Source # | Since: 4.12.0.0 |
type Rep1 (M1 i c f :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (M1 i c f p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics |
data ((f :: k -> Type) :+: (g :: k -> Type)) (p :: k) infixr 5 Source #
Sums: encode choice between constructors
Instances
Generic1 (f :+: g :: k -> Type) Source # | |
(Functor f, Functor g) => Functor (f :+: g) Source # | Since: 4.9.0.0 |
(Foldable f, Foldable g) => Foldable (f :+: g) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => (f :+: g) m -> m Source # foldMap :: Monoid m => (a -> m) -> (f :+: g) a -> m Source # foldr :: (a -> b -> b) -> b -> (f :+: g) a -> b Source # foldr' :: (a -> b -> b) -> b -> (f :+: g) a -> b Source # foldl :: (b -> a -> b) -> b -> (f :+: g) a -> b Source # foldl' :: (b -> a -> b) -> b -> (f :+: g) a -> b Source # foldr1 :: (a -> a -> a) -> (f :+: g) a -> a Source # foldl1 :: (a -> a -> a) -> (f :+: g) a -> a Source # toList :: (f :+: g) a -> [a] Source # null :: (f :+: g) a -> Bool Source # length :: (f :+: g) a -> Int Source # elem :: Eq a => a -> (f :+: g) a -> Bool Source # maximum :: Ord a => (f :+: g) a -> a Source # minimum :: Ord a => (f :+: g) a -> a Source # | |
(Traversable f, Traversable g) => Traversable (f :+: g) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
(Contravariant f, Contravariant g) => Contravariant (f :+: g) Source # | |
(Eq (f p), Eq (g p)) => Eq ((f :+: g) p) Source # | Since: 4.7.0.0 |
(Typeable f, Typeable g, Data p, Data (f p), Data (g p)) => Data ((f :+: g) p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g0. g0 -> c g0) -> (f :+: g) p -> c ((f :+: g) p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ((f :+: g) p) Source # toConstr :: (f :+: g) p -> Constr Source # dataTypeOf :: (f :+: g) p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c ((f :+: g) p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ((f :+: g) p)) Source # gmapT :: (forall b. Data b => b -> b) -> (f :+: g) p -> (f :+: g) p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> (f :+: g) p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> (f :+: g) p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> (f :+: g) p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> (f :+: g) p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> (f :+: g) p -> m ((f :+: g) p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> (f :+: g) p -> m ((f :+: g) p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> (f :+: g) p -> m ((f :+: g) p) Source # | |
(Ord (f p), Ord (g p)) => Ord ((f :+: g) p) Source # | Since: 4.7.0.0 |
(Read (f p), Read (g p)) => Read ((f :+: g) p) Source # | Since: 4.7.0.0 |
(Show (f p), Show (g p)) => Show ((f :+: g) p) Source # | Since: 4.7.0.0 |
Generic ((f :+: g) p) Source # | |
type Rep1 (f :+: g :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics type Rep1 (f :+: g :: k -> Type) = D1 (MetaData ":+:" "GHC.Generics" "base" False) (C1 (MetaCons "L1" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec1 f)) :+: C1 (MetaCons "R1" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec1 g))) | |
type Rep ((f :+: g) p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics type Rep ((f :+: g) p) = D1 (MetaData ":+:" "GHC.Generics" "base" False) (C1 (MetaCons "L1" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (f p))) :+: C1 (MetaCons "R1" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (g p)))) |
data ((f :: k -> Type) :*: (g :: k -> Type)) (p :: k) infixr 6 Source #
Products: encode multiple arguments to constructors
(f p) :*: (g p) infixr 6 |
Instances
Generic1 (f :*: g :: k -> Type) Source # | |
(Monad f, Monad g) => Monad (f :*: g) Source # | Since: 4.9.0.0 |
(Functor f, Functor g) => Functor (f :*: g) Source # | Since: 4.9.0.0 |
(MonadFix f, MonadFix g) => MonadFix (f :*: g) Source # | Since: 4.9.0.0 |
(Applicative f, Applicative g) => Applicative (f :*: g) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
(Foldable f, Foldable g) => Foldable (f :*: g) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => (f :*: g) m -> m Source # foldMap :: Monoid m => (a -> m) -> (f :*: g) a -> m Source # foldr :: (a -> b -> b) -> b -> (f :*: g) a -> b Source # foldr' :: (a -> b -> b) -> b -> (f :*: g) a -> b Source # foldl :: (b -> a -> b) -> b -> (f :*: g) a -> b Source # foldl' :: (b -> a -> b) -> b -> (f :*: g) a -> b Source # foldr1 :: (a -> a -> a) -> (f :*: g) a -> a Source # foldl1 :: (a -> a -> a) -> (f :*: g) a -> a Source # toList :: (f :*: g) a -> [a] Source # null :: (f :*: g) a -> Bool Source # length :: (f :*: g) a -> Int Source # elem :: Eq a => a -> (f :*: g) a -> Bool Source # maximum :: Ord a => (f :*: g) a -> a Source # minimum :: Ord a => (f :*: g) a -> a Source # | |
(Traversable f, Traversable g) => Traversable (f :*: g) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
(MonadPlus f, MonadPlus g) => MonadPlus (f :*: g) Source # | Since: 4.9.0.0 |
(Alternative f, Alternative g) => Alternative (f :*: g) Source # | Since: 4.9.0.0 |
(MonadZip f, MonadZip g) => MonadZip (f :*: g) Source # | Since: 4.9.0.0 |
(Contravariant f, Contravariant g) => Contravariant (f :*: g) Source # | |
(Eq (f p), Eq (g p)) => Eq ((f :*: g) p) Source # | Since: 4.7.0.0 |
(Typeable f, Typeable g, Data p, Data (f p), Data (g p)) => Data ((f :*: g) p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g0. g0 -> c g0) -> (f :*: g) p -> c ((f :*: g) p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ((f :*: g) p) Source # toConstr :: (f :*: g) p -> Constr Source # dataTypeOf :: (f :*: g) p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c ((f :*: g) p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ((f :*: g) p)) Source # gmapT :: (forall b. Data b => b -> b) -> (f :*: g) p -> (f :*: g) p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> (f :*: g) p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> (f :*: g) p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> (f :*: g) p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> (f :*: g) p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> (f :*: g) p -> m ((f :*: g) p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> (f :*: g) p -> m ((f :*: g) p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> (f :*: g) p -> m ((f :*: g) p) Source # | |
(Ord (f p), Ord (g p)) => Ord ((f :*: g) p) Source # | Since: 4.7.0.0 |
(Read (f p), Read (g p)) => Read ((f :*: g) p) Source # | Since: 4.7.0.0 |
(Show (f p), Show (g p)) => Show ((f :*: g) p) Source # | Since: 4.7.0.0 |
Generic ((f :*: g) p) Source # | |
(Semigroup (f p), Semigroup (g p)) => Semigroup ((f :*: g) p) Source # | Since: 4.12.0.0 |
(Monoid (f p), Monoid (g p)) => Monoid ((f :*: g) p) Source # | Since: 4.12.0.0 |
type Rep1 (f :*: g :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics type Rep1 (f :*: g :: k -> Type) = D1 (MetaData ":*:" "GHC.Generics" "base" False) (C1 (MetaCons ":*:" (InfixI RightAssociative 6) False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec1 f) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec1 g))) | |
type Rep ((f :*: g) p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics type Rep ((f :*: g) p) = D1 (MetaData ":*:" "GHC.Generics" "base" False) (C1 (MetaCons ":*:" (InfixI RightAssociative 6) False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (f p)) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (g p)))) |
newtype ((f :: k2 -> Type) :.: (g :: k1 -> k2)) (p :: k1) infixr 7 Source #
Composition of functors
Instances
Functor f => Generic1 (f :.: g :: k -> Type) Source # | |
(Functor f, Functor g) => Functor (f :.: g) Source # | Since: 4.9.0.0 |
(Applicative f, Applicative g) => Applicative (f :.: g) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
(Foldable f, Foldable g) => Foldable (f :.: g) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => (f :.: g) m -> m Source # foldMap :: Monoid m => (a -> m) -> (f :.: g) a -> m Source # foldr :: (a -> b -> b) -> b -> (f :.: g) a -> b Source # foldr' :: (a -> b -> b) -> b -> (f :.: g) a -> b Source # foldl :: (b -> a -> b) -> b -> (f :.: g) a -> b Source # foldl' :: (b -> a -> b) -> b -> (f :.: g) a -> b Source # foldr1 :: (a -> a -> a) -> (f :.: g) a -> a Source # foldl1 :: (a -> a -> a) -> (f :.: g) a -> a Source # toList :: (f :.: g) a -> [a] Source # null :: (f :.: g) a -> Bool Source # length :: (f :.: g) a -> Int Source # elem :: Eq a => a -> (f :.: g) a -> Bool Source # maximum :: Ord a => (f :.: g) a -> a Source # minimum :: Ord a => (f :.: g) a -> a Source # | |
(Traversable f, Traversable g) => Traversable (f :.: g) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
(Alternative f, Applicative g) => Alternative (f :.: g) Source # | Since: 4.9.0.0 |
(Functor f, Contravariant g) => Contravariant (f :.: g) Source # | |
Eq (f (g p)) => Eq ((f :.: g) p) Source # | Since: 4.7.0.0 |
(Typeable f, Typeable g, Data p, Data (f (g p))) => Data ((f :.: g) p) Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g0. g0 -> c g0) -> (f :.: g) p -> c ((f :.: g) p) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ((f :.: g) p) Source # toConstr :: (f :.: g) p -> Constr Source # dataTypeOf :: (f :.: g) p -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c ((f :.: g) p)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ((f :.: g) p)) Source # gmapT :: (forall b. Data b => b -> b) -> (f :.: g) p -> (f :.: g) p Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> (f :.: g) p -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> (f :.: g) p -> r Source # gmapQ :: (forall d. Data d => d -> u) -> (f :.: g) p -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> (f :.: g) p -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> (f :.: g) p -> m ((f :.: g) p) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> (f :.: g) p -> m ((f :.: g) p) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> (f :.: g) p -> m ((f :.: g) p) Source # | |
Ord (f (g p)) => Ord ((f :.: g) p) Source # | Since: 4.7.0.0 |
Read (f (g p)) => Read ((f :.: g) p) Source # | Since: 4.7.0.0 |
Show (f (g p)) => Show ((f :.: g) p) Source # | Since: 4.7.0.0 |
Generic ((f :.: g) p) Source # | |
Semigroup (f (g p)) => Semigroup ((f :.: g) p) Source # | Since: 4.12.0.0 |
Monoid (f (g p)) => Monoid ((f :.: g) p) Source # | Since: 4.12.0.0 |
type Rep1 (f :.: g :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep ((f :.: g) p) Source # | Since: 4.7.0.0 |
Defined in GHC.Generics |
Unboxed representation types
data family URec (a :: Type) (p :: k) Source #
Constants of unlifted kinds
Since: 4.9.0.0
Instances
Generic1 (URec Word :: k -> Type) Source # | |
Generic1 (URec Int :: k -> Type) Source # | |
Generic1 (URec Float :: k -> Type) Source # | |
Generic1 (URec Double :: k -> Type) Source # | |
Generic1 (URec Char :: k -> Type) Source # | |
Generic1 (URec (Ptr ()) :: k -> Type) Source # | |
Functor (URec Char :: Type -> Type) Source # | Since: 4.9.0.0 |
Functor (URec Double :: Type -> Type) Source # | Since: 4.9.0.0 |
Functor (URec Float :: Type -> Type) Source # | Since: 4.9.0.0 |
Functor (URec Int :: Type -> Type) Source # | Since: 4.9.0.0 |
Functor (URec Word :: Type -> Type) Source # | Since: 4.9.0.0 |
Functor (URec (Ptr ()) :: Type -> Type) Source # | Since: 4.9.0.0 |
Foldable (URec Char :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => URec Char m -> m Source # foldMap :: Monoid m => (a -> m) -> URec Char a -> m Source # foldr :: (a -> b -> b) -> b -> URec Char a -> b Source # foldr' :: (a -> b -> b) -> b -> URec Char a -> b Source # foldl :: (b -> a -> b) -> b -> URec Char a -> b Source # foldl' :: (b -> a -> b) -> b -> URec Char a -> b Source # foldr1 :: (a -> a -> a) -> URec Char a -> a Source # foldl1 :: (a -> a -> a) -> URec Char a -> a Source # toList :: URec Char a -> [a] Source # null :: URec Char a -> Bool Source # length :: URec Char a -> Int Source # elem :: Eq a => a -> URec Char a -> Bool Source # maximum :: Ord a => URec Char a -> a Source # minimum :: Ord a => URec Char a -> a Source # | |
Foldable (URec Double :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => URec Double m -> m Source # foldMap :: Monoid m => (a -> m) -> URec Double a -> m Source # foldr :: (a -> b -> b) -> b -> URec Double a -> b Source # foldr' :: (a -> b -> b) -> b -> URec Double a -> b Source # foldl :: (b -> a -> b) -> b -> URec Double a -> b Source # foldl' :: (b -> a -> b) -> b -> URec Double a -> b Source # foldr1 :: (a -> a -> a) -> URec Double a -> a Source # foldl1 :: (a -> a -> a) -> URec Double a -> a Source # toList :: URec Double a -> [a] Source # null :: URec Double a -> Bool Source # length :: URec Double a -> Int Source # elem :: Eq a => a -> URec Double a -> Bool Source # maximum :: Ord a => URec Double a -> a Source # minimum :: Ord a => URec Double a -> a Source # | |
Foldable (URec Float :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => URec Float m -> m Source # foldMap :: Monoid m => (a -> m) -> URec Float a -> m Source # foldr :: (a -> b -> b) -> b -> URec Float a -> b Source # foldr' :: (a -> b -> b) -> b -> URec Float a -> b Source # foldl :: (b -> a -> b) -> b -> URec Float a -> b Source # foldl' :: (b -> a -> b) -> b -> URec Float a -> b Source # foldr1 :: (a -> a -> a) -> URec Float a -> a Source # foldl1 :: (a -> a -> a) -> URec Float a -> a Source # toList :: URec Float a -> [a] Source # null :: URec Float a -> Bool Source # length :: URec Float a -> Int Source # elem :: Eq a => a -> URec Float a -> Bool Source # maximum :: Ord a => URec Float a -> a Source # minimum :: Ord a => URec Float a -> a Source # | |
Foldable (URec Int :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => URec Int m -> m Source # foldMap :: Monoid m => (a -> m) -> URec Int a -> m Source # foldr :: (a -> b -> b) -> b -> URec Int a -> b Source # foldr' :: (a -> b -> b) -> b -> URec Int a -> b Source # foldl :: (b -> a -> b) -> b -> URec Int a -> b Source # foldl' :: (b -> a -> b) -> b -> URec Int a -> b Source # foldr1 :: (a -> a -> a) -> URec Int a -> a Source # foldl1 :: (a -> a -> a) -> URec Int a -> a Source # toList :: URec Int a -> [a] Source # null :: URec Int a -> Bool Source # length :: URec Int a -> Int Source # elem :: Eq a => a -> URec Int a -> Bool Source # maximum :: Ord a => URec Int a -> a Source # minimum :: Ord a => URec Int a -> a Source # | |
Foldable (URec Word :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => URec Word m -> m Source # foldMap :: Monoid m => (a -> m) -> URec Word a -> m Source # foldr :: (a -> b -> b) -> b -> URec Word a -> b Source # foldr' :: (a -> b -> b) -> b -> URec Word a -> b Source # foldl :: (b -> a -> b) -> b -> URec Word a -> b Source # foldl' :: (b -> a -> b) -> b -> URec Word a -> b Source # foldr1 :: (a -> a -> a) -> URec Word a -> a Source # foldl1 :: (a -> a -> a) -> URec Word a -> a Source # toList :: URec Word a -> [a] Source # null :: URec Word a -> Bool Source # length :: URec Word a -> Int Source # elem :: Eq a => a -> URec Word a -> Bool Source # maximum :: Ord a => URec Word a -> a Source # minimum :: Ord a => URec Word a -> a Source # | |
Foldable (URec (Ptr ()) :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Foldable fold :: Monoid m => URec (Ptr ()) m -> m Source # foldMap :: Monoid m => (a -> m) -> URec (Ptr ()) a -> m Source # foldr :: (a -> b -> b) -> b -> URec (Ptr ()) a -> b Source # foldr' :: (a -> b -> b) -> b -> URec (Ptr ()) a -> b Source # foldl :: (b -> a -> b) -> b -> URec (Ptr ()) a -> b Source # foldl' :: (b -> a -> b) -> b -> URec (Ptr ()) a -> b Source # foldr1 :: (a -> a -> a) -> URec (Ptr ()) a -> a Source # foldl1 :: (a -> a -> a) -> URec (Ptr ()) a -> a Source # toList :: URec (Ptr ()) a -> [a] Source # null :: URec (Ptr ()) a -> Bool Source # length :: URec (Ptr ()) a -> Int Source # elem :: Eq a => a -> URec (Ptr ()) a -> Bool Source # maximum :: Ord a => URec (Ptr ()) a -> a Source # minimum :: Ord a => URec (Ptr ()) a -> a Source # | |
Traversable (URec Char :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
Traversable (URec Double :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable traverse :: Applicative f => (a -> f b) -> URec Double a -> f (URec Double b) Source # sequenceA :: Applicative f => URec Double (f a) -> f (URec Double a) Source # mapM :: Monad m => (a -> m b) -> URec Double a -> m (URec Double b) Source # sequence :: Monad m => URec Double (m a) -> m (URec Double a) Source # | |
Traversable (URec Float :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable traverse :: Applicative f => (a -> f b) -> URec Float a -> f (URec Float b) Source # sequenceA :: Applicative f => URec Float (f a) -> f (URec Float a) Source # mapM :: Monad m => (a -> m b) -> URec Float a -> m (URec Float b) Source # sequence :: Monad m => URec Float (m a) -> m (URec Float a) Source # | |
Traversable (URec Int :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
Traversable (URec Word :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable | |
Traversable (URec (Ptr ()) :: Type -> Type) Source # | Since: 4.9.0.0 |
Defined in Data.Traversable traverse :: Applicative f => (a -> f b) -> URec (Ptr ()) a -> f (URec (Ptr ()) b) Source # sequenceA :: Applicative f => URec (Ptr ()) (f a) -> f (URec (Ptr ()) a) Source # mapM :: Monad m => (a -> m b) -> URec (Ptr ()) a -> m (URec (Ptr ()) b) Source # sequence :: Monad m => URec (Ptr ()) (m a) -> m (URec (Ptr ()) a) Source # | |
Eq (URec Word p) Source # | Since: 4.9.0.0 |
Eq (URec Int p) Source # | Since: 4.9.0.0 |
Eq (URec Float p) Source # | |
Eq (URec Double p) Source # | Since: 4.9.0.0 |
Eq (URec Char p) Source # | Since: 4.9.0.0 |
Eq (URec (Ptr ()) p) Source # | Since: 4.9.0.0 |
Ord (URec Word p) Source # | Since: 4.9.0.0 |
Ord (URec Int p) Source # | Since: 4.9.0.0 |
Ord (URec Float p) Source # | |
Defined in GHC.Generics | |
Ord (URec Double p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics compare :: URec Double p -> URec Double p -> Ordering # (<) :: URec Double p -> URec Double p -> Bool # (<=) :: URec Double p -> URec Double p -> Bool # (>) :: URec Double p -> URec Double p -> Bool # (>=) :: URec Double p -> URec Double p -> Bool # | |
Ord (URec Char p) Source # | Since: 4.9.0.0 |
Ord (URec (Ptr ()) p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics compare :: URec (Ptr ()) p -> URec (Ptr ()) p -> Ordering # (<) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (<=) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (>) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (>=) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # max :: URec (Ptr ()) p -> URec (Ptr ()) p -> URec (Ptr ()) p # min :: URec (Ptr ()) p -> URec (Ptr ()) p -> URec (Ptr ()) p # | |
Show (URec Word p) Source # | Since: 4.9.0.0 |
Show (URec Int p) Source # | Since: 4.9.0.0 |
Show (URec Float p) Source # | |
Show (URec Double p) Source # | Since: 4.9.0.0 |
Show (URec Char p) Source # | Since: 4.9.0.0 |
Generic (URec Word p) Source # | |
Generic (URec Int p) Source # | |
Generic (URec Float p) Source # | |
Generic (URec Double p) Source # | |
Generic (URec Char p) Source # | |
Generic (URec (Ptr ()) p) Source # | |
data URec Word (p :: k) Source # | Used for marking occurrences of Since: 4.9.0.0 |
data URec Int (p :: k) Source # | Used for marking occurrences of Since: 4.9.0.0 |
data URec Float (p :: k) Source # | Used for marking occurrences of Since: 4.9.0.0 |
data URec Double (p :: k) Source # | Used for marking occurrences of Since: 4.9.0.0 |
data URec Char (p :: k) Source # | Used for marking occurrences of Since: 4.9.0.0 |
data URec (Ptr ()) (p :: k) Source # | Used for marking occurrences of Since: 4.9.0.0 |
type Rep1 (URec Word :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep1 (URec Int :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep1 (URec Float :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep1 (URec Double :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep1 (URec Char :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep1 (URec (Ptr ()) :: k -> Type) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (URec Word p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (URec Int p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (URec Float p) Source # | |
Defined in GHC.Generics | |
type Rep (URec Double p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (URec Char p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics | |
type Rep (URec (Ptr ()) p) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics |
Synonyms for convenience
Meta-information
class Datatype d where Source #
Class for datatypes that represent datatypes
datatypeName :: t d (f :: k -> Type) (a :: k) -> [Char] Source #
The name of the datatype (unqualified)
moduleName :: t d (f :: k -> Type) (a :: k) -> [Char] Source #
The fully-qualified name of the module where the type is declared
packageName :: t d (f :: k -> Type) (a :: k) -> [Char] Source #
The package name of the module where the type is declared
Since: 4.9.0.0
isNewtype :: t d (f :: k -> Type) (a :: k) -> Bool Source #
Marks if the datatype is actually a newtype
Since: 4.7.0.0
Instances
(KnownSymbol n, KnownSymbol m, KnownSymbol p, SingI nt) => Datatype (MetaData n m p nt :: Meta) Source # | Since: 4.9.0.0 |
class Constructor c where Source #
Class for datatypes that represent data constructors
class Selector s where Source #
Class for datatypes that represent records
selName :: t s (f :: k -> Type) (a :: k) -> [Char] Source #
The name of the selector
selSourceUnpackedness :: t s (f :: k -> Type) (a :: k) -> SourceUnpackedness Source #
The selector's unpackedness annotation (if any)
Since: 4.9.0.0
selSourceStrictness :: t s (f :: k -> Type) (a :: k) -> SourceStrictness Source #
The selector's strictness annotation (if any)
Since: 4.9.0.0
selDecidedStrictness :: t s (f :: k -> Type) (a :: k) -> DecidedStrictness Source #
The strictness that the compiler inferred for the selector
Since: 4.9.0.0
Instances
(SingI mn, SingI su, SingI ss, SingI ds) => Selector (MetaSel mn su ss ds :: Meta) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics selName :: t (MetaSel mn su ss ds) f a -> [Char] Source # selSourceUnpackedness :: t (MetaSel mn su ss ds) f a -> SourceUnpackedness Source # selSourceStrictness :: t (MetaSel mn su ss ds) f a -> SourceStrictness Source # selDecidedStrictness :: t (MetaSel mn su ss ds) f a -> DecidedStrictness Source # |
Datatype to represent the fixity of a constructor. An infix
| declaration directly corresponds to an application of Infix
.
Instances
Eq Fixity Source # | Since: 4.6.0.0 |
Data Fixity Source # | Since: 4.9.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Fixity -> c Fixity Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Fixity Source # toConstr :: Fixity -> Constr Source # dataTypeOf :: Fixity -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Fixity) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Fixity) Source # gmapT :: (forall b. Data b => b -> b) -> Fixity -> Fixity Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Fixity -> r Source # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Fixity -> r Source # gmapQ :: (forall d. Data d => d -> u) -> Fixity -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> Fixity -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Fixity -> m Fixity Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Fixity -> m Fixity Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Fixity -> m Fixity Source # | |
Ord Fixity Source # | Since: 4.6.0.0 |
Read Fixity Source # | Since: 4.6.0.0 |
Show Fixity Source # | Since: 4.6.0.0 |
Generic Fixity Source # | |
type Rep Fixity Source # | Since: 4.7.0.0 |
Defined in GHC.Generics type Rep Fixity = D1 (MetaData "Fixity" "GHC.Generics" "base" False) (C1 (MetaCons "Prefix" PrefixI False) (U1 :: Type -> Type) :+: C1 (MetaCons "Infix" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Associativity) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Int))) |
This variant of Fixity
appears at the type level.
Since: 4.9.0.0
data Associativity Source #
Datatype to represent the associativity of a constructor
Instances
data SourceUnpackedness Source #
The unpackedness of a field as the user wrote it in the source code. For example, in the following data type:
data E = ExampleConstructor Int {-# NOUNPACK #-} Int {-# UNPACK #-} Int
The fields of ExampleConstructor
have NoSourceUnpackedness
,
SourceNoUnpack
, and SourceUnpack
, respectively.
Since: 4.9.0.0
Instances
data SourceStrictness Source #
The strictness of a field as the user wrote it in the source code. For example, in the following data type:
data E = ExampleConstructor Int ~Int !Int
The fields of ExampleConstructor
have NoSourceStrictness
,
SourceLazy
, and SourceStrict
, respectively.
Since: 4.9.0.0
Instances
data DecidedStrictness Source #
The strictness that GHC infers for a field during compilation. Whereas
there are nine different combinations of SourceUnpackedness
and
SourceStrictness
, the strictness that GHC decides will ultimately be one
of lazy, strict, or unpacked. What GHC decides is affected both by what the
user writes in the source code and by GHC flags. As an example, consider
this data type:
data E = ExampleConstructor {-# UNPACK #-} !Int !Int Int
- If compiled without optimization or other language extensions, then the
fields of
ExampleConstructor
will haveDecidedStrict
,DecidedStrict
, andDecidedLazy
, respectively. - If compiled with
-XStrictData
enabled, then the fields will haveDecidedStrict
,DecidedStrict
, andDecidedStrict
, respectively. - If compiled with
-O2
enabled, then the fields will haveDecidedUnpack
,DecidedStrict
, andDecidedLazy
, respectively.
Since: 4.9.0.0
Instances
Datatype to represent metadata associated with a datatype (MetaData
),
constructor (MetaCons
), or field selector (MetaSel
).
- In
MetaData n m p nt
,n
is the datatype's name,m
is the module in which the datatype is defined,p
is the package in which the datatype is defined, andnt
is'True
if the datatype is anewtype
. - In
MetaCons n f s
,n
is the constructor's name,f
is its fixity, ands
is'True
if the constructor contains record selectors. - In
MetaSel mn su ss ds
, if the field uses record syntax, thenmn
isJust
the record name. Otherwise,mn
isNothing
.su
andss
are the field's unpackedness and strictness annotations, andds
is the strictness that GHC infers for the field.
Since: 4.9.0.0
MetaData Symbol Symbol Symbol Bool | |
MetaCons Symbol FixityI Bool | |
MetaSel (Maybe Symbol) SourceUnpackedness SourceStrictness DecidedStrictness |
Instances
(KnownSymbol n, SingI f, SingI r) => Constructor (MetaCons n f r :: Meta) Source # | Since: 4.9.0.0 |
(KnownSymbol n, KnownSymbol m, KnownSymbol p, SingI nt) => Datatype (MetaData n m p nt :: Meta) Source # | Since: 4.9.0.0 |
(SingI mn, SingI su, SingI ss, SingI ds) => Selector (MetaSel mn su ss ds :: Meta) Source # | Since: 4.9.0.0 |
Defined in GHC.Generics selName :: t (MetaSel mn su ss ds) f a -> [Char] Source # selSourceUnpackedness :: t (MetaSel mn su ss ds) f a -> SourceUnpackedness Source # selSourceStrictness :: t (MetaSel mn su ss ds) f a -> SourceStrictness Source # selDecidedStrictness :: t (MetaSel mn su ss ds) f a -> DecidedStrictness Source # |
Generic type classes
class Generic a where Source #
Representable types of kind *
.
This class is derivable in GHC with the DeriveGeneric
flag on.
A Generic
instance must satisfy the following laws:
from
.to
≡id
to
.from
≡id
Convert from the datatype to its representation
Convert from the representation to the datatype
Instances
class Generic1 (f :: k -> Type) where Source #
Representable types of kind * -> *
(or kind k -> *
, when PolyKinds
is enabled).
This class is derivable in GHC with the DeriveGeneric
flag on.
A Generic1
instance must satisfy the following laws:
from1
.to1
≡id
to1
.from1
≡id
from1 :: f a -> Rep1 f a Source #
Convert from the datatype to its representation
to1 :: Rep1 f a -> f a Source #
Convert from the representation to the datatype