Safe Haskell | None |
---|---|
Language | Haskell2010 |
Servant.Client.Core.HasClient
Synopsis
- clientIn :: HasClient m api => Proxy api -> Proxy m -> Client m api
- class RunClient m => HasClient m api where
- data EmptyClient = EmptyClient
- data AsClientT (m :: * -> *)
- (//) :: a -> (a -> b) -> b
- (/:) :: (a -> b -> c) -> b -> a -> c
- foldMapUnion :: forall c a (as :: [ Type ]). All c as => Proxy c -> ( forall x. c x => x -> a) -> Union as -> a
- matchUnion :: forall a (as :: [ Type ]). IsMember a as => Union as -> Maybe a
Documentation
clientIn :: HasClient m api => Proxy api -> Proxy m -> Client m api Source #
clientIn
allows you to produce operations to query an API from a client
within a
RunClient
monad.
type MyApi = "books" :> Get '[JSON] [Book] -- GET /books :<|> "books" :> ReqBody '[JSON] Book :> Post '[JSON] Book -- POST /books myApi :: Proxy MyApi myApi = Proxy clientM :: Proxy ClientM clientM = Proxy getAllBooks :: ClientM [Book] postNewBook :: Book -> ClientM Book (getAllBooks :<|> postNewBook) = myApi `clientIn` clientM
class RunClient m => HasClient m api where Source #
This class lets us define how each API combinator influences the creation of an HTTP request.
Unless you are writing a new backend for
servant-client-core
or new
combinators that you want to support client-generation, you can ignore this
class.
Methods
clientWithRoute :: Proxy m -> Proxy api -> Request -> Client m api Source #
hoistClientMonad :: Proxy m -> Proxy api -> ( forall x. mon x -> mon' x) -> Client mon api -> Client mon' api Source #
Instances
( RunClient m, TypeError ( NoInstanceFor ( HasClient m api)) :: Constraint ) => HasClient m api Source # | |
RunClient m => HasClient m Raw Source # |
Pick a
|
RunClient m => HasClient m EmptyAPI Source # |
The client for
type MyAPI = "books" :> Get '[JSON] [Book] -- GET /books :<|> "nothing" :> EmptyAPI myApi :: Proxy MyApi myApi = Proxy getAllBooks :: ClientM [Book] (getAllBooks :<|> EmptyClient) = client myApi |
Defined in Servant.Client.Core.HasClient |
|
( forall (n :: Type -> Type ). GClient api n, HasClient m ( ToServantApi api), RunClient m) => HasClient m ( NamedRoutes api) Source # | |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( NamedRoutes api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( NamedRoutes api) -> Request -> Client m ( NamedRoutes api) Source # hoistClientMonad :: Proxy m -> Proxy ( NamedRoutes api) -> ( forall x. mon x -> mon' x) -> Client mon ( NamedRoutes api) -> Client mon' ( NamedRoutes api) Source # |
|
( RunClient m, ReflectMethod method) => HasClient m ( NoContentVerb method) Source # | |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( NoContentVerb method) Source # Methods clientWithRoute :: Proxy m -> Proxy ( NoContentVerb method) -> Request -> Client m ( NoContentVerb method) Source # hoistClientMonad :: Proxy m -> Proxy ( NoContentVerb method) -> ( forall x. mon x -> mon' x) -> Client mon ( NoContentVerb method) -> Client mon' ( NoContentVerb method) Source # |
|
( HasClient m a, HasClient m b) => HasClient m (a :<|> b) Source # |
A client querying function for
type MyApi = "books" :> Get '[JSON] [Book] -- GET /books :<|> "books" :> ReqBody '[JSON] Book :> Post Book -- POST /books myApi :: Proxy MyApi myApi = Proxy getAllBooks :: ClientM [Book] postNewBook :: Book -> ClientM Book (getAllBooks :<|> postNewBook) = client myApi |
Defined in Servant.Client.Core.HasClient |
|
( RunClient m, TypeError ( NoInstanceForSub ( HasClient m) ty) :: Constraint ) => HasClient m (ty :> sub) Source # | |
Defined in Servant.Client.Core.HasClient |
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( RunClient m, TypeError ( PartialApplication HasClient arr) :: Constraint ) => HasClient m (arr :> sub) Source # | |
Defined in Servant.Client.Core.HasClient |
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HasClient m api => HasClient m ( BasicAuth realm usr :> api) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( BasicAuth realm usr :> api) -> Request -> Client m ( BasicAuth realm usr :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( BasicAuth realm usr :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( BasicAuth realm usr :> api) -> Client mon' ( BasicAuth realm usr :> api) Source # |
|
( AtLeastOneFragment api, FragmentUnique ( Fragment a :> api), HasClient m api) => HasClient m ( Fragment a :> api) Source # |
Ignore
Example: type MyApi = "books" :> Fragment Text :> Get '[JSON] [Book] myApi :: Proxy MyApi myApi = Proxy getBooks :: ClientM [Book] getBooks = client myApi -- then you can just use "getBooksBy" to query that endpoint. -- 'getBooks' for all books. |
Defined in Servant.Client.Core.HasClient |
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HasClient m api => HasClient m ( AuthProtect tag :> api) Source # | |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( AuthProtect tag :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( AuthProtect tag :> api) -> Request -> Client m ( AuthProtect tag :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( AuthProtect tag :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( AuthProtect tag :> api) -> Client mon' ( AuthProtect tag :> api) Source # |
|
HasClient m subapi => HasClient m ( WithNamedContext name context subapi) Source # | |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( WithNamedContext name context subapi) Source # Methods clientWithRoute :: Proxy m -> Proxy ( WithNamedContext name context subapi) -> Request -> Client m ( WithNamedContext name context subapi) Source # hoistClientMonad :: Proxy m -> Proxy ( WithNamedContext name context subapi) -> ( forall x. mon x -> mon' x) -> Client mon ( WithNamedContext name context subapi) -> Client mon' ( WithNamedContext name context subapi) Source # |
|
HasClient m api => HasClient m ( IsSecure :> api) Source # | |
Defined in Servant.Client.Core.HasClient |
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HasClient m api => HasClient m ( RemoteHost :> api) Source # | |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( RemoteHost :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( RemoteHost :> api) -> Request -> Client m ( RemoteHost :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( RemoteHost :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( RemoteHost :> api) -> Client mon' ( RemoteHost :> api) Source # |
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HasClient m api => HasClient m ( Vault :> api) Source # | |
Defined in Servant.Client.Core.HasClient |
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( KnownSymbol path, HasClient m api) => HasClient m (path :> api) Source # |
Make the querying function append
|
Defined in Servant.Client.Core.HasClient |
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( HasClient m api, MimeRender ctype chunk, FramingRender framing, ToSourceIO chunk a) => HasClient m ( StreamBody' mods framing ctype a :> api) Source # | |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( StreamBody' mods framing ctype a :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( StreamBody' mods framing ctype a :> api) -> Request -> Client m ( StreamBody' mods framing ctype a :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( StreamBody' mods framing ctype a :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( StreamBody' mods framing ctype a :> api) -> Client mon' ( StreamBody' mods framing ctype a :> api) Source # |
|
( MimeRender ct a, HasClient m api) => HasClient m ( ReqBody' mods (ct ': cts) a :> api) Source # |
If you use a
All you need is for your type to have a
Example: type MyApi = "books" :> ReqBody '[JSON] Book :> Post '[JSON] Book myApi :: Proxy MyApi myApi = Proxy addBook :: Book -> ClientM Book addBook = client myApi -- then you can just use "addBook" to query that endpoint |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( ReqBody' mods (ct ': cts) a :> api) -> Request -> Client m ( ReqBody' mods (ct ': cts) a :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( ReqBody' mods (ct ': cts) a :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( ReqBody' mods (ct ': cts) a :> api) -> Client mon' ( ReqBody' mods (ct ': cts) a :> api) Source # |
|
( KnownSymbol sym, HasClient m api) => HasClient m ( QueryFlag sym :> api) Source # |
If you use a
If you give
Otherwise, this function will insert a value-less query string
parameter under the name associated to your
Example: type MyApi = "books" :> QueryFlag "published" :> Get '[JSON] [Book] myApi :: Proxy MyApi myApi = Proxy getBooks :: Bool -> ClientM [Book] getBooks = client myApi -- then you can just use "getBooks" to query that endpoint. -- 'getBooksBy False' for all books -- 'getBooksBy True' to only get _already published_ books |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( QueryFlag sym :> api) -> Request -> Client m ( QueryFlag sym :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( QueryFlag sym :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( QueryFlag sym :> api) -> Client mon' ( QueryFlag sym :> api) Source # |
|
( KnownSymbol sym, ToHttpApiData a, HasClient m api) => HasClient m ( QueryParams sym a :> api) Source # |
If you use a
If you give an empty list, nothing will be added to the query string. Otherwise, this function will take care of inserting a textual representation of your values in the query string, under the same query string parameter name.
You can control how values for your type are turned into
text by specifying a
Example: type MyApi = "books" :> QueryParams "authors" Text :> Get '[JSON] [Book] myApi :: Proxy MyApi myApi = Proxy getBooksBy :: [Text] -> ClientM [Book] getBooksBy = client myApi -- then you can just use "getBooksBy" to query that endpoint. -- 'getBooksBy []' for all books -- 'getBooksBy ["Isaac Asimov", "Robert A. Heinlein"]' -- to get all books by Asimov and Heinlein |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( QueryParams sym a :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( QueryParams sym a :> api) -> Request -> Client m ( QueryParams sym a :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( QueryParams sym a :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( QueryParams sym a :> api) -> Client mon' ( QueryParams sym a :> api) Source # |
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( KnownSymbol sym, ToHttpApiData a, HasClient m api, SBoolI ( FoldRequired mods)) => HasClient m ( QueryParam' mods sym a :> api) Source # |
If you use a
If you give Nothing, nothing will be added to the query string.
If you give a non-
You can control how values for your type are turned into
text by specifying a
Example: type MyApi = "books" :> QueryParam "author" Text :> Get '[JSON] [Book] myApi :: Proxy MyApi myApi = Proxy getBooksBy :: Maybe Text -> ClientM [Book] getBooksBy = client myApi -- then you can just use "getBooksBy" to query that endpoint. -- 'getBooksBy Nothing' for all books -- 'getBooksBy (Just "Isaac Asimov")' to get all books by Isaac Asimov |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( QueryParam' mods sym a :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( QueryParam' mods sym a :> api) -> Request -> Client m ( QueryParam' mods sym a :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( QueryParam' mods sym a :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( QueryParam' mods sym a :> api) -> Client mon' ( QueryParam' mods sym a :> api) Source # |
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HasClient m api => HasClient m ( Description desc :> api) Source # |
Ignore
|
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( Description desc :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( Description desc :> api) -> Request -> Client m ( Description desc :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( Description desc :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( Description desc :> api) -> Client mon' ( Description desc :> api) Source # |
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HasClient m api => HasClient m ( Summary desc :> api) Source # |
Ignore
|
Defined in Servant.Client.Core.HasClient |
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HasClient m api => HasClient m ( HttpVersion :> api) Source # |
Using a
|
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( HttpVersion :> api) Source # Methods clientWithRoute :: Proxy m -> Proxy ( HttpVersion :> api) -> Request -> Client m ( HttpVersion :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( HttpVersion :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( HttpVersion :> api) -> Client mon' ( HttpVersion :> api) Source # |
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( KnownSymbol sym, ToHttpApiData a, HasClient m api, SBoolI ( FoldRequired mods)) => HasClient m ( Header' mods sym a :> api) Source # |
If you use a
That function will take care of encoding this argument as Text in the request headers.
All you need is for your type to have a
Example: newtype Referer = Referer { referrer :: Text } deriving (Eq, Show, Generic, ToHttpApiData) -- GET /view-my-referer type MyApi = "view-my-referer" :> Header "Referer" Referer :> Get '[JSON] Referer myApi :: Proxy MyApi myApi = Proxy viewReferer :: Maybe Referer -> ClientM Book viewReferer = client myApi -- then you can just use "viewRefer" to query that endpoint -- specifying Nothing or e.g Just "http://haskell.org/" as arguments |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Header' mods sym a :> api) -> Request -> Client m ( Header' mods sym a :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( Header' mods sym a :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( Header' mods sym a :> api) -> Client mon' ( Header' mods sym a :> api) Source # |
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( RunClient m, contentTypes ~ (contentType ': otherContentTypes), as ~ (a ': as'), AllMime contentTypes, ReflectMethod method, All (UnrenderResponse contentTypes) as, All HasStatus as, HasStatuses as', Unique ( Statuses as)) => HasClient m ( UVerb method contentTypes as) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( UVerb method contentTypes as) -> Request -> Client m ( UVerb method contentTypes as) Source # hoistClientMonad :: Proxy m -> Proxy ( UVerb method contentTypes as) -> ( forall x. mon x -> mon' x) -> Client mon ( UVerb method contentTypes as) -> Client mon' ( UVerb method contentTypes as) Source # |
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( KnownSymbol capture, ToHttpApiData a, HasClient m sublayout) => HasClient m ( CaptureAll capture a :> sublayout) Source # |
If you use a
You can control how these values are turned into text by specifying
a
Example: type MyAPI = "src" :> CaptureAll Text -> Get '[JSON] SourceFile myApi :: Proxy myApi = Proxy getSourceFile :: [Text] -> ClientM SourceFile getSourceFile = client myApi -- then you can use "getSourceFile" to query that endpoint |
Defined in Servant.Client.Core.HasClient Associated Types type Client m ( CaptureAll capture a :> sublayout) Source # Methods clientWithRoute :: Proxy m -> Proxy ( CaptureAll capture a :> sublayout) -> Request -> Client m ( CaptureAll capture a :> sublayout) Source # hoistClientMonad :: Proxy m -> Proxy ( CaptureAll capture a :> sublayout) -> ( forall x. mon x -> mon' x) -> Client mon ( CaptureAll capture a :> sublayout) -> Client mon' ( CaptureAll capture a :> sublayout) Source # |
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( KnownSymbol capture, ToHttpApiData a, HasClient m api) => HasClient m ( Capture' mods capture a :> api) Source # |
If you use a
You can control how values for this type are turned into
text by specifying a
Example: type MyApi = "books" :> Capture "isbn" Text :> Get '[JSON] Book myApi :: Proxy MyApi myApi = Proxy getBook :: Text -> ClientM Book getBook = client myApi -- then you can just use "getBook" to query that endpoint |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Capture' mods capture a :> api) -> Request -> Client m ( Capture' mods capture a :> api) Source # hoistClientMonad :: Proxy m -> Proxy ( Capture' mods capture a :> api) -> ( forall x. mon x -> mon' x) -> Client mon ( Capture' mods capture a :> api) -> Client mon' ( Capture' mods capture a :> api) Source # |
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( RunClient m, BuildHeadersTo ls, ReflectMethod method, KnownNat status) => HasClient m ( Verb method status cts ( Headers ls NoContent )) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Verb method status cts ( Headers ls NoContent )) -> Request -> Client m ( Verb method status cts ( Headers ls NoContent )) Source # hoistClientMonad :: Proxy m -> Proxy ( Verb method status cts ( Headers ls NoContent )) -> ( forall x. mon x -> mon' x) -> Client mon ( Verb method status cts ( Headers ls NoContent )) -> Client mon' ( Verb method status cts ( Headers ls NoContent )) Source # |
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( RunClient m, MimeUnrender ct a, BuildHeadersTo ls, KnownNat status, ReflectMethod method, cts' ~ (ct ': cts)) => HasClient m ( Verb method status cts' ( Headers ls a)) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Verb method status cts' ( Headers ls a)) -> Request -> Client m ( Verb method status cts' ( Headers ls a)) Source # hoistClientMonad :: Proxy m -> Proxy ( Verb method status cts' ( Headers ls a)) -> ( forall x. mon x -> mon' x) -> Client mon ( Verb method status cts' ( Headers ls a)) -> Client mon' ( Verb method status cts' ( Headers ls a)) Source # |
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( RunClient m, ReflectMethod method, KnownNat status) => HasClient m ( Verb method status cts NoContent ) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Verb method status cts NoContent ) -> Request -> Client m ( Verb method status cts NoContent ) Source # hoistClientMonad :: Proxy m -> Proxy ( Verb method status cts NoContent ) -> ( forall x. mon x -> mon' x) -> Client mon ( Verb method status cts NoContent ) -> Client mon' ( Verb method status cts NoContent ) Source # |
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( RunClient m, MimeUnrender ct a, ReflectMethod method, cts' ~ (ct ': cts), KnownNat status) => HasClient m ( Verb method status cts' a) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Verb method status cts' a) -> Request -> Client m ( Verb method status cts' a) Source # hoistClientMonad :: Proxy m -> Proxy ( Verb method status cts' a) -> ( forall x. mon x -> mon' x) -> Client mon ( Verb method status cts' a) -> Client mon' ( Verb method status cts' a) Source # |
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( RunStreamingClient m, MimeUnrender ct chunk, ReflectMethod method, FramingUnrender framing, FromSourceIO chunk a, BuildHeadersTo hs) => HasClient m ( Stream method status framing ct ( Headers hs a)) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Stream method status framing ct ( Headers hs a)) -> Request -> Client m ( Stream method status framing ct ( Headers hs a)) Source # hoistClientMonad :: Proxy m -> Proxy ( Stream method status framing ct ( Headers hs a)) -> ( forall x. mon x -> mon' x) -> Client mon ( Stream method status framing ct ( Headers hs a)) -> Client mon' ( Stream method status framing ct ( Headers hs a)) Source # |
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( RunStreamingClient m, MimeUnrender ct chunk, ReflectMethod method, FramingUnrender framing, FromSourceIO chunk a) => HasClient m ( Stream method status framing ct a) Source # | |
Defined in Servant.Client.Core.HasClient Methods clientWithRoute :: Proxy m -> Proxy ( Stream method status framing ct a) -> Request -> Client m ( Stream method status framing ct a) Source # hoistClientMonad :: Proxy m -> Proxy ( Stream method status framing ct a) -> ( forall x. mon x -> mon' x) -> Client mon ( Stream method status framing ct a) -> Client mon' ( Stream method status framing ct a) Source # |
data EmptyClient Source #
Singleton type representing a client for an empty API.
Constructors
EmptyClient |
Instances
Bounded EmptyClient Source # | |
Defined in Servant.Client.Core.HasClient |
|
Enum EmptyClient Source # | |
Defined in Servant.Client.Core.HasClient Methods succ :: EmptyClient -> EmptyClient Source # pred :: EmptyClient -> EmptyClient Source # toEnum :: Int -> EmptyClient Source # fromEnum :: EmptyClient -> Int Source # enumFrom :: EmptyClient -> [ EmptyClient ] Source # enumFromThen :: EmptyClient -> EmptyClient -> [ EmptyClient ] Source # enumFromTo :: EmptyClient -> EmptyClient -> [ EmptyClient ] Source # enumFromThenTo :: EmptyClient -> EmptyClient -> EmptyClient -> [ EmptyClient ] Source # |
|
Eq EmptyClient Source # | |
Defined in Servant.Client.Core.HasClient Methods (==) :: EmptyClient -> EmptyClient -> Bool Source # (/=) :: EmptyClient -> EmptyClient -> Bool Source # |
|
Show EmptyClient Source # | |
Defined in Servant.Client.Core.HasClient |
data AsClientT (m :: * -> *) Source #
A type that specifies that an API record contains a client implementation.
(//) :: a -> (a -> b) -> b infixl 1 Source #
Helper to make code using records of clients more readable.
Can be mixed with (/:) for supplying arguments.
Example:
@@ type Api = NamedRoutes RootApi
data RootApi mode = RootApi { subApi :: mode :- NamedRoutes SubApi , … } deriving Generic
data SubApi mode = SubApi { endpoint :: mode :- Get '[JSON] Person , … } deriving Generic
api :: Proxy API api = Proxy
rootClient :: RootApi (AsClientT ClientM) rootClient = client api
endpointClient :: ClientM Person endpointClient = client / subApi / endpoint @@
(/:) :: (a -> b -> c) -> b -> a -> c infixl 2 Source #
Convenience function for supplying arguments to client functions when working with records of clients.
Intended to be used in conjunction with
(//)
.
Example:
@@ type Api = NamedRoutes RootApi
data RootApi mode = RootApi { subApi :: mode :- Capture "token" String :> NamedRoutes SubApi , hello :: mode :- Capture "name" String :> Get '[JSON] String , … } deriving Generic
data SubApi mode = SubApi { endpoint :: mode :- Get '[JSON] Person , … } deriving Generic
api :: Proxy API api = Proxy
rootClient :: RootApi (AsClientT ClientM) rootClient = client api
hello :: String -> ClientM String hello name = rootClient / hello : name
endpointClient :: ClientM Person endpointClient = client / subApi : "foobar123" // endpoint @@
foldMapUnion :: forall c a (as :: [ Type ]). All c as => Proxy c -> ( forall x. c x => x -> a) -> Union as -> a Source #
Convenience function to apply a function to an unknown union element using a type class. All elements of the union must have instances in the type class, and the function is applied unconditionally.
See also:
matchUnion
.
matchUnion :: forall a (as :: [ Type ]). IsMember a as => Union as -> Maybe a Source #
Convenience function to extract a union element using
cast
, ie. return the value if the
selected type happens to be the actual type of the union in this value, or
Nothing
otherwise.
See also:
foldMapUnion
.