Hoogle Search

Within LTS Haskell 24.6 (ghc-9.10.2)

Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.

Exact lookup

1. lookupResponseHeader :: forall (h :: Symbol) a (headers :: [Type]) r . HasResponseHeader h a headers => Headers headers r -> ResponseHeader h a

   servant	Servant.API

   Look up a specific ResponseHeader, without having to know what position it is in the HList.

   >>> let example1 = addHeader 5 "hi" :: Headers '[Header "someheader" Int] String
   
   >>> let example2 = addHeader True example1 :: Headers '[Header "1st" Bool, Header "someheader" Int] String
   
   >>> lookupResponseHeader example2 :: ResponseHeader "someheader" Int
   Header 5
   

   >>> lookupResponseHeader example2 :: ResponseHeader "1st" Bool
   Header True
   

   Usage of this function relies on an explicit type annotation of the header to be looked up. This can be done with type annotations on the result, or with an explicit type application. In this example, the type of header value is determined by the type-inference, we only specify the name of the header:

   >>> :set -XTypeApplications
   
   >>> case lookupResponseHeader @"1st" example2 of { Header b -> b ; _ -> False }
   True
   

2. lookupResponseHeader :: forall (h :: Symbol) a (headers :: [Type]) r . HasResponseHeader h a headers => Headers headers r -> ResponseHeader h a

   servant	Servant.API.ResponseHeaders

   Look up a specific ResponseHeader, without having to know what position it is in the HList.

   >>> let example1 = addHeader 5 "hi" :: Headers '[Header "someheader" Int] String
   
   >>> let example2 = addHeader True example1 :: Headers '[Header "1st" Bool, Header "someheader" Int] String
   
   >>> lookupResponseHeader example2 :: ResponseHeader "someheader" Int
   Header 5
   

   >>> lookupResponseHeader example2 :: ResponseHeader "1st" Bool
   Header True
   

   Usage of this function relies on an explicit type annotation of the header to be looked up. This can be done with type annotations on the result, or with an explicit type application. In this example, the type of header value is determined by the type-inference, we only specify the name of the header:

   >>> :set -XTypeApplications
   
   >>> case lookupResponseHeader @"1st" example2 of { Header b -> b ; _ -> False }
   True
   

3. lookupAnchor :: AnchorName -> YamlParser (Maybe YamlValue)

   yaml	Data.Yaml.Parser

   No documentation available.

4. lookupComponent :: PackageDescription -> ComponentName -> Maybe Component

   Cabal	Distribution.Simple.LocalBuildInfo

   No documentation available.

5. lookupComponentId :: PackageIndex a -> ComponentId -> Maybe a

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by component identifier. In the absence of Backpack, this is just a lookupUnitId.

6. lookupDependency :: InstalledPackageIndex -> PackageName -> VersionRange -> [(Version, [InstalledPackageInfo])]

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by source package name and a range of versions. We get back any number of versions of the specified package name, all satisfying the version range constraint. This does NOT work for internal dependencies, DO NOT use this function on those; use lookupInternalDependency instead. INVARIANT: List of eligible InstalledPackageInfo is non-empty.

7. lookupInternalDependency :: InstalledPackageIndex -> PackageName -> VersionRange -> LibraryName -> [(Version, [InstalledPackageInfo])]

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by source package name and a range of versions. We get back any number of versions of the specified package name, all satisfying the version range constraint. INVARIANT: List of eligible InstalledPackageInfo is non-empty.

8. lookupPackageId :: PackageIndex a -> PackageId -> Maybe a

   Cabal	Distribution.Simple.PackageIndex

   Convenient alias of lookupSourcePackageId, but assuming only one package per package ID.

9. lookupPackageName :: PackageIndex a -> PackageName -> [(Version, [a])]

   Cabal	Distribution.Simple.PackageIndex

   Does a lookup by source package name.

10. lookupSourcePackageId :: PackageIndex a -> PackageId -> [a]

    Cabal	Distribution.Simple.PackageIndex

    Does a lookup by source package id (name & version). There can be multiple installed packages with the same source PackageId but different UnitId. They are returned in order of preference, with the most preferred first.

Page 40 of many | Previous | Next