Ptr.Static

Documentation

data StaticPtr a

A reference to a value of type a.

Instances

IsStatic StaticPtr

Since: base-4.9.0.0

Defined in GHC.StaticPtr

Methods

fromStaticPtr :: StaticPtr a -> StaticPtr a

deRefStaticPtr :: StaticPtr a -> a

Dereferences a static pointer.

type StaticKey = Fingerprint

A key for StaticPtrs that can be serialized and used with unsafeLookupStaticPtr.

staticKey :: StaticPtr a -> StaticKey

The StaticKey that can be used to look up the given StaticPtr.

unsafeLookupStaticPtr :: StaticKey -> IO (Maybe (StaticPtr a))

Looks up a StaticPtr by its StaticKey.

If the StaticPtr is not found returns Nothing.

This function is unsafe because the program behavior is undefined if the type of the returned StaticPtr does not match the expected one.

data StaticPtrInfo

Miscelaneous information available for debugging purposes.

Constructors

StaticPtrInfo

Fields

• spInfoUnitId :: String

  Package key of the package where the static pointer is defined

• spInfoModuleName :: String

  Name of the module where the static pointer is defined

• spInfoSrcLoc :: (Int, Int)

  Source location of the definition of the static pointer as a (Line, Column) pair.

Instances

Show StaticPtrInfo

Defined in GHC.StaticPtr

Methods

showsPrec :: Int -> StaticPtrInfo -> ShowS

show :: StaticPtrInfo -> String

showList :: [StaticPtrInfo] -> ShowS

staticPtrInfo :: StaticPtr a -> StaticPtrInfo

StaticPtrInfo of the given StaticPtr.

staticPtrKeys :: IO [StaticKey]

A list of all known keys.

class IsStatic (p :: * -> *) where

A class for things buildable from static pointers.

Minimal complete definition

fromStaticPtr

Methods

fromStaticPtr :: StaticPtr a -> p a

Instances

IsStatic StaticPtr

Since: base-4.9.0.0

Defined in GHC.StaticPtr

Methods

fromStaticPtr :: StaticPtr a -> StaticPtr a