| Copyright | (c) GHC Developers |
|---|---|
| License | BSD-style (see the file libraries/base/LICENSE) |
| Maintainer | ffi@haskell.org |
| Stability | provisional |
| Portability | portable |
| Safe Haskell | Safe |
| Language | Haskell2010 |
Foreign.C.ConstPtr
Description
This module provides typed const pointers to foreign data. It is part
of the Foreign Function Interface (FFI).
Synopsis
- newtype ConstPtr a = ConstPtr {
- unConstPtr :: Ptr a
Documentation
A pointer with the C const qualifier. For instance, an argument of type
ConstPtr CInt would be marshalled as const int*.
While const-ness generally does not matter for ccall imports (since
const and non-const pointers typically have equivalent calling
conventions), it does matter for capi imports. See GHC #22043.
Since: base-4.18.0.0
Instances
Instances details
Instance details
Defined in GHC.Internal.Data.Data
Methods
gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ConstPtr a -> c (ConstPtr a) Source #
gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (ConstPtr a) Source #
toConstr :: ConstPtr a -> Constr Source #
dataTypeOf :: ConstPtr a -> DataType Source #
dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (ConstPtr a)) Source #
dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (ConstPtr a)) Source #
gmapT :: (forall b. Data b => b -> b) -> ConstPtr a -> ConstPtr a Source #
gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ConstPtr a -> r Source #
gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ConstPtr a -> r Source #
gmapQ :: (forall d. Data d => d -> u) -> ConstPtr a -> [u] Source #
gmapQi :: Int -> (forall d. Data d => d -> u) -> ConstPtr a -> u Source #
gmapM :: Monad m => (forall d. Data d => d -> m d) -> ConstPtr a -> m (ConstPtr a) Source #
gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ConstPtr a -> m (ConstPtr a) Source #
gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ConstPtr a -> m (ConstPtr a) Source #
Instance details
Defined in GHC.Internal.Foreign.Storable
Methods
sizeOf :: ConstPtr a -> Int Source #
alignment :: ConstPtr a -> Int Source #
peekElemOff :: Ptr (ConstPtr a) -> Int -> IO (ConstPtr a) Source #
pokeElemOff :: Ptr (ConstPtr a) -> Int -> ConstPtr a -> IO () Source #
peekByteOff :: Ptr b -> Int -> IO (ConstPtr a) Source #
pokeByteOff :: Ptr b -> Int -> ConstPtr a -> IO () Source #
Instance details
Defined in GHC.Internal.Foreign.C.ConstPtr
Methods
compare :: ConstPtr a -> ConstPtr a -> Ordering Source #
(<) :: ConstPtr a -> ConstPtr a -> Bool Source #
(<=) :: ConstPtr a -> ConstPtr a -> Bool Source #
(>) :: ConstPtr a -> ConstPtr a -> Bool Source #
(>=) :: ConstPtr a -> ConstPtr a -> Bool Source #