Safe Haskell | None |
---|---|

Language | Haskell98 |

A module containing semi-public StorableVector internals. This exposes the StorableVector representation and low level construction functions. Modules which extend the StorableVector system will need to use this module while ideally most users will be able to make do with the public interface modules.

- data Vector a = SV !(ForeignPtr a) !Int !Int
- unsafeHead :: Storable a => Vector a -> a
- unsafeTail :: Storable a => Vector a -> Vector a
- unsafeLast :: Storable a => Vector a -> a
- unsafeInit :: Storable a => Vector a -> Vector a
- unsafeIndex :: Storable a => Vector a -> Int -> a
- unsafeTake :: Storable a => Int -> Vector a -> Vector a
- unsafeDrop :: Storable a => Int -> Vector a -> Vector a
- create :: Storable a => Int -> (Ptr a -> IO ()) -> IO (Vector a)
- createAndTrim :: Storable a => Int -> (Ptr a -> IO Int) -> IO (Vector a)
- createAndTrim' :: Storable a => Int -> (Ptr a -> IO (Int, Int, b)) -> IO (Vector a, b)
- unsafeCreate :: Storable a => Int -> (Ptr a -> IO ()) -> Vector a
- fromForeignPtr :: ForeignPtr a -> Int -> Vector a
- toForeignPtr :: Vector a -> (ForeignPtr a, Int, Int)
- withStartPtr :: Storable a => Vector a -> (Ptr a -> Int -> IO b) -> IO b
- incPtr :: Storable a => Ptr a -> Ptr a
- inlinePerformIO :: IO a -> a

# The `Vector`

type and representation

A space-efficient representation of a vector, supporting many efficient operations.

Instances of Eq, Ord, Read, Show, Data, Typeable

SV !(ForeignPtr a) !Int !Int |

# Unchecked access

unsafeHead :: Storable a => Vector a -> a Source #

A variety of `head`

for non-empty Vectors. `unsafeHead`

omits the
check for the empty case, so there is an obligation on the programmer
to provide a proof that the Vector is non-empty.

unsafeTail :: Storable a => Vector a -> Vector a Source #

A variety of `tail`

for non-empty Vectors. `unsafeTail`

omits the
check for the empty case. As with `unsafeHead`

, the programmer must
provide a separate proof that the Vector is non-empty.

unsafeLast :: Storable a => Vector a -> a Source #

A variety of `last`

for non-empty Vectors. `unsafeLast`

omits the
check for the empty case, so there is an obligation on the programmer
to provide a proof that the Vector is non-empty.

unsafeInit :: Storable a => Vector a -> Vector a Source #

A variety of `init`

for non-empty Vectors. `unsafeInit`

omits the
check for the empty case. As with `unsafeLast`

, the programmer must
provide a separate proof that the Vector is non-empty.

unsafeIndex :: Storable a => Vector a -> Int -> a Source #

Unsafe `Vector`

index (subscript) operator, starting from 0, returning a
single element. This omits the bounds check, which means there is an
accompanying obligation on the programmer to ensure the bounds are checked in
some other way.

# Low level introduction and elimination

create :: Storable a => Int -> (Ptr a -> IO ()) -> IO (Vector a) Source #

Wrapper of mallocForeignPtrArray.

createAndTrim :: Storable a => Int -> (Ptr a -> IO Int) -> IO (Vector a) Source #

Given the maximum size needed and a function to make the contents
of a Vector, createAndTrim makes the `Vector`

. The generating
function is required to return the actual final size (<= the maximum
size), and the resulting byte array is realloced to this size.

createAndTrim is the main mechanism for creating custom, efficient Vector functions, using Haskell or C functions to fill the space.

unsafeCreate :: Storable a => Int -> (Ptr a -> IO ()) -> Vector a Source #

A way of creating Vectors outside the IO monad. The `Int`

argument gives the final size of the Vector. Unlike
`createAndTrim`

the Vector is not reallocated if the final size
is less than the estimated size.

fromForeignPtr :: ForeignPtr a -> Int -> Vector a Source #

*O(1)* Build a Vector from a ForeignPtr

toForeignPtr :: Vector a -> (ForeignPtr a, Int, Int) Source #

*O(1)* Deconstruct a ForeignPtr from a Vector

withStartPtr :: Storable a => Vector a -> (Ptr a -> Int -> IO b) -> IO b Source #

Run an action that is initialized with a pointer to the first element to be used.

inlinePerformIO :: IO a -> a Source #

Just like Unsafe.performIO, but we inline it. Big performance gains as
it exposes lots of things to further inlining. *Very unsafe*. In
particular, you should do no memory allocation inside an
`inlinePerformIO`

block. On Hugs this is just `Unsafe.performIO`

.