vector-0.10.0.1: Efficient Arrays

Portability | non-portable
Stability | experimental
Maintainer | Roman Leshchinskiy <rl@cse.unsw.edu.au>
Safe Haskell | None

Data.Vector.Storable.Mutable

Contents

- Mutable vectors of `Storable` types
- Accessors
  - Length information
  - Extracting subvectors
  - Overlapping
- Construction
  - Initialisation
  - Growing
  - Restricting memory usage
- Accessing individual elements
- Modifying vectors
  - Filling and copying
- Unsafe conversions
- Raw pointers

Description

Mutable vectors based on Storable.

Synopsis

- data MVector s a = MVector !Int !(ForeignPtr a)
- type IOVector = MVector RealWorld
- type STVector s = MVector s
- class Storable a
- length :: Storable a => MVector s a -> Int
- null :: Storable a => MVector s a -> Bool
- slice :: Storable a => Int -> Int -> MVector s a -> MVector s a
- init :: Storable a => MVector s a -> MVector s a
- tail :: Storable a => MVector s a -> MVector s a
- take :: Storable a => Int -> MVector s a -> MVector s a
- drop :: Storable a => Int -> MVector s a -> MVector s a
- splitAt :: Storable a => Int -> MVector s a -> (MVector s a, MVector s a)
- unsafeSlice :: Storable a => Int -> Int -> MVector s a -> MVector s a
- unsafeInit :: Storable a => MVector s a -> MVector s a
- unsafeTail :: Storable a => MVector s a -> MVector s a
- unsafeTake :: Storable a => Int -> MVector s a -> MVector s a
- unsafeDrop :: Storable a => Int -> MVector s a -> MVector s a
- overlaps :: Storable a => MVector s a -> MVector s a -> Bool
- new :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a)
- unsafeNew :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a)
- replicate :: (PrimMonad m, Storable a) => Int -> a -> m (MVector (PrimState m) a)
- replicateM :: (PrimMonad m, Storable a) => Int -> m a -> m (MVector (PrimState m) a)
- clone :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> m (MVector (PrimState m) a)
- grow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a)
- unsafeGrow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a)
- clear :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> m ()
- read :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m a
- write :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> a -> m ()
- swap :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> Int -> m ()
- unsafeRead :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m a
- unsafeWrite :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> a -> m ()
- unsafeSwap :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> Int -> m ()
- set :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> a -> m ()
- copy :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- move :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- unsafeCopy :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- unsafeMove :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- unsafeCast :: forall a b s. (Storable a, Storable b) => MVector s a -> MVector s b
- unsafeFromForeignPtr :: Storable a => ForeignPtr a -> Int -> Int -> MVector s a
- unsafeFromForeignPtr0 :: Storable a => ForeignPtr a -> Int -> MVector s a
- unsafeToForeignPtr :: Storable a => MVector s a -> (ForeignPtr a, Int, Int)
- unsafeToForeignPtr0 :: Storable a => MVector s a -> (ForeignPtr a, Int)
- unsafeWith :: Storable a => IOVector a -> (Ptr a -> IO b) -> IO b

# Mutable vectors of `Storable` types

data MVector s a Source

Mutable `Storable`-based vectors

Constructors

MVector !Int !(ForeignPtr a) |

Instances

Typeable2 MVector |
Storable a => MVector MVector a |
NFData (MVector s a) |

type IOVector = MVector RealWorld Source

type STVector s = MVector sSource

class Storable a

The member functions of this class facilitate writing values of primitive types to raw memory (which may have been allocated with the above mentioned routines) and reading values from blocks of raw memory. The class, furthermore, includes support for computing the storage requirements and alignment restrictions of storable types.

Memory addresses are represented as values of type ``Ptr` a`, for some `a` which is an instance of class `Storable`. The type argument to `Ptr` helps provide some valuable type safety in FFI code (you can't mix pointers of different types without an explicit cast), while helping the Haskell type system figure out which marshalling method is needed for a given pointer.

All marshalling between Haskell and a foreign language ultimately boils down to translating Haskell data structures into the binary representation of a corresponding data structure of the foreign language and vice versa. To code this marshalling in Haskell, it is necessary to manipulate primitive data types stored in unstructured memory blocks. The class `Storable` facilitates this manipulation on all types for which it is instantiated, which are the standard basic types of Haskell, the fixed size `Int` types (`Int8`, `Int16`, `Int32`, `Int64`), the fixed size `Word` types (`Word8`, `Word16`, `Word32`, `Word64`), `StablePtr`, all types from Foreign.C.Types, as well as `Ptr`.

Minimal complete definition: `sizeOf`, `alignment`, one of `peek`, `peekElemOff` and `peekByteOff`, and one of `poke`, `pokeElemOff` and `pokeByteOff`.

Instances

Storable Bool |
Storable Char |
Storable Double |
Storable Float |
Storable Int |
Storable Int8 |
Storable Int16 |
Storable Int32 |
Storable Int64 |
Storable Word |
Storable Word8 |
Storable Word16 |
Storable Word32 |
Storable Word64 |
Storable WordPtr |
Storable IntPtr |
Storable CChar |
Storable CSChar |
Storable CUChar |
Storable CShort |
Storable CUShort |
Storable CInt |
Storable CUInt |
Storable CLong |
Storable CULong |
Storable CLLong |
Storable CULLong |
Storable CFloat |
Storable CDouble |
Storable CPtrdiff |
Storable CSize |
Storable CWchar |
Storable CSigAtomic |
Storable CClock |
Storable CTime |
Storable CUSeconds |
Storable CSUSeconds |
Storable CIntPtr |
Storable CUIntPtr |
Storable CIntMax |
Storable CUIntMax |
Storable Fingerprint |
Storable (StablePtr a) |
Storable (Ptr a) |
Storable (FunPtr a) |

# Accessors

## Length information

length :: Storable a => MVector s a -> Int Source

Length of the mutable vector.

null :: Storable a => MVector s a -> Bool Source

Check whether the vector is empty

## Extracting subvectors

slice :: Storable a => Int -> Int -> MVector s a -> MVector s aSource

Yield a part of the mutable vector without copying it.

init :: Storable a => MVector s a -> MVector s aSource

tail :: Storable a => MVector s a -> MVector s aSource

take :: Storable a => Int -> MVector s a -> MVector s aSource

drop :: Storable a => Int -> MVector s a -> MVector s aSource

splitAt :: Storable a => Int -> MVector s a -> (MVector s a, MVector s a)Source

unsafeSlice Source

Arguments

:: Storable a |
=> Int | starting index
-> Int | length of the slice
-> MVector s a |
-> MVector s a |

Yield a part of the mutable vector without copying it. No bounds checks are performed.

unsafeInit :: Storable a => MVector s a -> MVector s aSource

unsafeTail :: Storable a => MVector s a -> MVector s aSource

unsafeTake :: Storable a => Int -> MVector s a -> MVector s aSource

unsafeDrop :: Storable a => Int -> MVector s a -> MVector s aSource

## Overlapping

overlaps :: Storable a => MVector s a -> MVector s a -> Bool Source

# Construction

## Initialisation

new :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a)Source

Create a mutable vector of the given length.

unsafeNew :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a)Source

Create a mutable vector of the given length. The length is not checked.

replicate :: (PrimMonad m, Storable a) => Int -> a -> m (MVector (PrimState m) a)Source

Create a mutable vector of the given length (0 if the length is negative) and fill it with an initial value.

replicateM :: (PrimMonad m, Storable a) => Int -> m a -> m (MVector (PrimState m) a)Source

Create a mutable vector of the given length (0 if the length is negative) and fill it with values produced by repeatedly executing the monadic action.

clone :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> m (MVector (PrimState m) a)Source

Create a copy of a mutable vector.

## Growing

grow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a)Source

Grow a vector by the given number of elements. The number must be positive.

unsafeGrow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a)Source

Grow a vector by the given number of elements. The number must be positive but this is not checked.

## Restricting memory usage

clear :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> m ()Source

Reset all elements of the vector to some undefined value, clearing all references to external objects. This is usually a noop for unboxed vectors.

# Accessing individual elements

read :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m aSource

Yield the element at the given position.

write :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> a -> m ()Source

Replace the element at the given position.

swap :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> Int -> m ()Source

Swap the elements at the given positions.

unsafeRead :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m aSource

Yield the element at the given position. No bounds checks are performed.

unsafeWrite :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> a -> m ()Source

Replace the element at the given position. No bounds checks are performed.

unsafeSwap :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> Int -> m ()Source

Swap the elements at the given positions. No bounds checks are performed.

# Modifying vectors

## Filling and copying

set :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> a -> m ()Source

Set all elements of the vector to the given value.

copy :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()Source

Copy a vector. The two vectors must have the same length and may not overlap.

move :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()Source

Move the contents of a vector. The two vectors must have the same length.

If the vectors do not overlap, then this is equivalent to `copy`. Otherwise, the copying is performed as if the source vector were copied to a temporary vector and then the temporary vector was copied to the target vector.

unsafeCopy Source

Arguments

:: (PrimMonad m, Storable a) |
=> MVector (PrimState m) a | target
-> MVector (PrimState m) a | source
-> m () |

Copy a vector. The two vectors must have the same length and may not overlap. This is not checked.

unsafeMove Source

Arguments

:: (PrimMonad m, Storable a) |
=> MVector (PrimState m) a | target
-> MVector (PrimState m) a | source
-> m () |

Move the contents of a vector. The two vectors must have the same length, but this is not checked.

If the vectors do not overlap, then this is equivalent to `unsafeCopy`. Otherwise, the copying is performed as if the source vector were copied to a temporary vector and then the temporary vector was copied to the target vector.

# Unsafe conversions

unsafeCast :: forall a b s. (Storable a, Storable b) => MVector s a -> MVector s bSource

O(1) Unsafely cast a mutable vector from one element type to another. The operation just changes the type of the underlying pointer and does not modify the elements.

The resulting vector contains as many elements as can fit into the underlying memory block.

# Raw pointers

unsafeFromForeignPtr Source

Arguments

:: Storable a |
=> ForeignPtr a | pointer
-> Int | offset
-> Int | length
-> MVector s a |

Create a mutable vector from a `ForeignPtr` with an offset and a length.

Modifying data through the `ForeignPtr` afterwards is unsafe if the vector could have been frozen before the modification.

If your offset is 0 it is more efficient to use `unsafeFromForeignPtr0`.

unsafeFromForeignPtr0 Source

Arguments

:: Storable a |
=> ForeignPtr a | pointer
-> Int | length
-> MVector s a |

O(1) Create a mutable vector from a `ForeignPtr` and a length.

It is assumed the pointer points directly to the data (no offset). Use `unsafeFromForeignPtr` if you need to specify an offset.

Modifying data through the `ForeignPtr` afterwards is unsafe if the vector could have been frozen before the modification.

unsafeToForeignPtr :: Storable a => MVector s a -> (ForeignPtr a, Int, Int)Source

Yield the underlying `ForeignPtr` together with the offset to the data and its length. Modifying the data through the `ForeignPtr` is unsafe if the vector could have frozen before the modification.

unsafeToForeignPtr0 :: Storable a => MVector s a -> (ForeignPtr a, Int)Source

O(1) Yield the underlying `ForeignPtr` together with its length.

You can assume the pointer points directly to the data (no offset).

Modifying the data through the `ForeignPtr` is unsafe if the vector could have frozen before the modification.

unsafeWith :: Storable a => IOVector a -> (Ptr a -> IO b) -> IO bSource

Pass a pointer to the vector's data to the IO action. Modifying data through the pointer is unsafe if the vector could have been frozen before the modification.