| Copyright | (c) Roman Leshchinskiy 2008-2010 |
|---|---|
| License | BSD-style |
| Maintainer | Roman Leshchinskiy <rl@cse.unsw.edu.au> |
| Stability | experimental |
| Portability | non-portable |
| Safe Haskell | None |
| Language | Haskell2010 |
Data.Vector.Primitive.Mutable
Description
Mutable primitive vectors.
Synopsis
- data MVector s a = MVector !Int !Int !(MutableByteArray s)
- type IOVector = MVector RealWorld
- type STVector s = MVector s
- class Prim a
- length :: Prim a => MVector s a -> Int
- null :: Prim a => MVector s a -> Bool
- slice :: Prim a => Int -> Int -> MVector s a -> MVector s a
- init :: Prim a => MVector s a -> MVector s a
- tail :: Prim a => MVector s a -> MVector s a
- take :: Prim a => Int -> MVector s a -> MVector s a
- drop :: Prim a => Int -> MVector s a -> MVector s a
- splitAt :: Prim a => Int -> MVector s a -> (MVector s a, MVector s a)
- unsafeSlice :: Prim a => Int -> Int -> MVector s a -> MVector s a
- unsafeInit :: Prim a => MVector s a -> MVector s a
- unsafeTail :: Prim a => MVector s a -> MVector s a
- unsafeTake :: Prim a => Int -> MVector s a -> MVector s a
- unsafeDrop :: Prim a => Int -> MVector s a -> MVector s a
- overlaps :: Prim a => MVector s a -> MVector s a -> Bool
- new :: (PrimMonad m, Prim a) => Int -> m (MVector (PrimState m) a)
- unsafeNew :: (PrimMonad m, Prim a) => Int -> m (MVector (PrimState m) a)
- replicate :: (PrimMonad m, Prim a) => Int -> a -> m (MVector (PrimState m) a)
- replicateM :: (PrimMonad m, Prim a) => Int -> m a -> m (MVector (PrimState m) a)
- clone :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> m (MVector (PrimState m) a)
- grow :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a)
- unsafeGrow :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a)
- clear :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> m ()
- read :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m a
- write :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> a -> m ()
- modify :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> (a -> a) -> Int -> m ()
- swap :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> Int -> m ()
- unsafeRead :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m a
- unsafeWrite :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> a -> m ()
- unsafeModify :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> (a -> a) -> Int -> m ()
- unsafeSwap :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> Int -> m ()
- nextPermutation :: (PrimMonad m, Ord e, Prim e) => MVector (PrimState m) e -> m Bool
- set :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> a -> m ()
- copy :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- move :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- unsafeCopy :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
- unsafeMove :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m ()
Mutable vectors of primitive types
Mutable vectors of primitive types.
Constructors
| MVector !Int !Int !(MutableByteArray s) | offset, length, underlying mutable byte array |
Instances
Class of types supporting primitive array operations. This includes
interfacing with GC-managed memory (functions suffixed with ByteArray#)
and interfacing with unmanaged memory (functions suffixed with Addr#).
Endianness is platform-dependent.
Minimal complete definition
sizeOf#, alignment#, indexByteArray#, readByteArray#, writeByteArray#, setByteArray#, indexOffAddr#, readOffAddr#, writeOffAddr#, setOffAddr#
Instances
Accessors
Length information
Extracting subvectors
Yield a part of the mutable vector without copying it. The vector must
contain at least i+n elements.
Yield a part of the mutable vector without copying it. No bounds checks are performed.
Overlapping
Construction
Initialisation
new :: (PrimMonad m, Prim a) => Int -> m (MVector (PrimState m) a) Source #
Create a mutable vector of the given length.
unsafeNew :: (PrimMonad m, Prim a) => Int -> m (MVector (PrimState m) a) Source #
Create a mutable vector of the given length. The vector content is uninitialized, which means it is filled with whatever underlying memory buffer happens to contain.
Since: 0.5
replicate :: (PrimMonad m, Prim 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, Prim 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, Prim a) => MVector (PrimState m) a -> m (MVector (PrimState m) a) Source #
Create a copy of a mutable vector.
Growing
grow :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) Source #
Grow a primitive vector by the given number of elements. The number must be
non-negative. Same semantics as in grow for generic vector.
Examples
>>>import qualified Data.Vector.Primitive as VP>>>import qualified Data.Vector.Primitive.Mutable as MVP>>>mv <- VP.thaw $ VP.fromList ([10, 20, 30] :: [Int])>>>mv' <- MVP.grow mv 2
Extra memory at the end of the newly allocated vector is initialized to 0
bytes, which for Prim instance will usually correspond to some default
value for a particular type, eg. 0 for Int, NUL for Char,
etc. However, if unsafeGrow was used instead this would not have been
guaranteed and some garbage would be there instead:
>>>VP.unsafeFreeze mv'[10,20,30,0,0]
Having the extra space we can write new values in there:
>>>MVP.write mv' 3 999>>>VP.unsafeFreeze mv'[10,20,30,999,0]
It is important to note that the source mutable vector is not affected when the newly allocated one is mutated.
>>>MVP.write mv' 2 888>>>VP.unsafeFreeze mv'[10,20,888,999,0]>>>VP.unsafeFreeze mv[10,20,30]
Since: 0.5
unsafeGrow :: (PrimMonad m, Prim 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 non-negative but
this is not checked. Same semantics as in unsafeGrow for generic vector.
Since: 0.5
Restricting memory usage
clear :: (PrimMonad m, Prim 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, Prim a) => MVector (PrimState m) a -> Int -> m a Source #
Yield the element at the given position.
write :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> a -> m () Source #
Replace the element at the given position.
modify :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> (a -> a) -> Int -> m () Source #
Modify the element at the given position.
swap :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> Int -> m () Source #
Swap the elements at the given positions.
unsafeRead :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m a Source #
Yield the element at the given position. No bounds checks are performed.
unsafeWrite :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> a -> m () Source #
Replace the element at the given position. No bounds checks are performed.
unsafeModify :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> (a -> a) -> Int -> m () Source #
Modify the element at the given position. No bounds checks are performed.
unsafeSwap :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> Int -> m () Source #
Swap the elements at the given positions. No bounds checks are performed.
Modifying vectors
nextPermutation :: (PrimMonad m, Ord e, Prim e) => MVector (PrimState m) e -> m Bool Source #
Compute the next (lexicographically) permutation of given vector in-place. Returns False when input is the last permutation
Filling and copying
set :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> a -> m () Source #
Set all elements of the vector to the given value.
Arguments
| :: (PrimMonad m, Prim 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.
Arguments
| :: (PrimMonad m, Prim 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.
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.
Arguments
| :: (PrimMonad m, Prim 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.
Arguments
| :: (PrimMonad m, Prim 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.