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Data.Vector.Storable.Mutable | Portability | non-portable | Stability | experimental | Maintainer | Roman Leshchinskiy <rl@cse.unsw.edu.au> |
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Description |
Mutable vectors based on Storable.
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Synopsis |
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data MVector s a = MVector !(Ptr a) !Int !(ForeignPtr a) | | type IOVector = MVector RealWorld | | type STVector s = MVector s | | class Storable a | | length :: Storable a => MVector s a -> Int | | overlaps :: Storable a => MVector s a -> MVector s a -> Bool | | slice :: Storable a => Int -> Int -> MVector s a -> MVector s a | | new :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a) | | newWith :: (PrimMonad m, Storable a) => Int -> a -> m (MVector (PrimState m) a) | | 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 () | | clear :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> 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 () | | grow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) | | unsafeSlice :: Storable a => Int -> Int -> MVector s a -> MVector s a | | unsafeNew :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a) | | unsafeNewWith :: (PrimMonad m, Storable a) => Int -> a -> m (MVector (PrimState m) a) | | 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 () | | unsafeCopy :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m () | | unsafeGrow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) | | unsafeFromForeignPtr :: Storable a => ForeignPtr a -> Int -> Int -> MVector s a | | unsafeToForeignPtr :: Storable a => MVector s a -> (ForeignPtr a, Int, Int) | | unsafeWith :: Storable a => IOVector a -> (Ptr a -> IO b) -> IO b |
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Mutable vectors of Storable types
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Mutable Storable-based vectors
| Constructors | |
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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.
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Operations on mutable vectors
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Length of the mutable vector.
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Yield a part of the mutable vector without copying it.
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Create a mutable vector of the given length.
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Create a mutable vector of the given length and fill it with an
initial value.
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Yield the element at the given position.
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Replace the element at the given position.
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Swap the elements at the given positions.
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Reset all elements of the vector to some undefined value, clearing all
references to external objects. This is usually a noop for unboxed vectors.
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Set all elements of the vector to the given value.
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Copy a vector. The two vectors must have the same length and may not
overlap.
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Grow a vector by the given number of elements. The number must be
positive.
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Unsafe operations
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:: Storable a | | => Int | length of the slice
| -> Int | | -> MVector s a | | -> MVector s a | | Yield a part of the mutable vector without copying it. No bounds checks
are performed.
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Create a mutable vector of the given length. The length is not checked.
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Create a mutable vector of the given length and fill it with an
initial value. The length is not checked.
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Yield the element at the given position. No bounds checks are performed.
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Replace the element at the given position. No bounds checks are performed.
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Swap the elements at the given positions. No bounds checks are performed.
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Grow a vector by the given number of elements. The number must be
positive but this is not checked.
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Accessing the underlying memory
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:: Storable a | | => ForeignPtr a | offset
| -> Int | length
| -> Int | | -> 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.
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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.
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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.
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Produced by Haddock version 2.6.0 |