Streamly.Internal.Data.MutArray.Generic

Definition:

>>> nil = MutArray.emptyOf 0

emptyOf count allocates a zero length array that can be extended to hold up to count items without reallocating.

Pre-release

Like createOf but does not check the array bounds when writing. The fold driver must not call the step function more than n times otherwise it will corrupt the memory and crash. This function exists mainly because any conditional in the step function blocks fusion causing 10x performance slowdown.

Pre-release

createOf n folds a maximum of n elements from the input stream to an Array.

>>> createOf n = Fold.take n (MutArray.unsafeCreateOf n)

Pre-release

createWith minCount folds the whole input to a single array. The array starts at a size big enough to hold minCount elements, the size is doubled every time the array needs to be grown.

Caution! Do not use this on infinite streams.

Pre-release

Fold the whole input to a single array.

Same as createWith using an initial array size of arrayChunkSize bytes rounded up to the element size.

Caution! Do not use this on infinite streams.

Create a MutArray from the first n elements of a stream. The array is allocated to size n, if the stream terminates before n elements then the array may hold less than n elements.

Reallocates the array according to the new size. This is a safe function that always creates a new array and copies the old array into the new one. If the reallocated size is less than the original array it results in a truncated version of the original array.

Make the uninitialized memory in the array available for use extending it by the supplied length beyond the current length of the array. The array may be reallocated.

snocWith sizer arr elem mutates arr to append elem. The length of the array increases by 1.

If there is no reserved space available in arr it is reallocated to a size in bytes determined by the sizer oldSize function, where oldSize is the original size of the array.

Note that the returned array may be a mutated version of the original array.

Pre-release

The array is mutated to append an additional element to it. If there is no reserved space available in the array then it is reallocated to double the original size.

This is useful to reduce allocations when appending unknown number of elements.

Note that the returned array may be a mutated version of the original array.

>>> snoc = MutArray.snocWith (* 2)

Performs O(n * log n) copies to grow, but is liberal with memory allocation.

Pre-release

Really really unsafe, appends the element into the first array, may cause silent data corruption or if you are lucky a segfault if the index is out of bounds.

Internal

Unfold an array into a stream.

Resumable unfold of an array.

Resumable unfold of an array.

Generates a stream from the elements of a MutArray.

>>> read = Stream.unfold MutArray.reader

Convert an Array into a list.

Pre-release

O(1) Lookup the element at the given index. Index starts from 0.

Return the element at the specified index without checking the bounds.

Unsafe because it does not check the bounds of the array.

Return the element at the specified index without checking the bounds from a MutableArray# RealWorld.

Unsafe because it does not check the bounds of the array.

chunksOf n stream groups the input stream into a stream of arrays of size n.

chunksOf n = foldMany (MutArray.writeN n)

Pre-release

O(1) Slice an array in constant time.

Unsafe: The bounds of the slice are not checked.

Unsafe

Pre-release

O(1) Slice an array in constant time. Throws an error if the slice extends out of the array bounds.

Pre-release

Put a sub range of a source array into a subrange of a destination array. This is not safe as it does not check the bounds.