Struct polars::chunked_array::builder::AlignedVec

pub struct AlignedVec<T> { /* fields omitted */ }

A Vec wrapper with a memory alignment equal to Arrow's primitive arrays. Can be useful in creating a new ChunkedArray or Arrow Primitive array without copying.

Implementations

impl<T: Clone> AlignedVec<T>

pub fn resize(&mut self, new_len: usize, value: T)

pub fn extend_from_slice(&mut self, other: &[T])

impl<T> AlignedVec<T>

pub fn with_capacity_aligned(size: usize) -> Self

Create a new Vec where first bytes memory address has an alignment of 64 bytes, as described by arrow spec. Read more: https://github.com/rust-ndarray/ndarray/issues/771

pub fn is_empty(&self) -> bool

pub fn reserve(&mut self, additional: usize)

pub fn len(&self) -> usize

pub unsafe fn from_ptr(ptr: usize, len: usize, capacity: usize) -> Self

Create a new aligned vec from a ptr.

Safety

The ptr should be 64 byte aligned and len and capacity should be correct otherwise it is UB.

pub fn push(&mut self, value: T)

Push at the end of the Vec. This is unsafe because a push when the capacity of the inner Vec is reached will reallocate the Vec without the alignment, leaving this destructor's alignment incorrect

pub unsafe fn set_len(&mut self, new_len: usize)

Set the length of the underlying Vec.

Safety

• new_len must be less than or equal to capacity.
• The elements at old_len..new_len must be initialized.

pub fn as_ptr(&self) -> *const T

pub fn as_mut_ptr(&mut self) -> *mut T

pub fn capacity(&self) -> usize

pub fn into_raw_parts(self) -> (*mut T, usize, usize)

pub fn shrink_to_fit(&mut self)

pub fn into_arrow_buffer(self) -> Buffer

Transform this array to an Arrow Buffer.

Trait Implementations

impl<T: Debug> Debug for AlignedVec<T>

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Drop for AlignedVec<T>

pub fn drop(&mut self)

Executes the destructor for this type.

impl<T> FromIterator<T> for AlignedVec<T>

pub fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self

Creates a value from an iterator.