Struct typesize::ptr::SizableArc

pub struct SizableArc<T, SC: ShouldCountInner>(pub Arc<T>, _);

A wrapper around Arc to implement TypeSize by allowing you to decide if to count the inner T’s size.

Examples

let arc = Arc::new(0);
let arc_borrow: SizableArc<u8, Borrowed> = arc.clone().into();
let arc_owner: SizableArc<u8, Owned> = arc.into();

// Just counts the pointer to the internal `ArcBox`.
assert_eq!(arc_borrow.get_size(), 0_usize.get_size());
// Counts the pointer to the `ArcBox`, plus the two AtomicUsize, and the value.
assert_eq!(arc_owner.get_size(), 0_usize.get_size() + (std::mem::size_of::<usize>() * 2) + 0_u8.get_size());

Tuple Fields

0: Arc<T>

Trait Implementations

impl<T, SC: ShouldCountInner> Deref for SizableArc<T, SC>

type Target = Arc<T>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T, SC: ShouldCountInner> From<Arc<T>> for SizableArc<T, SC>

fn from(value: Arc<T>) -> Self

Converts to this type from the input type.

impl<T> TypeSize for SizableArc<T, Borrowed>

fn extra_size(&self) -> usize

The number of bytes more than the std::mem::size_of that this value is using.

fn get_size(&self) -> usize

The total number of bytes that this type is using, both direct (std::mem::size_of) and indirect (behind allocations)

impl<T: TypeSize> TypeSize for SizableArc<T, Owned>

fn extra_size(&self) -> usize

The number of bytes more than the std::mem::size_of that this value is using.

fn get_size(&self) -> usize

The total number of bytes that this type is using, both direct (std::mem::size_of) and indirect (behind allocations)