Struct webrender::util::PrimaryArc

pub struct PrimaryArc<T>(pub Arc<T>);

Arc wrapper to support measurement via MallocSizeOf.

Memory reporting for Arcs is tricky because of the risk of double-counting. One way to measure them is to keep a table of pointers that have already been traversed. The other way is to use knowledge of the program structure to identify which Arc instances should be measured and which should be skipped to avoid double-counting.

This struct implements the second approach. It identifies the “main” pointer to the Arc-ed resource, and measures the buffer as if it were an owned pointer. The programmer should ensure that there is at most one PrimaryArc for a given underlying ArcInner.

Tuple Fields

0: Arc<T>

Trait Implementations

impl<T: Clone> Clone for PrimaryArc<T>

fn clone(&self) -> PrimaryArc<T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for PrimaryArc<T>

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

Formats the value using the given formatter.

impl<T: Hash> Hash for PrimaryArc<T>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> MallocShallowSizeOf for PrimaryArc<T>

fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of immediate heap-allocated descendant structures, but not the space taken up by the value itself. Anything beyond the immediate descendants must be measured separately, using iteration.

impl<T: MallocSizeOf> MallocSizeOf for PrimaryArc<T>

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl<T: PartialEq> PartialEq for PrimaryArc<T>

fn eq(&self, other: &PrimaryArc<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> Serialize for PrimaryArc<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> Deref for PrimaryArc<T>

type Target = Arc<T>

The resulting type after dereferencing.

fn deref(&self) -> &Arc<T>

Dereferences the value.

impl<T: Eq> Eq for PrimaryArc<T>

impl<T> StructuralPartialEq for PrimaryArc<T>