Struct ArcBorrow

pub struct ArcBorrow<'a, T: 'a>(/* private fields */);

A “borrowed Arc”. This is a pointer to a T that is known to have been allocated within an Arc.

This is equivalent in guarantees to &Arc<T>, however it is a bit more flexible. To obtain an &Arc<T> you must have an Arc instance somewhere pinned down until we’re done with it.

However, Gecko hands us refcounted things as pointers to T directly, so we have to conjure up a temporary Arc on the stack each time. The same happens for when the object is managed by a RawOffsetArc.

ArcBorrow lets us deal with borrows of known-refcounted objects without needing to worry about how they’re actually stored.

Implementations

impl<'a, T> ArcBorrow<'a, T>

pub fn clone_arc(&self) -> Arc<T>

pub unsafe fn from_ref(r: &'a T) -> Self

For constructing from a reference known to be Arc-backed, e.g. if we obtain such a reference over FFI

pub fn with_arc<F, U>(&self, f: F) -> U

where F: FnOnce(&Arc<T>) -> U, T: 'static,

Trait Implementations

impl<'a, T> Clone for ArcBorrow<'a, T>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a, T> Deref for ArcBorrow<'a, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<'a, T: PartialEq + 'a> PartialEq for ArcBorrow<'a, T>

fn eq(&self, other: &ArcBorrow<'a, 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<'a, T> Copy for ArcBorrow<'a, T>

impl<'a, T: Eq + 'a> Eq for ArcBorrow<'a, T>

impl<'a, T: 'a> StructuralPartialEq for ArcBorrow<'a, T>