pub struct DomRefCell<T> {
    value: RefCell<T>,
}
Expand description

A mutable field in the DOM.

This extends the API of std::cell::RefCell to allow unsafe access in certain situations, with dynamic checking in debug builds.

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§value: RefCell<T>

Implementations§

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impl<T> DomRefCell<T>

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pub unsafe fn borrow_for_layout(&self) -> &T

Return a reference to the contents.

For use in layout only.

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pub unsafe fn borrow_for_script_deallocation(&self) -> &mut T

Borrow the contents for the purpose of script deallocation.

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pub unsafe fn borrow_mut_for_layout(&self) -> &mut T

Mutably borrow a cell for layout. Ideally this would use RefCell::try_borrow_mut_unguarded but that doesn’t exist yet.

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impl<T> DomRefCell<T>

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pub fn new(value: T) -> DomRefCell<T>

Create a new DomRefCell containing value.

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pub fn borrow(&self) -> Ref<'_, T>

Immutably borrows the wrapped value.

The borrow lasts until the returned Ref exits scope. Multiple immutable borrows can be taken out at the same time.

§Panics

Panics if this is called off the script thread.

Panics if the value is currently mutably borrowed.

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pub fn borrow_mut(&self) -> RefMut<'_, T>

Mutably borrows the wrapped value.

The borrow lasts until the returned RefMut exits scope. The value cannot be borrowed while this borrow is active.

§Panics

Panics if this is called off the script thread.

Panics if the value is currently borrowed.

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pub fn try_borrow(&self) -> Result<Ref<'_, T>, BorrowError>

Attempts to immutably borrow the wrapped value.

The borrow lasts until the returned Ref exits scope. Multiple immutable borrows can be taken out at the same time.

Returns None if the value is currently mutably borrowed.

§Panics

Panics if this is called off the script thread.

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pub fn try_borrow_mut(&self) -> Result<RefMut<'_, T>, BorrowMutError>

Mutably borrows the wrapped value.

The borrow lasts until the returned RefMut exits scope. The value cannot be borrowed while this borrow is active.

Returns None if the value is currently borrowed.

§Panics

Panics if this is called off the script thread.

Trait Implementations§

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impl<T: Clone> Clone for DomRefCell<T>

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: CustomTraceable> CustomTraceable for DomRefCell<T>

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unsafe fn trace(&self, trc: *mut JSTracer)

Trace self.
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impl<T: Debug> Debug for DomRefCell<T>

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

Formats the value using the given formatter. Read more
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impl<T: Default> Default for DomRefCell<T>

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fn default() -> DomRefCell<T>

Returns the “default value” for a type. Read more
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impl<T> MallocSizeOf for DomRefCell<T>
where T: MallocSizeOf,

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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.
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impl<K, V> Maplike for DomRefCell<IndexMap<K, V>>

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type Key = K

The type of the key of the map.
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type Value = V

The type of the value of the map.
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fn get_index(&self, index: u32) -> Option<(Self::Key, Self::Value)>

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fn get(&self, key: Self::Key) -> Option<Self::Value>

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fn size(&self) -> u32

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fn set(&self, key: Self::Key, value: Self::Value)

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fn has(&self, key: Self::Key) -> bool

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fn clear(&self)

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fn delete(&self, key: Self::Key) -> bool

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impl<T: PartialEq> PartialEq for DomRefCell<T>

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<K> Setlike for DomRefCell<IndexSet<K>>

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type Key = K

The type of the key of the set.
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fn get_index(&self, index: u32) -> Option<Self::Key>

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fn size(&self) -> u32

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fn add(&self, key: Self::Key)

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fn has(&self, key: Self::Key) -> bool

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fn clear(&self)

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fn delete(&self, key: Self::Key) -> bool

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impl<T: JSTraceable> Traceable for DomRefCell<T>

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unsafe fn trace(&self, trc: *mut JSTracer)

Trace self.
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impl<T> StructuralPartialEq for DomRefCell<T>

Auto Trait Implementations§

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impl<T> !Freeze for DomRefCell<T>

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impl<T> !RefUnwindSafe for DomRefCell<T>

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impl<T> Send for DomRefCell<T>
where T: Send,

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impl<T> !Sync for DomRefCell<T>

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impl<T> Unpin for DomRefCell<T>
where T: Unpin,

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impl<T> UnwindSafe for DomRefCell<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> MaybeBoxed<Box<T>> for T

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fn maybe_boxed(self) -> Box<T>

Convert
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impl<T> MaybeBoxed<T> for T

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fn maybe_boxed(self) -> T

Convert
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<R, P> ReadPrimitive<R> for P
where R: Read + ReadEndian<P>, P: Default,

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fn read_from_little_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_little_endian().
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fn read_from_big_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_big_endian().
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fn read_from_native_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_native_endian().
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> Upcast<T> for T

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fn upcast(&self) -> Option<&T>

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

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impl<T> WasmNotSend for T
where T: Send,