pub enum StyleStructRef<'a, T: 'static> {
    Borrowed(&'a T),
    Owned(UniqueArc<T>),
    Vacated,
}
Expand description

A reference to a style struct of the parent, or our own style struct.

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Borrowed(&'a T)

A borrowed struct from the parent, for example, for inheriting style.

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Owned(UniqueArc<T>)

An owned struct, that we’ve already mutated.

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Vacated

Temporarily vacated, will panic if accessed

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impl<'a, T> StyleStructRef<'a, T>
where T: Clone + 'a,

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pub fn mutate(&mut self) -> &mut T

Ensure a mutable reference of this value exists, either cloning the borrowed value, or returning the owned one.

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pub fn ptr_eq(&self, struct_to_copy_from: &T) -> bool

Whether this is pointer-equal to the struct we’re going to copy the value from.

This is used to avoid allocations when people write stuff like font: inherit or such all: initial.

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pub fn take(&mut self) -> UniqueArc<T>

Extract a unique Arc from this struct, vacating it.

The vacated state is a transient one, please put the Arc back when done via put(). This function is to be used to separate the struct being mutated from the computed context

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pub fn put(&mut self, arc: UniqueArc<T>)

Replace vacated ref with an arc

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pub fn get_if_mutated(&mut self) -> Option<&mut T>

Get a mutable reference to the owned struct, or None if the struct hasn’t been mutated.

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pub fn build(self) -> Arc<T>

Returns an Arc to the internal struct, constructing one if appropriate.

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impl<'a, T: 'a> Deref for StyleStructRef<'a, T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &T

Dereferences the value.

Auto Trait Implementations§

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impl<'a, T> Freeze for StyleStructRef<'a, T>

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impl<'a, T> RefUnwindSafe for StyleStructRef<'a, T>
where T: RefUnwindSafe,

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impl<'a, T> Send for StyleStructRef<'a, T>
where T: Sync + Send,

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impl<'a, T> Sync for StyleStructRef<'a, T>
where T: Sync + Send,

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impl<'a, T> Unpin for StyleStructRef<'a, T>
where T: Unpin,

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impl<'a, T> UnwindSafe for StyleStructRef<'a, T>

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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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<T> Same for T

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type Output = T

Should always be Self
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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> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T