Struct std::cell::SyncUnsafeCell

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pub struct SyncUnsafeCell<T>where
T: ?Sized,
{ /* private fields */ }
🔬This is a nightly-only experimental API. (sync_unsafe_cell #95439)
Expand description

UnsafeCell, but Sync.

This is just an UnsafeCell, except it implements Sync if T implements Sync.

UnsafeCell doesn’t implement Sync, to prevent accidental mis-use. You can use SyncUnsafeCell instead of UnsafeCell to allow it to be shared between threads, if that’s intentional. Providing proper synchronization is still the task of the user, making this type just as unsafe to use.

See UnsafeCell for details.

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impl<T> SyncUnsafeCell<T>

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pub const fn new(value: T) -> SyncUnsafeCell<T>

🔬This is a nightly-only experimental API. (sync_unsafe_cell #95439)

Constructs a new instance of SyncUnsafeCell which will wrap the specified value.

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pub const fn into_inner(self) -> T

🔬This is a nightly-only experimental API. (sync_unsafe_cell #95439)

Unwraps the value.

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impl<T> SyncUnsafeCell<T>where
T: ?Sized,

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pub const fn get(&self) -> *mut T

🔬This is a nightly-only experimental API. (sync_unsafe_cell #95439)

Gets a mutable pointer to the wrapped value.

This can be cast to a pointer of any kind. Ensure that the access is unique (no active references, mutable or not) when casting to &mut T, and ensure that there are no mutations or mutable aliases going on when casting to &T

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pub const fn get_mut(&mut self) -> &mut T

🔬This is a nightly-only experimental API. (sync_unsafe_cell #95439)

Returns a mutable reference to the underlying data.

This call borrows the SyncUnsafeCell mutably (at compile-time) which guarantees that we possess the only reference.

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pub const fn raw_get(this: *const SyncUnsafeCell<T>) -> *mut T

🔬This is a nightly-only experimental API. (sync_unsafe_cell #95439)

Gets a mutable pointer to the wrapped value.

See UnsafeCell::get for details.

Trait Implementations§

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impl<T> Debug for SyncUnsafeCell<T>where
T: ?Sized,

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

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

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fn default() -> SyncUnsafeCell<T>

Creates an SyncUnsafeCell, with the Default value for T.

const: unstable · source§

impl<T> From<T> for SyncUnsafeCell<T>

const: unstable · source§

fn from(t: T) -> SyncUnsafeCell<T>

Creates a new SyncUnsafeCell<T> containing the given value.

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impl<T, U> CoerceUnsized<SyncUnsafeCell<U>> for SyncUnsafeCell<T>where
T: CoerceUnsized<U>,

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impl<T, U> DispatchFromDyn<SyncUnsafeCell<U>> for SyncUnsafeCell<T>where
T: DispatchFromDyn<U>,

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impl<T> Sync for SyncUnsafeCell<T>where
T: Sync + ?Sized,

Auto Trait Implementations§

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impl<T> !RefUnwindSafe for SyncUnsafeCell<T>

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impl<T: ?Sized> Send for SyncUnsafeCell<T>where
T: Send,

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impl<T: ?Sized> Unpin for SyncUnsafeCell<T>where
T: Unpin,

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impl<T: ?Sized> UnwindSafe for SyncUnsafeCell<T>where
T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere
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 Twhere
T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

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

const: unstable · source§

fn from(t: !) -> T

Converts to this type from the input type.
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
U: From<T>,

const: unstable · source§

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, U> TryFrom<U> for Twhere
U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere
U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.