pub struct SyncUnsafeCell<T>where
T: ?Sized,{ /* private fields */ }🔬This is a nightly-only experimental API. (
sync_unsafe_cell)Available on crate feature
std only.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.
Implementations§
Source§impl<T> SyncUnsafeCell<T>
impl<T> SyncUnsafeCell<T>
Sourcepub const fn new(value: T) -> SyncUnsafeCell<T>
🔬This is a nightly-only experimental API. (sync_unsafe_cell)
pub const fn new(value: T) -> SyncUnsafeCell<T>
sync_unsafe_cell)Constructs a new instance of SyncUnsafeCell which will wrap the specified value.
Sourcepub const fn into_inner(self) -> T
🔬This is a nightly-only experimental API. (sync_unsafe_cell)
pub const fn into_inner(self) -> T
sync_unsafe_cell)Unwraps the value, consuming the cell.
Source§impl<T> SyncUnsafeCell<T>where
T: ?Sized,
impl<T> SyncUnsafeCell<T>where
T: ?Sized,
Sourcepub const fn get(&self) -> *mut T
🔬This is a nightly-only experimental API. (sync_unsafe_cell)
pub const fn get(&self) -> *mut T
sync_unsafe_cell)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
Sourcepub const fn get_mut(&mut self) -> &mut T
🔬This is a nightly-only experimental API. (sync_unsafe_cell)
pub const fn get_mut(&mut self) -> &mut T
sync_unsafe_cell)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.
Sourcepub const fn raw_get(this: *const SyncUnsafeCell<T>) -> *mut T
🔬This is a nightly-only experimental API. (sync_unsafe_cell)
pub const fn raw_get(this: *const SyncUnsafeCell<T>) -> *mut T
sync_unsafe_cell)Gets a mutable pointer to the wrapped value.
See UnsafeCell::get for details.
Trait Implementations§
Source§impl<T> Debug for SyncUnsafeCell<T>where
T: ?Sized,
impl<T> Debug for SyncUnsafeCell<T>where
T: ?Sized,
Source§impl<T> Default for SyncUnsafeCell<T>where
T: Default,
impl<T> Default for SyncUnsafeCell<T>where
T: Default,
Source§fn default() -> SyncUnsafeCell<T>
fn default() -> SyncUnsafeCell<T>
Creates an SyncUnsafeCell, with the Default value for T.
Source§impl<T> From<T> for SyncUnsafeCell<T>
impl<T> From<T> for SyncUnsafeCell<T>
Source§fn from(t: T) -> SyncUnsafeCell<T>
fn from(t: T) -> SyncUnsafeCell<T>
Creates a new SyncUnsafeCell<T> containing the given value.
impl<T, U> CoerceUnsized<SyncUnsafeCell<U>> for SyncUnsafeCell<T>where
T: CoerceUnsized<U>,
impl<T, U> DispatchFromDyn<SyncUnsafeCell<U>> for SyncUnsafeCell<T>where
T: DispatchFromDyn<U>,
impl<T> PinCoerceUnsized for SyncUnsafeCell<T>where
T: ?Sized,
impl<T> PointerLike for SyncUnsafeCell<T>where
T: PointerLike,
impl<T> Sync for SyncUnsafeCell<T>
Auto Trait Implementations§
impl<T> !Freeze for SyncUnsafeCell<T>
impl<T> !RefUnwindSafe for SyncUnsafeCell<T>
impl<T> Send for SyncUnsafeCell<T>
impl<T> Unpin for SyncUnsafeCell<T>
impl<T> UnwindSafe for SyncUnsafeCell<T>where
T: UnwindSafe + ?Sized,
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§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
The archived version of the pointer metadata for this type.
§fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata,
) -> <T as Pointee>::Metadata
fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata, ) -> <T as Pointee>::Metadata
Converts some archived metadata to the pointer metadata for itself.
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
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Mutably borrows from an owned value. Read more
Source§impl<T> ByteSized for T
impl<T> ByteSized for T
Source§const BYTE_ALIGN: usize = _
const BYTE_ALIGN: usize = _
The alignment of this type in bytes.
Source§fn byte_align(&self) -> usize ⓘ
fn byte_align(&self) -> usize ⓘ
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impl<T> ExtMem for Twhere
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Source§const NEEDS_DROP: bool = _
const NEEDS_DROP: bool = _
Know whether dropping values of this type matters, in compile-time.
Source§fn mem_align_of<T>() -> usize ⓘ
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fn mem_align_of_val(&self) -> usize ⓘ
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fn mem_size_of_val(&self) -> usize ⓘ
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Source§fn mem_needs_drop(&self) -> bool
fn mem_needs_drop(&self) -> bool
Returns
true if dropping values of this type matters. Read moreSource§fn mem_forget(self)where
Self: Sized,
fn mem_forget(self)where
Self: Sized,
Forgets about
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Self: Sized,
Source§unsafe fn mem_zeroed<T>() -> T
unsafe fn mem_zeroed<T>() -> T
Available on crate feature
unsafe_layout only.Returns the value of type
T represented by the all-zero byte-pattern. Read moreSource§unsafe fn mem_transmute_copy<Src, Dst>(src: &Src) -> Dst
unsafe fn mem_transmute_copy<Src, Dst>(src: &Src) -> Dst
Available on crate feature
unsafe_layout only.Returns the value of type
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Available on crate feature
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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ
Converts
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§impl<T, N1, N2> Niching<NichedOption<T, N1>> for N2
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§unsafe fn is_niched(niched: *const NichedOption<T, N1>) -> bool
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