Type Alias NotThreadSafe

pub type NotThreadSafe = PhantomData<*mut ()>;

Zero-sized type to mark types not Send.

Add this type as a field to your struct if your type should not be sent to a different task. Since Send is an auto trait, adding a single field that is !Send will ensure that the whole type is !Send.

If a type is !Send it is impossible to give control over an instance of the type to another task. This is useful to include in types that store or reference task-local information. A file descriptor is an example of such task-local information.

This type also makes the type !Sync, which prevents immutable access to the value from several threads in parallel.

Aliased Type

struct NotThreadSafe;

Trait Implementations

impl<T> Clone for PhantomData<T>

where T: ?Sized,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for PhantomData<T>

where T: ?Sized,

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

Formats the value using the given formatter.

impl<T> Default for PhantomData<T>

where T: ?Sized,

fn default() -> PhantomData<T>

Returns the “default value” for a type.

impl<T> Hash for PhantomData<T>

where T: ?Sized,

fn hash<H>(&self, _: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> Ord for PhantomData<T>

where T: ?Sized,

fn cmp(&self, _other: &PhantomData<T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T> PartialEq for PhantomData<T>

where T: ?Sized,

fn eq(&self, _other: &PhantomData<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<T> PartialOrd for PhantomData<T>

where T: ?Sized,

fn partial_cmp(&self, _other: &PhantomData<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T> Copy for PhantomData<T>

where T: ?Sized,

impl<T> Eq for PhantomData<T>

where T: ?Sized,

impl<T> Freeze for PhantomData<T>

where T: ?Sized,

impl<T> StructuralPartialEq for PhantomData<T>

where T: ?Sized,

impl<T: ?Sized> Zeroable for PhantomData<T>