Union rustix::event::epoll::EventData

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#[repr(C)]
pub union EventData {
    as_u64: u64,
    sixty_four_bit_pointer: SixtyFourBitPointer,
}
Expand description

Data associated with an epoll::Event. This can either be a 64-bit integer value or a pointer which preserves pointer provenance.

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§as_u64: u64

A 64-bit integer value.

§sixty_four_bit_pointer: SixtyFourBitPointer

A *mut c_void which preserves pointer provenance, extended to be 64-bit so that if we read the value as a u64 union field, we don’t get uninitialized memory.

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impl EventData

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pub const fn new_u64(value: u64) -> Self

Construct a new value containing a u64.

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pub const fn new_ptr(value: *mut c_void) -> Self

Construct a new value containing a *mut c_void.

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pub fn u64(self) -> u64

Return the value as a u64.

If the stored value was a pointer, the pointer is zero-extended to a u64.

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pub fn ptr(self) -> *mut c_void

Return the value as a *mut c_void.

If the stored value was a u64, the least-significant bits of the u64 are returned as a pointer value.

Trait Implementations§

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impl Clone for EventData

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fn clone(&self) -> EventData

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 Hash for EventData

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for EventData

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fn eq(&self, other: &Self) -> 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 Copy for EventData

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impl Eq for EventData

Auto Trait Implementations§

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> 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> 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.