Struct Owned

pub struct Owned<T>
where
    T: Pointable + ?Sized,
{ /* private fields */ }

An owned heap-allocated object.

This type is very similar to Box<T>.

The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused least significant bits of the address.

Implementations

impl<T> Owned<T>

pub unsafe fn from_raw(raw: *mut T) -> Owned<T>

Returns a new owned pointer pointing to raw.

This function is unsafe because improper use may lead to memory problems. Argument raw must be a valid pointer. Also, a double-free may occur if the function is called twice on the same raw pointer.

Panics

Panics if raw is not properly aligned.

Safety

The given raw should have been derived from Owned, and one raw should not be converted back by Owned::from_raw() multiple times.

Examples

use crossbeam_epoch::Owned;

let o = unsafe { Owned::from_raw(Box::into_raw(Box::new(1234))) };

pub fn into_box(self) -> Box<T>

Converts the owned pointer into a Box.

Examples

use crossbeam_epoch::Owned;

let o = Owned::new(1234);
let b: Box<i32> = o.into_box();
assert_eq!(*b, 1234);

pub fn new(init: T) -> Owned<T>

Allocates value on the heap and returns a new owned pointer pointing to it.

Examples

use crossbeam_epoch::Owned;

let o = Owned::new(1234);

impl<T> Owned<T>

where T: Pointable + ?Sized,

pub fn init(init: <T as Pointable>::Init) -> Owned<T>

Allocates value on the heap and returns a new owned pointer pointing to it.

Examples

use crossbeam_epoch::Owned;

let o = Owned::<i32>::init(1234);

pub fn into_shared<'g>(self, _: &'g Guard) -> Shared<'g, T>

Converts the owned pointer into a Shared.

Examples

use crossbeam_epoch::{self as epoch, Owned};

let o = Owned::new(1234);
let guard = &epoch::pin();
let p = o.into_shared(guard);

pub fn tag(&self) -> usize

Returns the tag stored within the pointer.

Examples

use crossbeam_epoch::Owned;

assert_eq!(Owned::new(1234).tag(), 0);

pub fn with_tag(self, tag: usize) -> Owned<T>

Returns the same pointer, but tagged with tag. tag is truncated to be fit into the unused bits of the pointer to T.

Examples

use crossbeam_epoch::Owned;

let o = Owned::new(0u64);
assert_eq!(o.tag(), 0);
let o = o.with_tag(2);
assert_eq!(o.tag(), 2);

Trait Implementations

impl<T> AsMut<T> for Owned<T>

where T: Pointable + ?Sized,

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

Converts this type into a mutable reference of the (usually inferred) input type.

impl<T> AsRef<T> for Owned<T>

where T: Pointable + ?Sized,

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.

impl<T> Borrow<T> for Owned<T>

where T: Pointable + ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value.

impl<T> BorrowMut<T> for Owned<T>

where T: Pointable + ?Sized,

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

Mutably borrows from an owned value.

impl<T> Clone for Owned<T>

where T: Clone,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Owned<T>

where T: Pointable + ?Sized,

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

Formats the value using the given formatter.

impl<T> Deref for Owned<T>

where T: Pointable + ?Sized,

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for Owned<T>

where T: Pointable + ?Sized,

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

Mutably dereferences the value.

impl<T> Drop for Owned<T>

where T: Pointable + ?Sized,

fn drop(&mut self)

Executes the destructor for this type.

impl<T> From<Box<T>> for Owned<T>

fn from(b: Box<T>) -> Owned<T>

Returns a new owned pointer pointing to b.

Panics

Panics if the pointer (the Box) is not properly aligned.

Examples

use crossbeam_epoch::Owned;

let o = unsafe { Owned::from_raw(Box::into_raw(Box::new(1234))) };

impl<T> From<Owned<T>> for Atomic<T>

where T: Pointable + ?Sized,

fn from(owned: Owned<T>) -> Atomic<T>

Returns a new atomic pointer pointing to owned.

Examples

use crossbeam_epoch::{Atomic, Owned};

let a = Atomic::<i32>::from(Owned::new(1234));

impl<T> From<T> for Owned<T>

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

Converts to this type from the input type.

impl<T> Pointer<T> for Owned<T>

where T: Pointable + ?Sized,

unsafe fn from_usize(data: usize) -> Owned<T>

Returns a new pointer pointing to the tagged pointer data.

Panics

Panics if the data is zero in debug mode.

fn into_usize(self) -> usize

Returns the machine representation of the pointer.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes