Struct AutoChild 

pub struct AutoChild<T> { /* private fields */ }

Implementations

impl<T> AutoChild<T>

pub fn new(child: T) -> Self

Methods from Deref<Target = Pin<Box<RawAutoChild<T>>>>

pub fn as_ref(&self) -> Pin<&<Ptr as Deref>::Target>

where Ptr: Deref,

Gets a shared reference to the pinned value this Pin points to.

This is a generic method to go from &Pin<Pointer<T>> to Pin<&T>. It is safe because, as part of the contract of Pin::new_unchecked, the pointee cannot move after Pin<Pointer<T>> got created. “Malicious” implementations of Pointer::Deref are likewise ruled out by the contract of Pin::new_unchecked.

pub fn as_mut(&mut self) -> Pin<&mut <Ptr as Deref>::Target>

where Ptr: DerefMut,

Gets a mutable reference to the pinned value this Pin<Ptr> points to.

This is a generic method to go from &mut Pin<Pointer<T>> to Pin<&mut T>. It is safe because, as part of the contract of Pin::new_unchecked, the pointee cannot move after Pin<Pointer<T>> got created. “Malicious” implementations of Pointer::DerefMut are likewise ruled out by the contract of Pin::new_unchecked.

This method is useful when doing multiple calls to functions that consume the pinning pointer.

Example

use std::pin::Pin;

impl Type {
    fn method(self: Pin<&mut Self>) {
        // do something
    }

    fn call_method_twice(mut self: Pin<&mut Self>) {
        // `method` consumes `self`, so reborrow the `Pin<&mut Self>` via `as_mut`.
        self.as_mut().method();
        self.as_mut().method();
    }
}

pub fn as_deref_mut( self: Pin<&mut Pin<Ptr>>, ) -> Pin<&mut <Ptr as Deref>::Target>

where Ptr: DerefMut,

Gets Pin<&mut T> to the underlying pinned value from this nested Pin-pointer.

This is a generic method to go from Pin<&mut Pin<Pointer<T>>> to Pin<&mut T>. It is safe because the existence of a Pin<Pointer<T>> ensures that the pointee, T, cannot move in the future, and this method does not enable the pointee to move. “Malicious” implementations of Ptr::DerefMut are likewise ruled out by the contract of Pin::new_unchecked.

pub fn set(&mut self, value: <Ptr as Deref>::Target)

where <Ptr as Deref>::Target: Sized,

Assigns a new value to the memory location pointed to by the Pin<Ptr>.

This overwrites pinned data, but that is okay: the original pinned value’s destructor gets run before being overwritten and the new value is also a valid value of the same type, so no pinning invariant is violated. See the pin module documentation for more information on how this upholds the pinning invariants.

Example

use std::pin::Pin;

let mut val: u8 = 5;
let mut pinned: Pin<&mut u8> = Pin::new(&mut val);
println!("{}", pinned); // 5
pinned.set(10);
println!("{}", pinned); // 10

Trait Implementations

impl<T: Debug> Debug for AutoChild<T>

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

Formats the value using the given formatter.

impl<T> Deref for AutoChild<T>

type Target = Pin<Box<RawAutoChild<T>>>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T> DerefMut for AutoChild<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T> Drop for AutoChild<T>

fn drop(&mut self)

Executes the destructor for this type.