[][src]Struct rustc_data_structures::owning_ref::OwningRef

pub struct OwningRef<O, T: ?Sized> {
    owner: O,
    reference: *const T,
}
⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

An owning reference.

This wraps an owner O and a reference &T pointing at something reachable from O::Target while keeping the ability to move self around.

The owner is usually a pointer that points at some base type.

For more details and examples, see the module and method docs.

Fields

owner: O
⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

reference: *const T
⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Methods

impl<O, T: ?Sized> OwningRef<O, T>[src]

pub fn new(o: O) -> Self where
    O: StableAddress,
    O: Deref<Target = T>, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Creates a new owning reference from a owner initialized to the direct dereference of it.

Example

extern crate owning_ref;
use owning_ref::OwningRef;

fn main() {
    let owning_ref = OwningRef::new(Box::new(42));
    assert_eq!(*owning_ref, 42);
}

pub unsafe fn new_assert_stable_address(o: O) -> Self where
    O: Deref<Target = T>, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Like new, but doesn’t require O to implement the StableAddress trait. Instead, the caller is responsible to make the same promises as implementing the trait.

This is useful for cases where coherence rules prevents implementing the trait without adding a dependency to this crate in a third-party library.

pub fn map<F, U: ?Sized>(self, f: F) -> OwningRef<O, U> where
    O: StableAddress,
    F: FnOnce(&T) -> &U, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Converts self into a new owning reference that points at something reachable from the previous one.

This can be a reference to a field of U, something reachable from a field of U, or even something unrelated with a 'static lifetime.

Example

extern crate owning_ref;
use owning_ref::OwningRef;

fn main() {
    let owning_ref = OwningRef::new(Box::new([1, 2, 3, 4]));

    // create a owning reference that points at the
    // third element of the array.
    let owning_ref = owning_ref.map(|array| &array[2]);
    assert_eq!(*owning_ref, 3);
}

pub fn try_map<F, U: ?Sized, E>(self, f: F) -> Result<OwningRef<O, U>, E> where
    O: StableAddress,
    F: FnOnce(&T) -> Result<&U, E>, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Tries to convert self into a new owning reference that points at something reachable from the previous one.

This can be a reference to a field of U, something reachable from a field of U, or even something unrelated with a 'static lifetime.

Example

extern crate owning_ref;
use owning_ref::OwningRef;

fn main() {
    let owning_ref = OwningRef::new(Box::new([1, 2, 3, 4]));

    // create a owning reference that points at the
    // third element of the array.
    let owning_ref = owning_ref.try_map(|array| {
        if array[2] == 3 { Ok(&array[2]) } else { Err(()) }
    });
    assert_eq!(*owning_ref.unwrap(), 3);
}

pub unsafe fn map_owner<F, P>(self, f: F) -> OwningRef<P, T> where
    O: StableAddress,
    P: StableAddress,
    F: FnOnce(O) -> P, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Converts self into a new owning reference with a different owner type.

The new owner type needs to still contain the original owner in some way so that the reference into it remains valid. This function is marked unsafe because the user needs to manually uphold this guarantee.

pub fn map_owner_box(self) -> OwningRef<Box<O>, T>[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Converts self into a new owning reference where the owner is wrapped in an additional Box<O>.

This can be used to safely erase the owner of any OwningRef<O, T> to a OwningRef<Box<Erased>, T>.

pub fn erase_owner<'a>(self) -> OwningRef<O::Erased, T> where
    O: IntoErased<'a>, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Erases the concrete base type of the owner with a trait object.

This allows mixing of owned references with different owner base types.

Example

extern crate owning_ref;
use owning_ref::{OwningRef, Erased};

fn main() {
    // N.B., using the concrete types here for explicitness.
    // For less verbose code type aliases like `BoxRef` are provided.

    let owning_ref_a: OwningRef<Box<[i32; 4]>, [i32; 4]>
        = OwningRef::new(Box::new([1, 2, 3, 4]));

    let owning_ref_b: OwningRef<Box<Vec<(i32, bool)>>, Vec<(i32, bool)>>
        = OwningRef::new(Box::new(vec![(0, false), (1, true)]));

    let owning_ref_a: OwningRef<Box<[i32; 4]>, i32>
        = owning_ref_a.map(|a| &a[0]);

    let owning_ref_b: OwningRef<Box<Vec<(i32, bool)>>, i32>
        = owning_ref_b.map(|a| &a[1].0);

    let owning_refs: [OwningRef<Box<Erased>, i32>; 2]
        = [owning_ref_a.erase_owner(), owning_ref_b.erase_owner()];

    assert_eq!(*owning_refs[0], 1);
    assert_eq!(*owning_refs[1], 1);
}

pub fn erase_send_owner<'a>(self) -> OwningRef<O::Erased, T> where
    O: IntoErasedSend<'a>, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Erases the concrete base type of the owner with a trait object which implements Send.

This allows mixing of owned references with different owner base types.

pub fn erase_send_sync_owner<'a>(self) -> OwningRef<O::Erased, T> where
    O: IntoErasedSendSync<'a>, 
[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Erases the concrete base type of the owner with a trait object which implements Send and Sync.

This allows mixing of owned references with different owner base types.

Important traits for &'_ mut I
pub fn owner(&self) -> &O[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

A getter for the underlying owner.

pub fn into_inner(self) -> O[src]

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Discards the reference and retrieves the owner.

Trait Implementations

impl<O, T: ?Sized> Send for OwningRef<O, T> where
    O: Send,
    &'a T: Send
[src]

impl<O, T: ?Sized> Sync for OwningRef<O, T> where
    O: Sync,
    &'a T: Sync
[src]

impl<O, T: ?Sized> AsRef<T> for OwningRef<O, T>[src]

impl<O, T: ?Sized> From<O> for OwningRef<O, T> where
    O: StableAddress,
    O: Deref<Target = T>, 
[src]

impl<O, T: ?Sized> From<OwningRefMut<O, T>> for OwningRef<O, T> where
    O: StableAddress,
    O: DerefMut<Target = T>, 
[src]

impl<O, T: ?Sized> Clone for OwningRef<O, T> where
    O: CloneStableAddress
[src]

impl<O, T: ?Sized> Eq for OwningRef<O, T> where
    T: Eq
[src]

impl<O, T: ?Sized> Ord for OwningRef<O, T> where
    T: Ord
[src]

impl<O, T: ?Sized> PartialEq<OwningRef<O, T>> for OwningRef<O, T> where
    T: PartialEq
[src]

impl<O, T: ?Sized> PartialOrd<OwningRef<O, T>> for OwningRef<O, T> where
    T: PartialOrd
[src]

impl<O, T: ?Sized> Deref for OwningRef<O, T>[src]

type Target = T

The resulting type after dereferencing.

impl<O, T: ?Sized> Debug for OwningRef<O, T> where
    O: Debug,
    T: Debug
[src]

impl<O, T: ?Sized> Hash for OwningRef<O, T> where
    T: Hash
[src]

impl<O, T: ?Sized> Borrow<T> for OwningRef<O, T>[src]

impl<O, T: ?Sized> StableDeref for OwningRef<O, T>[src]

impl<O, T: ?Sized> CloneStableDeref for OwningRef<O, T> where
    O: CloneStableAddress
[src]

Auto Trait Implementations

impl<O, T: ?Sized> Unpin for OwningRef<O, T> where
    O: Unpin

impl<O, T: ?Sized> UnwindSafe for OwningRef<O, T> where
    O: UnwindSafe,
    T: RefUnwindSafe

impl<O, T: ?Sized> RefUnwindSafe for OwningRef<O, T> where
    O: RefUnwindSafe,
    T: RefUnwindSafe

Blanket Implementations

impl<T> Erased for T[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = !

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<E> SpecializationError for E[src]

impl<Q, K> Equivalent<K> for Q where
    K: Borrow<Q> + ?Sized,
    Q: Eq + ?Sized
[src]