[][src]Struct rustc_data_structures::owning_ref::OwningHandle

pub struct OwningHandle<O, H> where
    O: StableAddress,
    H: Deref
{ handle: H, _owner: O, }
🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

OwningHandle is a complement to OwningRef. Where OwningRef allows consumers to pass around an owned object and a dependent reference, OwningHandle contains an owned object and a dependent object.

OwningHandle can encapsulate a RefMut along with its associated RefCell, or an RwLockReadGuard along with its associated RwLock. However, the API is completely generic and there are no restrictions on what types of owning and dependent objects may be used.

OwningHandle is created by passing an owner object (which dereferences to a stable address) along with a callback which receives a pointer to that stable location. The callback may then dereference the pointer and mint a dependent object, with the guarantee that the returned object will not outlive the referent of the pointer.

Since the callback needs to dereference a raw pointer, it requires unsafe code. To avoid forcing this unsafety on most callers, the ToHandle trait is implemented for common data structures. Types that implement ToHandle can be wrapped into an OwningHandle without passing a callback.

Fields

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Methods

impl<O, H> OwningHandle<O, H> where
    O: StableAddress,
    O::Target: ToHandle<Handle = H>,
    H: Deref
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create a new OwningHandle for a type that implements ToHandle. For types that don't implement ToHandle, callers may invoke new_with_fn, which accepts a callback to perform the conversion.

impl<O, H> OwningHandle<O, H> where
    O: StableAddress,
    O::Target: ToHandleMut<HandleMut = H>,
    H: DerefMut
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create a new mutable OwningHandle for a type that implements ToHandleMut.

impl<O, H> OwningHandle<O, H> where
    O: StableAddress,
    H: Deref
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create a new OwningHandle. The provided callback will be invoked with a pointer to the object owned by o, and the returned value is stored as the object to which this OwningHandle will forward Deref and DerefMut.

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create a new OwningHandle. The provided callback will be invoked with a pointer to the object owned by o, and the returned value is stored as the object to which this OwningHandle will forward Deref and DerefMut.

Trait Implementations

impl<O, H> Deref for OwningHandle<O, H> where
    O: StableAddress,
    H: Deref
[src]

The resulting type after dereferencing.

Dereferences the value.

impl<O, H> StableAddress for OwningHandle<O, H> where
    O: StableAddress,
    H: StableAddress
[src]

impl<O, H> DerefMut for OwningHandle<O, H> where
    O: StableAddress,
    H: DerefMut
[src]

Mutably dereferences the value.

Auto Trait Implementations

impl<O, H> Send for OwningHandle<O, H> where
    H: Send,
    O: Send

impl<O, H> Sync for OwningHandle<O, H> where
    H: Sync,
    O: Sync

Blanket Implementations

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> From for T
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Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

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

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

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

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

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

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

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

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T