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Struct OwnedMappedMutexGuard 

pub struct OwnedMappedMutexGuard<T: ?Sized, U: ?Sized = T> { /* private fields */ }
Available on crate feature sync only.

A owned handle to a held Mutex that has had a function applied to it via OwnedMutexGuard::map.

This can be used to hold a subfield of the protected data.

Implementations

impl<T: ?Sized, U: ?Sized> OwnedMappedMutexGuard<T, U>

pub fn map<S, F>(this: Self, f: F) -> OwnedMappedMutexGuard<T, S>
where F: FnOnce(&mut U) -> &mut S,

Makes a new OwnedMappedMutexGuard for a component of the locked data.

This operation cannot fail as the OwnedMappedMutexGuard passed in already locked the mutex.

This is an associated function that needs to be used as OwnedMappedMutexGuard::map(...). A method would interfere with methods of the same name on the contents of the locked data.

pub fn try_map<S, F>( this: Self, f: F, ) -> Result<OwnedMappedMutexGuard<T, S>, Self>
where F: FnOnce(&mut U) -> Option<&mut S>,

Attempts to make a new OwnedMappedMutexGuard for a component of the locked data. The original guard is returned if the closure returns None.

This operation cannot fail as the OwnedMutexGuard passed in already locked the mutex.

This is an associated function that needs to be used as OwnedMutexGuard::try_map(...). A method would interfere with methods of the same name on the contents of the locked data.

Trait Implementations

impl<T: ?Sized, U: ?Sized + Debug> Debug for OwnedMappedMutexGuard<T, U>

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

Formats the value using the given formatter. Read more

impl<T: ?Sized, U: ?Sized> Deref for OwnedMappedMutexGuard<T, U>

type Target = U

The resulting type after dereferencing.

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

Dereferences the value.

impl<T: ?Sized, U: ?Sized> DerefMut for OwnedMappedMutexGuard<T, U>

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

Mutably dereferences the value.

impl<T: ?Sized, U: ?Sized + Display> Display for OwnedMappedMutexGuard<T, U>

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

Formats the value using the given formatter. Read more

impl<T: ?Sized, U: ?Sized> Drop for OwnedMappedMutexGuard<T, U>

fn drop(&mut self)

Executes the destructor for this type. Read more

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)
Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned. Read more

impl<T, U> Send for OwnedMappedMutexGuard<T, U>
where T: ?Sized + Send, U: ?Sized + Send,

impl<T, U> Sync for OwnedMappedMutexGuard<T, U>
where T: ?Sized + Send + Sync, U: ?Sized + Send + Sync,

Auto Trait Implementations

impl<T, U = T> !RefUnwindSafe for OwnedMappedMutexGuard<T, U>

impl<T, U = T> !UnwindSafe for OwnedMappedMutexGuard<T, U>

impl<T, U> Freeze for OwnedMappedMutexGuard<T, U>
where T: ?Sized, U: ?Sized,

impl<T, U> Unpin for OwnedMappedMutexGuard<T, U>
where T: ?Sized, U: ?Sized,

impl<T, U> UnsafeUnpin for OwnedMappedMutexGuard<T, U>
where T: ?Sized, U: ?Sized,

Blanket Implementations

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self> ⓘ

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self> ⓘ

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.

impl<T> ToString for T
where T: Display + ?Sized,

fn to_string(&self) -> String

Converts the given value to a String. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> ⓘ
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

fn with_current_subscriber(self) -> WithDispatch<Self> ⓘ

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

MIT License
Copyright © Tokio Contributors
https://docs.rs/tokio/1.53.1/tokio/sync/struct.OwnedMappedMutexGuard.html

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