Struct lair_keystore::dependencies::hc_seed_bundle::dependencies::futures::lock::MappedMutexGuard

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pub struct MappedMutexGuard<'a, T, U>
where
    T: ?Sized,
    U: ?Sized,
{ /* private fields */ }
Expand description

An RAII guard returned by the MutexGuard::map and MappedMutexGuard::map methods. When this structure is dropped (falls out of scope), the lock will be unlocked.

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impl<'a, T, U> MappedMutexGuard<'a, T, U>
where T: ?Sized, U: ?Sized,

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pub fn map<V, F>( this: MappedMutexGuard<'a, T, U>, f: F, ) -> MappedMutexGuard<'a, T, V>
where F: FnOnce(&mut U) -> &mut V, V: ?Sized,

Returns a locked view over a portion of the locked data.

§Example
use futures::lock::{MappedMutexGuard, Mutex, MutexGuard};

let data = Mutex::new(Some("value".to_string()));
{
    let locked_str = MutexGuard::map(data.lock().await, |opt| opt.as_mut().unwrap());
    let locked_char = MappedMutexGuard::map(locked_str, |s| s.get_mut(0..1).unwrap());
    assert_eq!(&*locked_char, "v");
}

Trait Implementations§

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impl<T, U> Debug for MappedMutexGuard<'_, T, U>
where U: Debug + ?Sized, T: ?Sized,

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

Formats the value using the given formatter. Read more
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impl<T, U> Deref for MappedMutexGuard<'_, T, U>
where T: ?Sized, U: ?Sized,

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type Target = U

The resulting type after dereferencing.
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fn deref(&self) -> &U

Dereferences the value.
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impl<T, U> DerefMut for MappedMutexGuard<'_, T, U>
where T: ?Sized, U: ?Sized,

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

Mutably dereferences the value.
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impl<T, U> Drop for MappedMutexGuard<'_, T, U>
where T: ?Sized, U: ?Sized,

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<T, U> Send for MappedMutexGuard<'_, T, U>
where T: Send + ?Sized, U: Send + ?Sized,

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impl<T, U> Sync for MappedMutexGuard<'_, T, U>
where T: Sync + ?Sized, U: Sync + ?Sized,

Auto Trait Implementations§

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impl<'a, T, U> Freeze for MappedMutexGuard<'a, T, U>
where T: ?Sized, U: ?Sized,

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impl<'a, T, U> !RefUnwindSafe for MappedMutexGuard<'a, T, U>

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impl<'a, T, U> Unpin for MappedMutexGuard<'a, T, U>
where T: ?Sized, U: ?Sized,

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impl<'a, T, U> !UnwindSafe for MappedMutexGuard<'a, T, U>

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self> ⓘ

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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

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