Struct lair_keystore::dependencies::hc_seed_bundle::dependencies::futures::lock::MappedMutexGuard
[−]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.
Implementations
impl<'a, T, U> MappedMutexGuard<'a, T, U> where
T: ?Sized,
U: ?Sized,
impl<'a, T, U> MappedMutexGuard<'a, T, U> where
T: ?Sized,
U: ?Sized,
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,
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
impl<'_, T, U> Debug for MappedMutexGuard<'_, T, U> where
U: Debug + ?Sized,
T: ?Sized,
impl<'_, T, U> Debug for MappedMutexGuard<'_, T, U> where
U: Debug + ?Sized,
T: ?Sized,
impl<'_, T, U> Deref for MappedMutexGuard<'_, T, U> where
T: ?Sized,
U: ?Sized,
impl<'_, T, U> Deref for MappedMutexGuard<'_, T, U> where
T: ?Sized,
U: ?Sized,
impl<'_, T, U> DerefMut for MappedMutexGuard<'_, T, U> where
T: ?Sized,
U: ?Sized,
impl<'_, T, U> DerefMut for MappedMutexGuard<'_, T, U> where
T: ?Sized,
U: ?Sized,
impl<'_, T, U> Drop for MappedMutexGuard<'_, T, U> where
T: ?Sized,
U: ?Sized,
impl<'_, T, U> Drop for MappedMutexGuard<'_, T, U> where
T: ?Sized,
U: ?Sized,
impl<'_, T, U> Send for MappedMutexGuard<'_, T, U> where
T: Send + ?Sized,
U: Send + ?Sized,
impl<'_, T, U> Sync for MappedMutexGuard<'_, T, U> where
T: Sync + ?Sized,
U: Sync + ?Sized,
Auto Trait Implementations
impl<'a, T, U> !RefUnwindSafe for MappedMutexGuard<'a, T, U>
impl<'a, T: ?Sized, U: ?Sized> Unpin for MappedMutexGuard<'a, T, U>
impl<'a, T, U> !UnwindSafe for MappedMutexGuard<'a, T, U>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
impl<T> Pointable for T
impl<T> Pointable for T
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
fn vzip(self) -> V
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more