[−][src]Struct futures_util::lock::MappedMutexGuard
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: ?Sized, U: ?Sized> MappedMutexGuard<'a, T, U>
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pub fn map<V: ?Sized, F>(this: Self, f: F) -> MappedMutexGuard<'a, T, V> where
F: FnOnce(&mut U) -> &mut V,
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F: FnOnce(&mut U) -> &mut V,
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: ?Sized, U: ?Sized + Debug, '_> Debug for MappedMutexGuard<'_, T, U>
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impl<T: ?Sized, U: ?Sized, '_> Deref for MappedMutexGuard<'_, T, U>
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impl<T: ?Sized, U: ?Sized, '_> DerefMut for MappedMutexGuard<'_, T, U>
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impl<T: ?Sized, U: ?Sized, '_> Drop for MappedMutexGuard<'_, T, U>
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impl<T: ?Sized + Send, U: ?Sized, '_> Send for MappedMutexGuard<'_, T, U>
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impl<T: ?Sized + Sync, U: ?Sized, '_> Sync for MappedMutexGuard<'_, T, U>
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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
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut Tⓘ
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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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>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,