Struct holochain::prelude::dependencies::kitsune_p2p_types::dependencies::lair_keystore_api::dependencies::tokio::sync::OwnedRwLockReadGuard
source · pub struct OwnedRwLockReadGuard<T, U = T>{ /* private fields */ }
Expand description
Owned RAII structure used to release the shared read access of a lock when dropped.
This structure is created by the read_owned
method on
RwLock
.
Implementations§
source§impl<T, U> OwnedRwLockReadGuard<T, U>
impl<T, U> OwnedRwLockReadGuard<T, U>
sourcepub fn map<F, V>(
this: OwnedRwLockReadGuard<T, U>,
f: F
) -> OwnedRwLockReadGuard<T, V>
pub fn map<F, V>( this: OwnedRwLockReadGuard<T, U>, f: F ) -> OwnedRwLockReadGuard<T, V>
Makes a new OwnedRwLockReadGuard
for a component of the locked data.
This operation cannot fail as the OwnedRwLockReadGuard
passed in
already locked the data.
This is an associated function that needs to be
used as OwnedRwLockReadGuard::map(...)
. A method would interfere with
methods of the same name on the contents of the locked data.
§Examples
use std::sync::Arc;
use tokio::sync::{RwLock, OwnedRwLockReadGuard};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct Foo(u32);
let lock = Arc::new(RwLock::new(Foo(1)));
let guard = lock.read_owned().await;
let guard = OwnedRwLockReadGuard::map(guard, |f| &f.0);
assert_eq!(1, *guard);
sourcepub fn try_map<F, V>(
this: OwnedRwLockReadGuard<T, U>,
f: F
) -> Result<OwnedRwLockReadGuard<T, V>, OwnedRwLockReadGuard<T, U>>
pub fn try_map<F, V>( this: OwnedRwLockReadGuard<T, U>, f: F ) -> Result<OwnedRwLockReadGuard<T, V>, OwnedRwLockReadGuard<T, U>>
Attempts to make a new OwnedRwLockReadGuard
for a component of the
locked data. The original guard is returned if the closure returns
None
.
This operation cannot fail as the OwnedRwLockReadGuard
passed in
already locked the data.
This is an associated function that needs to be used as
OwnedRwLockReadGuard::try_map(..)
. A method would interfere with
methods of the same name on the contents of the locked data.
§Examples
use std::sync::Arc;
use tokio::sync::{RwLock, OwnedRwLockReadGuard};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct Foo(u32);
let lock = Arc::new(RwLock::new(Foo(1)));
let guard = lock.read_owned().await;
let guard = OwnedRwLockReadGuard::try_map(guard, |f| Some(&f.0)).expect("should not fail");
assert_eq!(1, *guard);
Trait Implementations§
source§impl<T, U> Debug for OwnedRwLockReadGuard<T, U>
impl<T, U> Debug for OwnedRwLockReadGuard<T, U>
source§impl<T, U> Deref for OwnedRwLockReadGuard<T, U>
impl<T, U> Deref for OwnedRwLockReadGuard<T, U>
source§impl<T, U> Display for OwnedRwLockReadGuard<T, U>
impl<T, U> Display for OwnedRwLockReadGuard<T, U>
source§impl<T, U> Drop for OwnedRwLockReadGuard<T, U>
impl<T, U> Drop for OwnedRwLockReadGuard<T, U>
impl<T, U> Send for OwnedRwLockReadGuard<T, U>
impl<T, U> Sync for OwnedRwLockReadGuard<T, U>
Auto Trait Implementations§
impl<T, U = T> !RefUnwindSafe for OwnedRwLockReadGuard<T, U>
impl<T: ?Sized, U: ?Sized> Unpin for OwnedRwLockReadGuard<T, U>where
T: Unpin,
impl<T, U = T> !UnwindSafe for OwnedRwLockReadGuard<T, U>
Blanket Implementations§
source§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
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_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
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impl<P> AsStoreRef for P
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T: ?Sized,
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T: ?Sized,
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source§impl<T> Pointable for T
impl<T> Pointable for T
source§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
source§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
self
from the equivalent element of its
superset. Read moresource§fn is_in_subset(&self) -> bool
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self
is actually part of its subset T
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but without any property checks. Always succeeds.source§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
self
to the equivalent element of its superset.