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Add RwLockWriteGuard::{downgrade_map, try_downgrade_map}. #5527

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merged 5 commits into from
Mar 8, 2023
Merged

Add RwLockWriteGuard::{downgrade_map, try_downgrade_map}. #5527

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91fe74a
Add `RwLockWriteGuard::{downgrade_map, try_downgrade_map}`.
Zenithsiz Mar 7, 2023
180e2d3
Fixed `RwLockWriteGuard::{downgrade_map, try_downgrade_map}` not prop…
Zenithsiz Mar 7, 2023
6f636d5
Added `OwnedRwLockWriteGuard::{downgrade_map, try_downgrade_map}`.
Zenithsiz Mar 7, 2023
cd5e3cb
Improved some doctests readability.
Zenithsiz Mar 7, 2023
f9f2930
Added tests for `{Mapped}RwLockWriteGuard::{downgrade_map, try_downgr…
Zenithsiz Mar 7, 2023
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Improved some doctests readability.
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@Zenithsiz
Zenithsiz committed Mar 7, 2023
commit cd5e3cb3615025ab531d85eb68324d12296f9c62
6 changes: 4 additions & 2 deletions tokio/src/sync/rwlock/owned_write_guard.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,8 @@ impl<T: ?Sized> OwnedRwLockWriteGuard<T> {
/// # async fn main() {
/// let lock = Arc::new(RwLock::new(Foo(1)));
///
/// let mapped = OwnedRwLockWriteGuard::downgrade_map(Arc::clone(&lock).write_owned().await, |f| &f.0);
/// let guard = Arc::clone(&lock).write_owned().await;
/// let mapped = OwnedRwLockWriteGuard::downgrade_map(guard, |f| &f.0);
/// let foo = lock.read_owned().await;
/// assert_eq!(foo.0, *mapped);
/// # }
Expand Down Expand Up @@ -258,7 +259,8 @@ impl<T: ?Sized> OwnedRwLockWriteGuard<T> {
/// # async fn main() {
/// let lock = Arc::new(RwLock::new(Foo(1)));
///
/// let guard = OwnedRwLockWriteGuard::try_downgrade_map(Arc::clone(&lock).write_owned().await, |f| Some(&f.0)).expect("should not fail");
/// let guard = Arc::clone(&lock).write_owned().await;
/// let guard = OwnedRwLockWriteGuard::try_downgrade_map(guard, |f| Some(&f.0)).expect("should not fail");
/// let foo = lock.read_owned().await;
/// assert_eq!(foo.0, *guard);
/// # }
Expand Down