Struct bitflags::__core::sync::RwLockReadGuard

#[must_use]
pub struct RwLockReadGuard<'a, T> where T: 'a + ?Sized {
    // some fields omitted
}

RAII structure used to release the shared read access of a lock when dropped.

Methods

impl<'rwlock, T> RwLockReadGuard<'rwlock, T> where T: ?Sized

fn map<U, F>(this: RwLockReadGuard<'rwlock, T>, cb: F) -> RwLockReadGuard<'rwlock, U> where U: ?Sized, F: FnOnce(&T) -> &U

Deprecated since 1.8.0

: unsound on Mutex because of Condvar and RwLock may also with to be used with Condvar one day

Transform this guard to hold a sub-borrow of the original data.

Applies the supplied closure to the data, returning a new lock guard referencing the borrow returned by the closure.

Examples

let x = RwLock::new(vec![1, 2]);

let y = RwLockReadGuard::map(x.read().unwrap(), |v| &v[0]);
assert_eq!(*y, 1);

Trait Implementations

impl<'a, T> !Send for RwLockReadGuard<'a, T> where T: ?Sized

impl<'rwlock, T> Deref for RwLockReadGuard<'rwlock, T> where T: ?Sized

type Target = T

fn deref(&self) -> &T

impl<'a, T> Drop for RwLockReadGuard<'a, T> where T: ?Sized

fn drop(&mut self)