Struct MutexGuard 

pub struct MutexGuard<'a, T>
where
    T: ?Sized,
{ /* private fields */ }

An RAII guard returned by the lock and try_lock methods. When this structure is dropped (falls out of scope), the lock will be unlocked.

Implementations

impl<'a, T> MutexGuard<'a, T>

where T: ?Sized,

pub fn map<U, F>(this: MutexGuard<'a, T>, f: F) -> MappedMutexGuard<'a, T, U>

where F: FnOnce(&mut T) -> &mut U, U: ?Sized,

Returns a locked view over a portion of the locked data.

Example

use futures::lock::{Mutex, MutexGuard};

let data = Mutex::new(Some("value".to_string()));
{
    let locked_str = MutexGuard::map(data.lock().await, |opt| opt.as_mut().unwrap());
    assert_eq!(&*locked_str, "value");
}

Trait Implementations

impl<T> Debug for MutexGuard<'_, T>

where T: Debug + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Deref for MutexGuard<'_, T>

where T: ?Sized,

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for MutexGuard<'_, T>

where T: ?Sized,

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

impl<T> Drop for MutexGuard<'_, T>

where T: ?Sized,

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl<T> Send for MutexGuard<'_, T>

where T: Send + ?Sized,

impl<T> Sync for MutexGuard<'_, T>

where T: Sync + ?Sized,