Struct tokio::sync::MappedMutexGuard

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pub struct MappedMutexGuard<'a, T: ?Sized> { /* private fields */ }
Expand description

A handle to a held Mutex that has had a function applied to it via MutexGuard::map.

This can be used to hold a subfield of the protected data.

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impl<'a, T: ?Sized> MappedMutexGuard<'a, T>

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pub fn map<U, F>(this: Self, f: F) -> MappedMutexGuard<'a, U>
where F: FnOnce(&mut T) -> &mut U,

Makes a new MappedMutexGuard for a component of the locked data.

This operation cannot fail as the MappedMutexGuard passed in already locked the mutex.

This is an associated function that needs to be used as MappedMutexGuard::map(...). A method would interfere with methods of the same name on the contents of the locked data.

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pub fn try_map<U, F>(this: Self, f: F) -> Result<MappedMutexGuard<'a, U>, Self>
where F: FnOnce(&mut T) -> Option<&mut U>,

Attempts to make a new MappedMutexGuard for a component of the locked data. The original guard is returned if the closure returns None.

This operation cannot fail as the MappedMutexGuard passed in already locked the mutex.

This is an associated function that needs to be used as MappedMutexGuard::try_map(...). A method would interfere with methods of the same name on the contents of the locked data.

Trait Implementations§

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impl<'a, T: ?Sized + Debug> Debug for MappedMutexGuard<'a, T>

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

Formats the value using the given formatter. Read more
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impl<'a, T: ?Sized> Deref for MappedMutexGuard<'a, T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<'a, T: ?Sized> DerefMut for MappedMutexGuard<'a, T>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<'a, T: ?Sized + Display> Display for MappedMutexGuard<'a, T>

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

Formats the value using the given formatter. Read more
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impl<'a, T: ?Sized> Drop for MappedMutexGuard<'a, T>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<'a, T> Send for MappedMutexGuard<'a, T>
where T: ?Sized + Send + 'a,

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impl<'a, T> Sync for MappedMutexGuard<'a, T>
where T: ?Sized + Sync + 'a,

Auto Trait Implementations§

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impl<'a, T> Freeze for MappedMutexGuard<'a, T>
where T: ?Sized,

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impl<'a, T> !RefUnwindSafe for MappedMutexGuard<'a, T>

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impl<'a, T> Unpin for MappedMutexGuard<'a, T>
where T: ?Sized,

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impl<'a, T> !UnwindSafe for MappedMutexGuard<'a, T>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.