matrix_sdk_base::ring_buffer

Struct RingBuffer

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pub struct RingBuffer<T> { /* private fields */ }
Expand description

A simple fixed-size ring buffer implementation.

A size is provided on creation, and the ring buffer reserves that much space, and never reallocates.

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impl<T> RingBuffer<T>

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pub fn new(size: NonZero<usize>) -> RingBuffer<T>

Create a ring buffer with the supplied capacity, reserving it so we never need to reallocate.

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pub fn len(&self) -> usize

Returns the number of items that are stored in this ring buffer.

This is the dynamic size indicating how many items are held in the buffer, not the fixed capacity.

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pub fn is_empty(&self) -> bool

Returns true if the ring buffer contains no elements.

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pub fn get(&self, index: usize) -> Option<&T>

Provides a reference to the element at the given index.

Element at index zero is the “front” i.e. one that will be returned if we call pop().

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pub fn push(&mut self, value: T)

Appends an element to the back of the ring buffer

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pub fn pop(&mut self) -> Option<T>

Removes the first element and returns it, or None if the ring buffer is empty.

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pub fn remove(&mut self, index: usize) -> Option<T>

Removes and returns one specific element at index if it exists, otherwise it returns None.

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pub fn iter(&self) -> Iter<'_, T>

Returns an iterator that provides elements in front-to-back order, i.e. the same order you would get if you repeatedly called pop().

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pub fn iter_mut(&mut self) -> IterMut<'_, T>

Returns a mutable iterator that provides elements in front-to-back order, i.e. the same order you would get if you repeatedly called pop().

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pub fn drain<R>(&mut self, range: R) -> Drain<'_, T>
where R: RangeBounds<usize>,

Returns an iterator that drains its items.

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pub fn clear(&mut self)

Clears the ring buffer, removing all values. This does not affect the capacity.

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pub fn capacity(&self) -> usize

Returns the total number of elements the RingBuffer can hold.

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pub fn retain<F>(&mut self, predicate: F)
where F: FnMut(&T) -> bool,

Retains only the elements specified by the predicate.

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impl<T> Clone for RingBuffer<T>
where T: Clone,

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fn clone(&self) -> RingBuffer<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Debug for RingBuffer<T>
where T: Debug,

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

Formats the value using the given formatter. Read more
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impl<'de, T> Deserialize<'de> for RingBuffer<T>
where T: Deserialize<'de>,

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fn deserialize<__D>( __deserializer: __D, ) -> Result<RingBuffer<T>, <__D as Deserializer<'de>>::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<U> Extend<U> for RingBuffer<U>

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fn extend<T>(&mut self, iter: T)
where T: IntoIterator<Item = U>,

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl<T> PartialEq for RingBuffer<T>
where T: PartialEq,

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fn eq(&self, other: &RingBuffer<T>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> Serialize for RingBuffer<T>
where T: Serialize,

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fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<T> StructuralPartialEq for RingBuffer<T>

Auto Trait Implementations§

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impl<T> Freeze for RingBuffer<T>

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impl<T> RefUnwindSafe for RingBuffer<T>
where T: RefUnwindSafe,

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impl<T> Send for RingBuffer<T>
where T: Send,

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impl<T> Sync for RingBuffer<T>
where T: Sync,

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impl<T> Unpin for RingBuffer<T>
where T: Unpin,

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impl<T> UnwindSafe for RingBuffer<T>
where T: UnwindSafe,

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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, W> HasTypeWitness<W> for T
where W: MakeTypeWitness<Arg = T>, T: ?Sized,

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const WITNESS: W = W::MAKE

A constant of the type witness
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impl<T> Identity for T
where T: ?Sized,

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const TYPE_EQ: TypeEq<T, <T as Identity>::Type> = TypeEq::NEW

Proof that Self is the same type as Self::Type, provides methods for casting between Self and Self::Type.
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type Type = T

The same type as Self, used to emulate type equality bounds (T == U) with associated type equality constraints (T: Identity<Type = U>).
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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> AsyncTraitDeps for T

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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

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impl<T> SendOutsideWasm for T
where T: Send,

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impl<T> SyncOutsideWasm for T
where T: Sync,