Struct WithPrevious 

pub struct WithPrevious<T> {
    pub previous: Option<T>,
    pub current: T,
}

Represents a value paired with its previous value in the stream.

Used by CombineWithPreviousExt to provide both current and previous values.

Fields

previous: Option<T>

The previous value in the stream, if any

current: T

The current value in the stream

Implementations

impl<T> WithPrevious<T>

pub fn new(previous: Option<T>, current: T) -> Self

Creates a new WithPrevious with the given previous and current values.

pub fn has_previous(&self) -> bool

Returns true if there is a previous value.

pub fn as_pair(&self) -> Option<(&T, &T)>

Returns a tuple of references to (previous, current) if previous exists.

Trait Implementations

impl<T: Clone> Clone for WithPrevious<T>

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

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for WithPrevious<T>

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

Formats the value using the given formatter.

impl<T: Timestamped> HasTimestamp for WithPrevious<T>

type Inner = <T as HasTimestamp>::Inner

The type of the inner value wrapped by this timestamped type

type Timestamp = <T as HasTimestamp>::Timestamp

The type representing the timestamp

fn timestamp(&self) -> Self::Timestamp

Returns the timestamp value for this item. Stream operators use this to determine the order of items.

impl<T: Ord> Ord for WithPrevious<T>

fn cmp(&self, other: &WithPrevious<T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq for WithPrevious<T>

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: PartialOrd> PartialOrd for WithPrevious<T>

fn partial_cmp(&self, other: &WithPrevious<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: Timestamped> Timestamped for WithPrevious<T>

fn with_timestamp(value: Self::Inner, timestamp: Self::Timestamp) -> Self

Creates a new instance wrapping the given value with the specified timestamp.

fn with_fresh_timestamp(value: Self::Inner) -> Self

Creates a new instance wrapping the given value with a fresh timestamp. This is called by operators when emitting new values. Each implementation determines how to generate fresh timestamps (e.g., Utc::now() for chrono, atomic counter for u64, etc.)

fn into_inner(self) -> Self::Inner

Consumes self and returns the inner value. For wrapper types like Sequenced<T>, this extracts T. For domain types where Inner = Self, this typically returns self.

impl<T: Eq> Eq for WithPrevious<T>

impl<T> StructuralPartialEq for WithPrevious<T>