Trait Boundedness 

pub trait Boundedness:
    SingletonBound<UnderlyingBound = Self>
    + KeyedSingletonBound<UnderlyingBound = Self>
    + Sealed {
    type PreserveOrderIfBounded<InO: Ordering>: Ordering;

    const BOUNDED: bool;
    const BOUND_KIND: BoundKind = _;
}

A marker trait indicating whether a stream’s length is bounded (finite) or unbounded (potentially infinite).

Implementors of this trait use it to signal the boundedness property of a stream.

Required Associated Constants

const BOUNDED: bool

true if the bound is Bounded, false if it is Unbounded.

Provided Associated Constants

const BOUND_KIND: BoundKind = _

The BoundKind corresponding to this type.

Required Associated Types

type PreserveOrderIfBounded<InO: Ordering>: Ordering

Determines the output ordering of a join based on this (right/build) side’s boundedness.

When this side is Bounded, the join accumulates this side first and then streams the left side through, preserving the left side’s ordering InO. When this side is Unbounded, a symmetric hash join is used and ordering is lost.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Boundedness for Bounded

const BOUNDED: bool = true

type PreserveOrderIfBounded<InO: Ordering> = InO

impl Boundedness for Unbounded

const BOUNDED: bool = false

type PreserveOrderIfBounded<InO: Ordering> = NoOrder