Enum GroupOrder 

pub enum GroupOrder {
    Ascending,
    Descending,
}

The order a FETCH response’s Groups arrive in, which decides how a Group ID Delta is applied.

Draft-19 Section 11.4.4.1: “If the Group Order is Ascending, the Group ID is the prior Object’s Group ID plus the Group ID Delta + 1. If the Group Order is Descending, the Group ID is the prior Object’s Group ID minus the (Group ID Delta + 1).”

The order is not on the data stream — it is settled by the control exchange that opened the FETCH, whose GROUP_ORDER parameter (Section 10.2.8) spells Ascending 0x1 and Descending 0x2 — so FetchObjectReader has to be told which one it is reading. Getting it wrong does not fail to parse: it decodes every Object under a Group ID that walks the wrong way.

Variants

Ascending

Group IDs increase: a delta adds to the prior Group ID.

Descending

Group IDs decrease: a delta subtracts from the prior Group ID.

Trait Implementations

impl Clone for GroupOrder

fn clone(&self) -> GroupOrder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for GroupOrder

impl Debug for GroupOrder

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

Formats the value using the given formatter.

impl Eq for GroupOrder

impl PartialEq for GroupOrder

fn eq(&self, other: &GroupOrder) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for GroupOrder