Enum SubgroupIdEncoding 

pub enum SubgroupIdEncoding {
    Zero,
    SameAsPrior,
    PriorPlusOne,
    Present,
}

How a draft-15 fetch object carries its Subgroup ID.

The two least significant bits of the Serialization Flags are one field, not two independent flags: draft-15 Section 10.4.4, Table 7 gives all four of their values a meaning, and only one of them puts a Subgroup ID on the wire. Reading either bit on its own gets the wrong answer for half the values.

Variants

Zero

0x00: the Subgroup ID is zero, whatever the preceding object’s was.

SameAsPrior

0x01: the Subgroup ID is the prior object’s.

PriorPlusOne

0x02: the Subgroup ID is the prior object’s plus one.

Present

0x03: the Subgroup ID follows as a varint.

Implementations

impl SubgroupIdEncoding

pub fn from_flags(flags: u8) -> Self

Read the two-bit field out of a Serialization Flags byte.

pub fn as_bits(self) -> u8

The bit pattern this encoding occupies in a Serialization Flags byte.

pub fn references_prior(self) -> bool

Whether resolving a Subgroup ID under this encoding needs the object before it on the stream.

SubgroupIdEncoding::Zero does not, which is what makes it the one implicit form a stream’s first object may use.

Trait Implementations

impl Clone for SubgroupIdEncoding

fn clone(&self) -> SubgroupIdEncoding

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SubgroupIdEncoding

impl Debug for SubgroupIdEncoding

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

Formats the value using the given formatter.

impl Eq for SubgroupIdEncoding

impl PartialEq for SubgroupIdEncoding

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SubgroupIdEncoding