Enum FetchEndOfRange 

#[repr(u64)]
pub enum FetchEndOfRange {
    NonExistent = 140,
    Unknown = 268,
}

The two Serialization Flags values draft-16 gives a meaning of their own instead of reading as a bit field, from Section 10.4.4 Table 4.

The bits of Serialization Flags are flags only “when less than 128”; Table 4 assigns two larger values, and of everything else at or above 128 the section says “Any other value is a PROTOCOL_VIOLATION”. That is why FetchObjectHeader::decode refuses an unassigned large value outright rather than carrying it through as an unknown flag word — there is no framing to parse behind it.

Both markers stand in for a span of Objects rather than one: Section 10.4.4.2 reads them as covering every Location between the previous serialized Object, if any, and this one, inclusive.

Variants

NonExistent = 140

End of Non-Existent Range (0x8C): every Object in the covered span is known not to exist. Section 10.4.4.2 adds that a publisher SHOULD NOT use this except to split a span it will not serialize into the part known absent and the part whose status is unknown.

Unknown = 268

End of Unknown Range (0x10C): the status of every Object in the covered span is unknown.

Implementations

impl FetchEndOfRange

pub const ALL: &[FetchEndOfRange]

Both values Table 4 assigns, in ascending wire order.

This is exactly the set FetchEndOfRange::from_u64 accepts above the flag range.

pub fn from_u64(v: u64) -> Option<Self>

The Table 4 meaning of v, or None when v is a flag word (anything below 128) or a large value the table leaves unassigned.

The two answers None covers are not the same thing, and callers must not merge them: a flag word is ordinary framing, an unassigned large value is a protocol violation. FetchObjectHeader::decode separates them by testing the 128 boundary itself.

pub fn as_u64(self) -> u64

Return the wire value.

Trait Implementations

impl Clone for FetchEndOfRange

fn clone(&self) -> FetchEndOfRange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FetchEndOfRange

impl Debug for FetchEndOfRange

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

Formats the value using the given formatter.

impl Eq for FetchEndOfRange

impl PartialEq for FetchEndOfRange

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FetchEndOfRange