Struct Tag 

pub struct Tag(/* private fields */);

The 128 bit shape tag.

Half of a BLAKE3 hash, which is enough: the tag is compared, never searched for, and a collision would need two descriptions someone deliberately built to collide.

Implementations

impl Tag

pub const UNTYPED: Tag

The tag of a collection created over the wire, which has no type.

pub fn of(description: &[u8]) -> Tag

The tag of these description bytes.

pub fn for_type<T: Shape + ?Sized>() -> Tag

The tag of T, which is the call a typed handle makes when it opens.

pub const fn as_bytes(&self) -> &[u8; 16]

The bytes as stored in the catalogue.

pub const fn from_bytes(bytes: [u8; 16]) -> Tag

A tag read back out of the catalogue.

pub fn is_untyped(&self) -> bool

Whether this is the untyped tag, meaning the collection was created over RESP3 and is checked per element instead (15 section 3.3).

Trait Implementations

impl Clone for Tag

fn clone(&self) -> Tag

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Tag

impl Debug for Tag

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

Formats the value using the given formatter.

impl Default for Tag

fn default() -> Tag

Returns the “default value” for a type.

impl Display for Tag

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

Formats the value using the given formatter.

impl Eq for Tag

impl Hash for Tag

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Tag

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Tag