Struct Fingerprint 

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

A per-symbol content fingerprint: the first 16 bytes of a BLAKE3 digest.

Language adapters compute two per symbol (see sealmap-extract’s fingerprint module): sig_hash over the contract and body_hash over the implementation. The model only stores, compares, prints and parses them.

Displayed and serialised as blake3-16:<32 hex chars>. 128 bits keeps an accidental collision out of reach for any realistic number of symbols while halving the text a full digest would cost in every model and lock.

Fingerprint::default is all zeros and means “not fingerprinted”: a symbol built by hand with Symbol::new carries it until a language adapter fills in real values.

use sealmap_model::Fingerprint;

let f = Fingerprint::from_bytes([0xab; 16]);
let text = f.to_string();
assert_eq!(text, format!("blake3-16:{}", "ab".repeat(16)));
assert_eq!(Fingerprint::parse(&text), Some(f));
assert!(Fingerprint::default().is_unset());

Implementations

impl Fingerprint

pub const PREFIX: &'static str = "blake3-16:"

The text prefix naming the algorithm and length.

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

Wrap 16 digest bytes.

pub fn from_blake3(hash: &Hash) -> Self

Truncate a full BLAKE3 digest.

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

The digest bytes.

pub fn is_unset(&self) -> bool

true for the all-zero “not fingerprinted” value.

pub fn parse(s: &str) -> Option<Self>

Parse blake3-16:<32 hex> (either case).

pub fn merge(self, other: Self) -> Self

Fold two fingerprints of the same symbol into one, independent of their order. Used when #[cfg]-gated twins share an id and are merged by Codebase::add_symbol: a change to either twin changes the merged value.

use sealmap_model::Fingerprint;

let (a, b) = (Fingerprint::from_bytes([1; 16]), Fingerprint::from_bytes([2; 16]));
assert_eq!(a.merge(b), b.merge(a));
assert_ne!(a.merge(b), a);

Trait Implementations

impl Clone for Fingerprint

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Fingerprint

impl Debug for Fingerprint

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

Formats the value using the given formatter.

impl Default for Fingerprint

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Fingerprint

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for Fingerprint

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

Formats the value using the given formatter.

impl Eq for Fingerprint

impl Hash for Fingerprint

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 Ord for Fingerprint

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Fingerprint

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Fingerprint

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Fingerprint

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Fingerprint