Struct Fingerprint 

pub struct Fingerprint {
    pub bytes: u64,
    pub hash: u64,
}

A fingerprint of file content. Used with FsBackend::fingerprint and Fingerprint::of: edit_file records the fingerprint after reading, and takes it again before writing; a mismatch indicates a concurrent write conflict.

Uses (bytes, hash) instead of a plain hash: comparing both length and hash reduces the collision probability of a single u64 hash to negligible. DefaultHasher is only used for in-process one-shot comparisons, never persisted or shared across processes, so the standard library’s “unspecified but stable” semantics are acceptable.

Fields

bytes: u64

hash: u64

Implementations

impl Fingerprint

pub fn of(content: &str) -> Self

Compute a fingerprint directly from a text string. edit_file uses this after reading old_content to avoid re-reading before writing.

Trait Implementations

impl Clone for Fingerprint

fn clone(&self) -> Fingerprint

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 Eq for Fingerprint

impl PartialEq for Fingerprint

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Fingerprint