Enum Change 

#[non_exhaustive]
pub enum Change<'a> {
    Set {
        record: Record<'a>,
        effective_app: Option<AppId<'a>>,
    },
    Remove(Record<'a>),
}

A change to a current record or its inherited app.

Unchanged reports emit no change, even though they refresh eviction order. An ancestor update can change a child’s effective app without a child report. Keep reports and lifecycle events to reproduce the store’s full history.

Views borrow the store only for the callback. Copy any data you need to retain.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Set

A new record, changed explicit fields, or a changed effective app.

Fields

record: Record<'a>

The record after the complete store operation.

effective_app: Option<AppId<'a>>

The app resolved through the record and its remaining ancestors.

Remove(Record<'a>)

An old record, delivered before its removal.

Trait Implementations

impl<'a> Clone for Change<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Change<'a>

impl<'a> Debug for Change<'a>

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

Formats the value using the given formatter.