Struct CursorHistory 

pub struct CursorHistory<'storage> { /* private fields */ }

Cleanup-owning exact cursor history used for cycle and collision checks.

Each entry stores both the caller digest and exact cursor bytes. Equal digests with unequal bytes fail as collisions; equal bytes with another digest also fail closed. This type is intentionally neither Copy nor Clone.

Implementations

impl<'storage> CursorHistory<'storage>

pub fn new( storage: &'storage mut [u8], max_entries: u32, ) -> Result<Self, PaginationError>

Creates empty history in caller-owned cleanup storage.

pub fn observe( &mut self, cursor: &PaginationCursor<'_>, digest: CursorDigest, ) -> Result<(), PaginationError>

Checks and transactionally records one cursor and digest.

pub const fn entries(&self) -> u32

Returns the number of recorded cursors.

Trait Implementations

impl Debug for CursorHistory<'_>

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

Formats the value using the given formatter.

impl Drop for CursorHistory<'_>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

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

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.