Struct VersionChain 

pub struct VersionChain<T> { /* private fields */ }

Version chain for a single key

Implementations

impl<T: Clone> VersionChain<T>

pub fn new() -> Self

pub fn add_version(&mut self, version: VersionedValue<T>)

Add a new version (prepends to front as newest)

pub fn latest(&self) -> Option<&VersionedValue<T>>

Get the latest version

pub fn version_at(&self, epoch: u64) -> Option<&VersionedValue<T>>

Get version visible at specific epoch (strict less-than for consistency with MVCC) Returns None if the key was deleted before the given epoch

pub fn gc(&mut self, watermark: u64) -> (usize, usize)

Clean up versions older than watermark Returns (versions_removed, bytes_freed estimate)

pub fn len(&self) -> usize

Number of versions in chain

pub fn is_empty(&self) -> bool

Trait Implementations

impl<T: Debug> Debug for VersionChain<T>

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

Formats the value using the given formatter.

impl<T: Clone> Default for VersionChain<T>

fn default() -> Self

Returns the “default value” for a type.