Struct ShadowState 

pub struct ShadowState { /* private fields */ }

State with visible changes recorded on top of the parent state without actually modifying the parent state.

Implementations

impl ShadowState

pub fn new(parent: Arc<dyn StateR>) -> Self

pub fn take(&mut self) -> HashMap<Key, Option<Value>>

Takeout the changes recorded by ShadowState so the state becomes idential to its parent.

Trait Implementations

impl State for ShadowState

fn set(&mut self, key: Key, val: Option<Value>)

impl StateR for ShadowState

fn debug_iter<'a>(&'a self) -> Box<dyn Iterator<Item = (Key, Value)> + 'a>

This method is for debugging. If the implementation does not provide such functionality, it defaults to an empty iterator.

fn contains(&self, key: Key) -> bool

fn get(&self, key: Key) -> Option<Value>