Struct UndoStack 

pub struct UndoStack<S> { /* private fields */ }

Generic undo stack for storing state snapshots.

Stores clones of state snapshots. Popped snapshots are returned directly since they are already detached.

Implementations

impl<S: Clone> UndoStack<S>

pub fn new() -> Self

pub fn push(&mut self, state: &S)

Push a clone of the given state onto the stack.

pub fn pop(&mut self) -> Option<S>

Pop and return the most recent snapshot, or None if empty.

pub fn clear(&mut self)

Remove all snapshots.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

Trait Implementations

impl<S: Clone> Clone for UndoStack<S>

fn clone(&self) -> UndoStack<S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug> Debug for UndoStack<S>

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

Formats the value using the given formatter.

impl<S: Default> Default for UndoStack<S>

fn default() -> UndoStack<S>

Returns the “default value” for a type.