Struct Journal 

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

A journal that records operations as they are applied, enabling undo.

Implementations

impl<S> Journal<S>

pub fn new() -> Self

Create an empty journal.

pub fn apply(&mut self, op: Box<dyn Reversible<S>>, state: &mut S)

Apply an operation and record it.

pub fn undo(&mut self, state: &mut S) -> bool

Undo the last operation.

pub fn redo(&mut self, state: &mut S) -> bool

Redo the last undone operation.

pub fn undo_count(&self) -> usize

Number of operations that can be undone.

pub fn redo_count(&self) -> usize

Number of operations that can be redone.

pub fn clear(&mut self)

Clear all history.

Trait Implementations

impl<S> Debug for Journal<S>

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

Formats the value using the given formatter.

impl<S> Default for Journal<S>

fn default() -> Self

Returns the “default value” for a type.