Struct undo::Merged

pub struct Merged<R, C1: Command<R> + 'static, C2: Command<R> + 'static> { /* private fields */ }

The result of merging two commands.

The merge! macro can be used for convenience when merging commands.

Implementations

impl<R, C1: Command<R> + 'static, C2: Command<R> + 'static> Merged<R, C1, C2>

pub fn new(cmd1: C1, cmd2: C2) -> Merged<R, C1, C2>

Merges cmd1 and cmd2 into a single command.

pub fn into_commands(self) -> (C1, C2)

Returns the two merged commands.

Trait Implementations

impl<R, C1: Command<R> + 'static, C2: Command<R> + 'static> Command<R> for Merged<R, C1, C2>

fn apply(&mut self, receiver: &mut R) -> Result<(), Box<dyn Error + Send + Sync>>

Applies the command on the receiver and returns Ok if everything went fine, and Err if something went wrong.

fn undo(&mut self, receiver: &mut R) -> Result<(), Box<dyn Error + Send + Sync>>

Restores the state of the receiver as it was before the command was applied and returns Ok if everything went fine, and Err if something went wrong.

fn redo(&mut self, receiver: &mut R) -> Result<(), Box<dyn Error + Send + Sync>>

Reapplies the command on the receiver and return Ok if everything went fine, and Err if something went wrong.

fn merge(&self) -> Merge

Used for automatic merging of commands.

impl<R, C1: Command<R> + 'static, C2: Command<R> + 'static> Debug for Merged<R, C1, C2>

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

Formats the value using the given formatter.