Trait redo::Command

pub trait Command<R> {
    type Err;
    fn redo(&mut self, receiver: &mut R) -> Result<(), Self::Err>;
    fn undo(&mut self, receiver: &mut R) -> Result<(), Self::Err>;

    fn merge(&mut self, cmd: Self) -> Result<(), Self>
    where
        Self: Sized,
    { ... }
}

Base functionality for all commands.

Associated Types

type Err

The error type.

Required Methods

fn redo(&mut self, receiver: &mut R) -> Result<(), Self::Err>

Executes the desired command and returns Ok if everything went fine, and Err if something went wrong.

fn undo(&mut self, receiver: &mut R) -> Result<(), Self::Err>

Restores the state as it was before redo was called and returns Ok if everything went fine, and Err if something went wrong.

Provided Methods

fn merge(&mut self, cmd: Self) -> Result<(), Self> where
    Self: Sized, 

Used for manual merging of two Commands.

Returns Ok if commands was merged and Err(cmd) if not.

Implementors