Trait redo::Command

pub trait Command: Sized {
    type Target;
    type Error;
    fn apply(&mut self, target: &mut Self::Target) -> Result<Self>;
    fn undo(&mut self, target: &mut Self::Target) -> Result<Self>;

    fn redo(&mut self, target: &mut Self::Target) -> Result<Self> { ... }
    fn merge(&mut self, command: Self) -> Merge<Self> { ... }
}

Base functionality for all commands.

Associated Types

type Target

The target type.

type Error

The error type.

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Required methods

fn apply(&mut self, target: &mut Self::Target) -> Result<Self>

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

fn undo(&mut self, target: &mut Self::Target) -> Result<Self>

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

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Provided methods

fn redo(&mut self, target: &mut Self::Target) -> Result<Self>

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

The default implementation uses the apply implementation.

fn merge(&mut self, command: Self) -> Merge<Self>

Used for manual merging of commands.

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Implementors

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