Trait undo::Action[−][src]

pub trait Action {
    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, _: &mut Self) -> Merged { ... }
}

Base functionality for all actions.

Associated Types

type Target[src]

The target type.

type Error[src]

The error type.

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Required methods

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

Applies the action 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>[src]

Restores the state of the target as it was before the action 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>[src]

Reapplies the action 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, _: &mut Self) -> Merged[src]

Used for manual merging of actions.

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Implementors

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