Struct design_pattern_examples_rust::memento::memento_textobject::Memento

pub struct Memento {
    name: String,
    text: String,
}

Represents a single memento (snapshot) of the text state before an operation is applied. The operation becomes the name of the memento for display purposes.

Fields

name: String

The name of this memento (really just the name of the operation that triggered the need for this memento).

text: String

The snapshot of the text data as stored in the MementoTextObject struct instance.

Implementations

impl Memento

fn new(name: &str, text: &str) -> Memento

Constructor.

Parameters

• name

  The name of the memento to create

• text

  The data to be saved in the memento

Returns

Returns a new instance of the Memento struct.

fn text(&self) -> &str

The saved text in this memento. This is accessible only by the MementoTextObject struct since it is the only entity that knows what to do with the text during an undo.

pub fn name(&self) -> &str

The name of the memento (snapshot). Useful for displaying a list of mementos in an undo list. In this case, the name of each memento is the operation that triggered the creation of the memento.