Struct add_ed::Line

pub struct Line {
    pub tag: Rc<Cell<char>>,
    pub text: Rc<String>,
    /* private fields */
}

Text data and metadata for a single line of text

Note the Rc<Cell>s placed around internal variables we wish to share between points in history while allowing modification, both in that Rc and without &mut access to the line. This is to let [History] enforce use of [History::current_mut] to edit the text, while allowing changes to other data using [History::current] (which doesn’t create undo snapshots).

Fields

tag: Rc<Cell<char>>

The tag set on the given line

It is stored in an Rc to have a shared overwriteable tag for all historical instances of the line.

text: Rc<String>

The text data for a given line

It is stored in an Rc as a CoW mechanism, since it allows a shared allocation for historical states with the same text data while preventing modification of that shared state. To modify, create a new String with the data you want and put it in a new Rc in this field.

Trait Implementations

impl Debug for Line

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

Formats the value using the given formatter.

impl From<&Line> for PubLine

fn from(l: &Line) -> Self

Converts to this type from the input type.

impl From<&PubLine> for Line

fn from(l: &PubLine) -> Self

Converts to this type from the input type.

impl From<&str> for Line

fn from(l: &str) -> Self

Converts to this type from the input type.

impl PartialEq<Line> for Line

fn eq(&self, other: &Line) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Line

impl StructuralEq for Line

impl StructuralPartialEq for Line