Struct Cell 

pub struct Cell<T> { /* private fields */ }

A displayed value together with its whole provenance.

Every field is private; the only way out is Cell::settled plus a match, so an absent value can never be read as a default. in_flight is orthogonal to settled rather than a fifth Settled arm, which is what lets a re-probing cell keep its previous value instead of blanking. settled being None while in_flight is false is a cell nothing has looked at yet, only reachable before the first Generation covers the entity.

Implementations

impl<T> Cell<T>

pub fn settled(&self) -> Option<&Settled<T>>

The settled state, or None while absent (loading, or never yet probed). The only way to a T.

pub fn is_in_flight(&self) -> bool

Whether a probe is running against this cell right now. A row’s summary treats in-flight as a property that outranks its least-settled Cell.

Trait Implementations

impl<T: Clone> Clone for Cell<T>

fn clone(&self) -> Cell<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for Cell<T>

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

Formats the value using the given formatter.

impl<T> Default for Cell<T>

fn default() -> Self

Returns the “default value” for a type.