Struct Col 

pub struct Col<'w, T: 'static> {
    cells: &'w [UnsafeCell<T>],
}

A claimed column, shared.

Handed out by PlanBuilder::read and kept in a query’s plan. It is Copy, because reading a column twice is not a conflict.

Fields

cells: &'w [UnsafeCell<T>]

Implementations

impl<'w, T: 'static> Col<'w, T>

pub fn at(&self, row: usize) -> &'w T

The value at row.

It lives as long as the claim behind it, so nothing writes the column while any item names it.

pub fn len(&self) -> usize

The number of values in the column, one per row of the archetype.

pub fn is_empty(&self) -> bool

Whether the column holds no value.

Trait Implementations

impl<T: 'static> Clone for Col<'_, T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: 'static> Copy for Col<'_, T>