Struct Column 

pub struct Column<T: 'static> {
    cells: Vec<UnsafeCell<T>>,
}

One component type’s values inside one archetype.

Each value sits in its own cell, so a query may hold the components of two entities at once. A row’s cell index is the row number and never changes while the row exists.

Fields

cells: Vec<UnsafeCell<T>>

Implementations

impl<T: 'static> Column<T>

pub(crate) fn new() -> Self

An empty column.

pub(crate) fn eraser() -> fn() -> Box<dyn AnyColumn>

A function that builds an empty column of this component type.

pub(crate) fn cells(&self) -> &[UnsafeCell<T>]

Every cell of the column, one per row.

Handing out the slice is safe; taking the value out of a cell needs the claim the caller took on the column. See crate::borrow.

pub(crate) fn cells_mut(&mut self) -> &mut [UnsafeCell<T>]

Every cell of the column, reached exclusively.

pub(crate) fn erase(self) -> Box<dyn AnyColumn>

Erase the column.

Trait Implementations

impl<T: 'static> AnyColumn for Column<T>

fn as_any(&self) -> &dyn Any

Downcast support.

fn as_any_mut(&mut self) -> &mut dyn Any

Downcast support for a column reached exclusively.

fn swap_remove(&mut self, row: usize) -> Box<dyn Any>

Move the value at row out, filling the hole with the last value.

fn push_boxed(&mut self, value: Box<dyn Any>)

Append an already erased value of this column’s component type.