Struct Column 

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

The storage of one component type: entity -> value, ordered by entity. Each value is a shared handle: a clone of the column (of the world) shares every value with it, and writing a value that is shared copies it first, so neither side sees the other’s writes (Column::get_shared).

Implementations

impl<T> Column<T>

pub fn get(&self, e: Entity) -> Option<&T>

pub fn get_shared(&self, e: Entity) -> Option<Arc<T>>

e’s value as a shared handle: the column’s own, not a copy. A later write through the column copies the value first, so the handle keeps what it was given.

pub fn contains(&self, e: Entity) -> bool

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn iter( &self, ) -> impl DoubleEndedIterator<Item = (Entity, &T)> + ExactSizeIterator

Entities and values in ascending entity order.

pub fn entities( &self, ) -> impl DoubleEndedIterator<Item = Entity> + ExactSizeIterator + '_

impl<T: Clone> Column<T>

pub fn get_mut(&mut self, e: Entity) -> Option<&mut T>

e’s value to write: a value another clone of the column still shares is copied first.

pub fn iter_mut( &mut self, ) -> impl DoubleEndedIterator<Item = (Entity, &mut T)> + ExactSizeIterator

Every value to write, in ascending entity order: each one still shared is copied first.

Trait Implementations

impl<T: Clone> Clone for Column<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: Debug> Debug for Column<T>

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

Formats the value using the given formatter.

impl<T> Default for Column<T>

fn default() -> Self

Returns the “default value” for a type.