Function bones_ecs::entities::OptionalMut

pub fn OptionalMut<'a, T: HasSchema, C, S>(
    component_ref: &'a mut S
) -> OptionalQueryItemMut<'a, T, S>where
    C: ComponentIterBitset<'a, T> + 'a,
    S: DerefMut<Target = C> + 'a,

Helper func to construct a OptionalQueryItemMut wrapping a CompMut SystemParam. Used to iterate over enities optionally and mutably retrieving components from ComponentStore. Entities iterated over will not be filtered by this QueryItem.

This example filters entities by compC, optionally retrieves compA as mutable, and compB as immutable.

entities.iter_with(&mut OptionalMut(&mut compA), &Optional(&compB), &compC)

This will implement QueryItem as long as generic type implements std::ops::DerefMut for ComponentStore, such as CompMut.