Struct ExtQueryMut 

pub struct ExtQueryMut<'w, T: 'static + Send + Sync, F: QueryFilter = ()> { /* private fields */ }

Builder for mutable extension queries.

Created by World::query_ext_mut(). Collects matching entity IDs upfront (keys snapshot) to avoid borrow conflicts, then provides for_each_mut for mutable iteration.

Implementations

impl<'w, T: 'static + Send + Sync, F: QueryFilter> ExtQueryMut<'w, T, F>

pub fn ids(&self) -> &[EntityId]

Entity IDs matching this query.

pub const fn count(&self) -> usize

Number of matching entities.

pub fn for_each_mut(&mut self, f: impl FnMut(EntityId, &mut T))

Apply a closure to each matching entity’s extension data mutably.