Function bevy::prelude::run_on_hierarchy

pub fn run_on_hierarchy<T, S>(
    children_query: &Query<'_, &Children>, 
    state: &mut S, 
    entity: Entity, 
    parent_result: Option<T>, 
    previous_result: Option<T>, 
    run: &mut dyn FnMut(&mut S, Entity, Option<T>, Option<T>)
) -> Option<T> where
    T: Clone,