Components as entities

benches/benches/bevy_ecs/empty_archetypes.rs

@@ -166,7 +166,6 @@ fn empty_archetypes(criterion: &mut Criterion) {
             schedule.add_systems(iter);
         });
         add_archetypes(&mut world, archetype_count);
-        world.clear_entities();
         let mut e = world.spawn_empty();
         e.insert(A::<0>(1.0));
         e.insert(A::<1>(1.0));
@@ -197,7 +196,6 @@ fn empty_archetypes(criterion: &mut Criterion) {
             schedule.add_systems(for_each);
         });
         add_archetypes(&mut world, archetype_count);
-        world.clear_entities();
         let mut e = world.spawn_empty();
         e.insert(A::<0>(1.0));
         e.insert(A::<1>(1.0));
@@ -228,7 +226,6 @@ fn empty_archetypes(criterion: &mut Criterion) {
             schedule.add_systems(par_for_each);
         });
         add_archetypes(&mut world, archetype_count);
-        world.clear_entities();
         let mut e = world.spawn_empty();
         e.insert(A::<0>(1.0));
         e.insert(A::<1>(1.0));

benches/benches/bevy_ecs/main.rs

@@ -23,6 +23,7 @@ criterion_main!(
     bundles::benches,
     change_detection::benches,
     components::benches,
+    resources::benches,
     empty_archetypes::benches,
     entity_cloning::benches,
     events::benches,

crates/bevy_ecs/src/component/constants.rs

@@ -1,14 +1,14 @@
 //! Constant components included in every world.
 
-/// `usize` for the [`Add`](crate::lifecycle::Add) component used in lifecycle observers.
-pub const ADD: usize = 0;
-/// `usize` for the [`Insert`](crate::lifecycle::Insert) component used in lifecycle observers.
-pub const INSERT: usize = 1;
-/// `usize` for the [`Discard`](crate::lifecycle::Discard) component used in lifecycle observers.
-pub const DISCARD: usize = 2;
-/// `usize` for the [`Remove`](crate::lifecycle::Remove) component used in lifecycle observers.
-pub const REMOVE: usize = 3;
-/// `usize` for [`Despawn`](crate::lifecycle::Despawn) component used in lifecycle observers.
-pub const DESPAWN: usize = 4;
-/// `usize` of the [`IsResource`](crate::resource::IsResource) component used to mark entities with resources.
-pub const IS_RESOURCE: usize = 5;
+/// `u32` for the [`Add`](crate::lifecycle::Add) component used in lifecycle observers.
+pub const ADD: u32 = 0;
+/// `u32` for the [`Insert`](crate::lifecycle::Insert) component used in lifecycle observers.
+pub const INSERT: u32 = 1;
+/// `u32` for the [`Discard`](crate::lifecycle::Discard) component used in lifecycle observers.
+pub const DISCARD: u32 = 2;
+/// `u32` for the [`Remove`](crate::lifecycle::Remove) component used in lifecycle observers.
+pub const REMOVE: u32 = 3;
+/// `u32` for [`Despawn`](crate::lifecycle::Despawn) component used in lifecycle observers.
+pub const DESPAWN: u32 = 4;
+/// `u32` of the [`IsResource`](crate::resource::IsResource) component used to mark entities with resources.
+pub const IS_RESOURCE: u32 = 5;