default impl for behaviour trait

1 files changed, 9 insertions, 3 deletions

diff --git a/src/sim/entity/mod.rs b/src/sim/entity/mod.rs
index c6c350e..555d2c6 100644
--- a/src/sim/entity/mod.rs
+++ b/src/sim/entity/mod.rs
@@ -46,14 +46,20 @@ impl Marchable for EntityCells {
 }
 
 pub trait EntityBehaviour {
-    fn update(&mut self, update_ctx: &mut EntityUpdateCtx, ctx: &mut SimCtx, delta_time: f32)
-    -> ();
+    fn update(
+        &mut self,
+        update_ctx: &mut EntityUpdateCtx,
+        ctx: &mut SimCtx,
+        delta_time: f32,
+    ) -> () {
+    }
     fn physics_update(
         &mut self,
         update_ctx: &mut EntityUpdateCtx,
         ctx: &mut SimCtx,
         delta_time: f32,
-    ) -> ();
+    ) -> () {
+    }
 }
 
 pub struct EntityDef {