From 28f7ce3d4305d45293b371e1d66431a2e42053bf Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sat, 13 Sep 2025 15:16:01 +0200
Subject: feat(ecs): add add_observer fn to extension::Collector

---
 ecs/src/extension.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'ecs/src')

diff --git a/ecs/src/extension.rs b/ecs/src/extension.rs
index e180ac7..9c6614b 100644
--- a/ecs/src/extension.rs
+++ b/ecs/src/extension.rs
@@ -1,6 +1,7 @@
 use crate::component::Sequence as ComponentSequence;
 use crate::entity::Declaration as EntityDeclaration;
 use crate::sole::Sole;
+use crate::system::observer::Observer;
 use crate::system::System;
 use crate::uid::Uid;
 use crate::{SoleAlreadyExistsError, World};
@@ -35,6 +36,15 @@ impl<'world> Collector<'world>
         self.world.register_system(phase_euid, system);
     }
 
+    /// Adds a observer system to the [`World`].
+    pub fn add_observer<'this, SystemImpl>(
+        &'this mut self,
+        observer: impl Observer<'this, SystemImpl>,
+    )
+    {
+        self.world.register_observer(observer);
+    }
+
     /// Adds a entity to the [`World`].
     pub fn add_entity<Comps>(&mut self, components: Comps)
     where
-- 
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