1 files changed, 70 insertions, 0 deletions
diff --git a/engine-ecs/examples/with_local.rs b/engine-ecs/examples/with_local.rs
new file mode 100644
index 0000000..2c04f26
--- /dev/null
+++ b/engine-ecs/examples/with_local.rs
@@ -0,0 +1,70 @@
+use engine_ecs::component::local::Local;
+use engine_ecs::phase::UPDATE as UPDATE_PHASE;
+use engine_ecs::system::initializable::Initializable;
+use engine_ecs::system::Into;
+use engine_ecs::{Component, Query, World};
+
+#[derive(Component)]
+struct SomeData
+{
+    num: u64,
+}
+
+#[derive(Component)]
+struct Name
+{
+    name: String,
+}
+
+#[derive(Component)]
+struct SayHelloState
+{
+    cnt: usize,
+}
+
+fn say_hello(query: Query<(&SomeData,)>, mut state: Local<SayHelloState>)
+{
+    for (data,) in &query {
+        println!("Hello there. Count {}: {}", state.cnt, data.num);
+
+        state.cnt += 1;
+    }
+}
+
+fn say_whats_up(query: Query<(&SomeData, &Name)>, mut state: Local<SayHelloState>)
+{
+    for (data, name) in &query {
+        println!(
+            "Whats up, {}. Number is {}. Count {}",
+            name.name, data.num, state.cnt
+        );
+
+        state.cnt += 1;
+    }
+}
+
+fn main()
+{
+    let mut world = World::new();
+
+    world.register_system(
+        *UPDATE_PHASE,
+        say_hello
+            .into_system()
+            .initialize((SayHelloState { cnt: 0 },)),
+    );
+
+    world.register_system(
+        *UPDATE_PHASE,
+        say_whats_up
+            .into_system()
+            .initialize((SayHelloState { cnt: 0 },)),
+    );
+
+    world.create_entity((SomeData { num: 987_654 }, Name { name: "Bob".to_string() }));
+
+    world.create_entity((SomeData { num: 345 },));
+
+    world.step();
+    world.step();
+}