feat(ecs): add iterating over queries non-mutably

3 files changed, 10 insertions, 10 deletions

diff --git a/ecs/examples/multiple_queries.rs b/ecs/examples/multiple_queries.rs
index 4f4198a..9a699c2 100644
--- a/ecs/examples/multiple_queries.rs
+++ b/ecs/examples/multiple_queries.rs
@@ -29,12 +29,12 @@ impl Display for EnemyName
     }
 }
 
-fn say_hello(
-    mut query: Query<(AttackStrength,)>,
+fn do_attacks(
+    attacker_query: Query<(AttackStrength,)>,
     mut enemy_query: Query<(Health, EnemyName)>,
 )
 {
-    for (attack_strength,) in query.iter_mut() {
+    for (attack_strength,) in &attacker_query {
         for (health, enemy_name) in enemy_query.iter_mut() {
             let damage = match attack_strength {
                 AttackStrength::Strong => 20,
@@ -66,7 +66,7 @@ fn main()
 {
     let mut world = World::<Event>::new();
 
-    world.register_system(Event::Start, say_hello);
+    world.register_system(Event::Start, do_attacks);
 
     world.create_entity((
         Health { health: 100 },
diff --git a/ecs/examples/simple.rs b/ecs/examples/simple.rs
index b8dc50f..76d9538 100644
--- a/ecs/examples/simple.rs
+++ b/ecs/examples/simple.rs
@@ -12,9 +12,9 @@ struct Greeting
     greeting: String,
 }
 
-fn say_hello(mut query: Query<(SomeData, Greeting)>)
+fn say_hello(query: Query<(SomeData, Greeting)>)
 {
-    for (data, greeting) in query.iter_mut() {
+    for (data, greeting) in &query {
         println!("{}: {}", greeting.greeting, data.num);
     }
 }
diff --git a/ecs/examples/with_local.rs b/ecs/examples/with_local.rs
index 334f129..b37a5c3 100644
--- a/ecs/examples/with_local.rs
+++ b/ecs/examples/with_local.rs
@@ -20,18 +20,18 @@ struct SayHelloState
     cnt: usize,
 }
 
-fn say_hello(mut query: Query<(SomeData,)>, mut state: Local<SayHelloState>)
+fn say_hello(query: Query<(SomeData,)>, mut state: Local<SayHelloState>)
 {
-    for (data,) in query.iter_mut() {
+    for (data,) in &query {
         println!("Hello there. Count {}: {}", state.cnt, data.num);
 
         state.cnt += 1;
     }
 }
 
-fn say_whats_up(mut query: Query<(SomeData, Name)>, mut state: Local<SayHelloState>)
+fn say_whats_up(query: Query<(SomeData, Name)>, mut state: Local<SayHelloState>)
 {
-    for (data, name) in query.iter_mut() {
+    for (data, name) in &query {
         println!(
             "Whats up, {}. Number is {}. Count {}",
             name.name, data.num, state.cnt