refactor(ecs): add struct for querying using component metadata

1 files changed, 8 insertions, 3 deletions

diff --git a/ecs/src/component.rs b/ecs/src/component.rs
index 4d37cb8..35e5430 100644
--- a/ecs/src/component.rs
+++ b/ecs/src/component.rs
@@ -180,7 +180,9 @@ pub trait RefSequence
 {
     type Handles<'component>;
 
-    fn metadata() -> impl Array<Metadata>;
+    type Metadata: Array<Metadata>;
+
+    fn metadata() -> Self::Metadata;
 
     fn from_components<'component>(
         components: &'component [EntityComponent],
@@ -330,7 +332,9 @@ macro_rules! inner {
             {
                 type Handles<'component> = (#(CompRef~I::Handle<'component>,)*);
 
-                fn metadata() -> impl Array<Metadata>
+                type Metadata = [Metadata; $c + 1];
+
+                fn metadata() -> Self::Metadata
                 {
                     [#(
                         Metadata {
@@ -397,8 +401,9 @@ impl Sequence for ()
 impl RefSequence for ()
 {
     type Handles<'component> = ();
+    type Metadata = [Metadata; 0];
 
-    fn metadata() -> impl Array<Metadata>
+    fn metadata() -> Self::Metadata
     {
         []
     }