refactor(ecs): make tuple reduce operation more generic

1 files changed, 10 insertions, 1 deletions

diff --git a/ecs/src/system.rs b/ecs/src/system.rs
index 6846a16..47872a6 100644
--- a/ecs/src/system.rs
+++ b/ecs/src/system.rs
@@ -186,13 +186,22 @@ pub struct NoInitParamFlag {}
 /// A type which can be used as input to a [`System`].
 pub trait Input: 'static {}
 
-impl<InputT: Input, Accumulator> TupleReduceElement<Accumulator> for InputT
+/// Component tuple reducing operation to get the parameters that takes input.
+pub struct ParamWithInputFilter;
+
+impl<InputT: Input, Accumulator> TupleReduceElement<Accumulator, ParamWithInputFilter>
+    for InputT
 where
     Accumulator: TupleWith<Self>,
 {
     type Return = Accumulator::With;
 }
 
+impl<Accumulator> TupleReduceElement<Accumulator, ParamWithInputFilter> for ()
+{
+    type Return = Accumulator;
+}
+
 #[derive(Debug)]
 pub struct ComponentRefMut<'a, ComponentT: Component>
 {