refactor(ecs): add system trait

1 files changed, 7 insertions, 30 deletions

diff --git a/ecs/src/lib.rs b/ecs/src/lib.rs
index f824ebc..6106862 100644
--- a/ecs/src/lib.rs
+++ b/ecs/src/lib.rs
@@ -8,8 +8,10 @@ use std::marker::PhantomData;
 use std::slice::IterMut as SliceIterMut;
 
 use crate::component::{Component, Sequence as ComponentSequence};
+use crate::system::{System, TypeErased as TypeErasedSystem};
 
 pub mod component;
+pub mod system;
 
 #[derive(Debug)]
 struct Entity
@@ -20,7 +22,7 @@ struct Entity
 #[derive(Debug)]
 pub struct World<Event>
 {
-    systems: Vec<Box<dyn AnySystem>>,
+    systems: Vec<TypeErasedSystem>,
     events: HashMap<Event, Vec<usize>>,
     component_storage: ComponentStorage,
 }
@@ -46,12 +48,12 @@ impl<Event> World<Event>
             .push(Entity { components: components.into_vec() });
     }
 
-    pub fn register_system<Comps>(&mut self, event: Event, system: System<Comps>)
+    pub fn register_system<TSystem, SystemImpl>(&mut self, event: Event, system: TSystem)
     where
         Event: Hash + PartialEq + Eq,
-        Comps: ComponentSequence + 'static,
+        TSystem: System<SystemImpl>,
     {
-        self.systems.push(Box::new(system));
+        self.systems.push(system.into_type_erased());
 
         self.events
             .entry(event)
@@ -75,7 +77,7 @@ impl<Event> World<Event>
         for system_index in system_indices {
             let system = self.systems.get_mut(system_index).unwrap();
 
-            system.call(&mut self.component_storage);
+            system.run(&mut self.component_storage);
         }
     }
 
@@ -95,31 +97,6 @@ impl<Event> Default for World<Event>
     }
 }
 
-pub type System<Comps> = fn(Query<Comps>);
-
-trait AnySystem
-{
-    fn call(&self, component_storage: &mut ComponentStorage);
-}
-
-impl<Comps> AnySystem for System<Comps>
-where
-    Comps: ComponentSequence,
-{
-    fn call(&self, component_storage: &mut ComponentStorage)
-    {
-        self(Query::new(component_storage));
-    }
-}
-
-impl Debug for dyn AnySystem
-{
-    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
-    {
-        formatter.debug_struct("AnySystem").finish_non_exhaustive()
-    }
-}
-
 #[derive(Debug)]
 pub struct Query<'world, Comps>
 {