From 613cd7129439d04f576325bcf55d276847efb136 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 24 Jul 2022 11:02:33 +0200
Subject: refactor: clean up intertrait lib

---
 src/libs/intertrait/mod.rs | 71 +++++++++++++++++++++-------------------------
 1 file changed, 32 insertions(+), 39 deletions(-)

(limited to 'src/libs/intertrait/mod.rs')

diff --git a/src/libs/intertrait/mod.rs b/src/libs/intertrait/mod.rs
index 1daca64..2cdc67d 100644
--- a/src/libs/intertrait/mod.rs
+++ b/src/libs/intertrait/mod.rs
@@ -12,64 +12,62 @@
  * at your option.
 */
 use std::any::{Any, TypeId};
-use std::collections::HashMap;
 use std::rc::Rc;
-use std::sync::Arc;
 
+use ahash::AHashMap;
 use linkme::distributed_slice;
 use once_cell::sync::Lazy;
 
-mod hasher;
-
-use hasher::BuildFastHasher;
-
 pub mod cast_box;
 pub mod cast_rc;
 
 pub type BoxedCaster = Box<dyn Any + Send + Sync>;
 
+type CasterFn = fn() -> (TypeId, BoxedCaster);
+
 #[distributed_slice]
-pub static CASTERS: [fn() -> (TypeId, BoxedCaster)] = [..];
-
-static CASTER_MAP: Lazy<HashMap<(TypeId, TypeId), BoxedCaster, BuildFastHasher>> =
-    Lazy::new(|| {
-        CASTERS
-            .iter()
-            .map(|f| {
-                let (type_id, caster) = f();
-                ((type_id, (*caster).type_id()), caster)
-            })
-            .collect()
-    });
-
-pub struct Caster<T: ?Sized + 'static>
+pub static CASTERS: [CasterFn] = [..];
+
+static CASTER_MAP: Lazy<AHashMap<(TypeId, TypeId), BoxedCaster>> = Lazy::new(|| {
+    CASTERS
+        .iter()
+        .map(|caster_fn| {
+            let (type_id, caster) = caster_fn();
+
+            ((type_id, (*caster).type_id()), caster)
+        })
+        .collect()
+});
+
+pub struct Caster<Trait: ?Sized + 'static>
 {
     /// Casts a `Box` holding a trait object for `Any` to another `Box` holding a trait object
-    /// for trait `T`.
-    pub cast_box: fn(from: Box<dyn Any>) -> Box<T>,
+    /// for `Trait`.
+    pub cast_box: fn(from: Box<dyn Any>) -> Box<Trait>,
 
     /// Casts an `Rc` holding a trait object for `Any` to another `Rc` holding a trait object
-    /// for trait `T`.
-    pub cast_rc: fn(from: Rc<dyn Any>) -> Rc<T>,
+    /// for `Trait`.
+    pub cast_rc: fn(from: Rc<dyn Any>) -> Rc<Trait>,
 }
 
-impl<T: ?Sized + 'static> Caster<T>
+impl<Trait: ?Sized + 'static> Caster<Trait>
 {
     pub fn new(
-        cast_box: fn(from: Box<dyn Any>) -> Box<T>,
-        cast_rc: fn(from: Rc<dyn Any>) -> Rc<T>,
-    ) -> Caster<T>
+        cast_box: fn(from: Box<dyn Any>) -> Box<Trait>,
+        cast_rc: fn(from: Rc<dyn Any>) -> Rc<Trait>,
+    ) -> Caster<Trait>
     {
-        Caster::<T> { cast_box, cast_rc }
+        Caster::<Trait> { cast_box, cast_rc }
     }
 }
 
-/// Returns a `Caster<S, T>` from a concrete type `S` to a trait `T` implemented by it.
-fn caster<T: ?Sized + 'static>(type_id: TypeId) -> Option<&'static Caster<T>>
+/// Returns a `Caster<Implementation, Trait>` from a concrete type `Implementation`
+/// from inside `CASTER_MAP` to a `Trait` implemented by it.
+fn caster<Trait: ?Sized + 'static>(type_id: TypeId) -> Option<&'static Caster<Trait>>
 {
     CASTER_MAP
-        .get(&(type_id, TypeId::of::<Caster<T>>()))
-        .and_then(|caster| caster.downcast_ref::<Caster<T>>())
+        .get(&(type_id, TypeId::of::<Caster<Trait>>()))
+        .and_then(|caster| caster.downcast_ref::<Caster<Trait>>())
 }
 
 /// `CastFrom` must be extended by a trait that wants to allow for casting into another trait.
@@ -92,12 +90,7 @@ pub trait CastFrom: Any + 'static
     fn rc_any(self: Rc<Self>) -> Rc<dyn Any>;
 }
 
-pub trait CastFromSync: CastFrom + Sync + Send + 'static
-{
-    fn arc_any(self: Arc<Self>) -> Arc<dyn Any + Sync + Send + 'static>;
-}
-
-impl<T: Sized + Any + 'static> CastFrom for T
+impl<Trait: Sized + Any + 'static> CastFrom for Trait
 {
     fn box_any(self: Box<Self>) -> Box<dyn Any>
     {
-- 
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