implement readable and callable for all structs in the hooks crate

packages/signals/src/copy_value.rs

@@ -5,7 +5,6 @@ use generational_box::UnsyncStorage;
 use std::any::Any;
 use std::any::TypeId;
 use std::cell::RefCell;
-use std::mem::MaybeUninit;
 use std::ops::Deref;
 
 use dioxus_core::prelude::*;
@@ -268,31 +267,6 @@ impl<T: Copy, S: Storage<T>> Deref for CopyValue<T, S> {
     type Target = dyn Fn() -> T;
 
     fn deref(&self) -> &Self::Target {
-        // https://github.com/dtolnay/case-studies/tree/master/callable-types
-
-        // First we create a closure that captures something with the Same in memory layout as Self (MaybeUninit<Self>).
-        let uninit_callable = MaybeUninit::<Self>::uninit();
-        // Then move that value into the closure. We assume that the closure now has a in memory layout of Self.
-        let uninit_closure = move || *Self::read(unsafe { &*uninit_callable.as_ptr() });
-
-        // Check that the size of the closure is the same as the size of Self in case the compiler changed the layout of the closure.
-        let size_of_closure = std::mem::size_of_val(&uninit_closure);
-        assert_eq!(size_of_closure, std::mem::size_of::<Self>());
-
-        // Then cast the lifetime of the closure to the lifetime of &self.
-        fn cast_lifetime<'a, T>(_a: &T, b: &'a T) -> &'a T {
-            b
-        }
-        let reference_to_closure = cast_lifetime(
-            {
-                // The real closure that we will never use.
-                &uninit_closure
-            },
-            // We transmute self into a reference to the closure. This is safe because we know that the closure has the same memory layout as Self so &Closure == &Self.
-            unsafe { std::mem::transmute(self) },
-        );
-
-        // Cast the closure to a trait object.
-        reference_to_closure as &Self::Target
+        Readable::deref_impl(self)
     }
 }