add ref wrapper

kaminari/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "kaminari"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2021"
 authors = ["zephyr <[email protected]>"]
 keywords = ["lightws", "network"]

kaminari/src/lib.rs

@@ -30,3 +30,4 @@ pub mod nop;
 pub mod tls;
 pub mod mix;
 pub mod opt;
+pub mod trick;

kaminari/src/trick.rs

@@ -0,0 +1,35 @@
+use core::ops::Deref;
+
+// Safety:
+// pointer is not null once inited(comes from an immutable ref)
+// pointee memory is always valid during the eventloop
+pub struct Ref<T>(*const T);
+
+unsafe impl<T: Send + Sync> Send for Ref<T> {}
+unsafe impl<T: Send + Sync> Sync for Ref<T> {}
+
+impl<T> Copy for Ref<T> {}
+
+impl<T> Clone for Ref<T> {
+    fn clone(&self) -> Self { *self }
+}
+
+impl<T> Deref for Ref<T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target { unsafe { &*self.0 } }
+}
+
+impl<T> AsRef<T> for Ref<T> {
+    #[inline]
+    fn as_ref(&self) -> &T { unsafe { &*self.0 } }
+}
+
+impl<T> From<&T> for Ref<T> {
+    fn from(x: &T) -> Self { Ref(x as *const _) }
+}
+
+impl<T> Ref<T> {
+    pub const fn new(x: &T) -> Self { Self(x as *const _) }
+}