From 46504f64f24e265688ba21100a7e317c91416a50 Mon Sep 17 00:00:00 2001
From: Janis <janis@nirgendwo.xyz>
Date: Tue, 17 Jun 2025 14:44:55 +0200
Subject: [PATCH] latchref and nopref types

---
 src/lib.rs | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 5bea4f0..f609657 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -163,6 +163,7 @@ pub mod task {
 }
 
 pub mod latch {
+    use core::marker::PhantomData;
     use std::{
         sync::{
             atomic::{AtomicBool, AtomicUsize, Ordering},
@@ -283,6 +284,48 @@ pub mod latch {
         }
     }
 
+    pub struct LatchRef<'a, L: Latch> {
+        inner: *const L,
+        _marker: PhantomData<&'a L>,
+    }
+
+    impl<'a, L: Latch> LatchRef<'a, L> {
+        #[inline]
+        pub const fn new(latch: &'a L) -> Self {
+            Self {
+                inner: latch,
+                _marker: PhantomData,
+            }
+        }
+    }
+
+    impl<'a, L: Latch> Latch for LatchRef<'a, L> {
+        #[inline]
+        unsafe fn set_raw(this: *const Self) {
+            let this = &*this;
+            Latch::set_raw(this.inner);
+        }
+    }
+
+    impl<'a, L: Latch + Probe> Probe for LatchRef<'a, L> {
+        #[inline]
+        fn probe(&self) -> bool {
+            unsafe {
+                let this = &*self.inner;
+                Probe::probe(this)
+            }
+        }
+    }
+
+    pub struct NopLatch;
+
+    impl Latch for NopLatch {
+        #[inline]
+        unsafe fn set_raw(_this: *const Self) {
+            // do nothing
+        }
+    }
+
     pub struct MutexLatch {
         mutex: Mutex<bool>,
         signal: Condvar,