feat: OnDropWith helper

rtic-common/src/dropper.rs

@@ -1,5 +1,9 @@
 //! A drop implementation runner.
 
+use core::ops::{Deref, DerefMut};
+
+pub(crate) struct OnDropWith<T, F: FnMut(&mut T)>(T, F);
+
 /// Runs a closure on drop.
 pub struct OnDrop<F: FnOnce()> {
     f: core::mem::MaybeUninit<F>,
@@ -24,3 +28,33 @@ impl<F: FnOnce()> Drop for OnDrop<F> {
         unsafe { self.f.as_ptr().read()() }
     }
 }
+
+impl<T, F: FnMut(&mut T)> OnDropWith<T, F> {
+    pub(crate) fn new(value: T, f: F) -> Self {
+        Self(value, f)
+    }
+
+    pub(crate) fn execute(&mut self) {
+        (self.1)(&mut self.0);
+    }
+}
+
+impl<T, F: FnMut(&mut T)> Deref for OnDropWith<T, F> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T, F: FnMut(&mut T)> DerefMut for OnDropWith<T, F> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl<T, F: FnMut(&mut T)> Drop for OnDropWith<T, F> {
+    fn drop(&mut self) {
+        self.execute();
+    }
+}