Added CellView type to limit where Cell value can be set from.

src/lib.rs

@@ -0,0 +1,15 @@
+#![no_std]
+
+use core::cell::Cell;
+
+/// Provides a view only reference to a [Cell].
+/// Useful alternative to `&Cell` when an API wants to control where a [Cell]s value can be set.
+#[derive(Copy, Clone)]
+pub struct CellView<'a, T: Copy>(&'a Cell<T>);
+
+impl<'a, T: Copy> CellView<'a, T> {
+    #[inline]
+    pub fn get(self) -> T {
+        self.0.get()
+    }
+}