all: split reusable components into workspace crates

utils/src/cell_ext.rs

@@ -0,0 +1,16 @@
+use {crate::ptr_ext::PtrExt, std::cell::Cell};
+
+pub trait CellExt {
+    fn is_some(&self) -> bool;
+    fn is_none(&self) -> bool;
+}
+
+impl<T> CellExt for Cell<Option<T>> {
+    fn is_some(&self) -> bool {
+        unsafe { self.as_ptr().deref().is_some() }
+    }
+
+    fn is_none(&self) -> bool {
+        !self.is_some()
+    }
+}