all: add (Clone)Cell::is_some and is_none

src/utils/cell_ext.rs

@@ -0,0 +1,16 @@
+use std::cell::Cell;
+
+pub trait CellExt {
+    fn is_some(&self) -> bool;
+    fn is_none(&self) -> bool;
+}
+
+impl<T: Copy> CellExt for Cell<Option<T>> {
+    fn is_some(&self) -> bool {
+        self.get().is_some()
+    }
+
+    fn is_none(&self) -> bool {
+        self.get().is_none()
+    }
+}

src/utils/clonecell.rs

@@ -59,6 +59,19 @@ impl<T> CloneCell<T> {
     }
 }
 
+impl<T> CloneCell<Option<T>> {
+    #[inline(always)]
+    pub fn is_some(&self) -> bool {
+        unsafe { self.data.get().deref().is_some() }
+    }
+
+    #[inline(always)]
+    #[allow(dead_code)]
+    pub fn is_none(&self) -> bool {
+        unsafe { self.data.get().deref().is_none() }
+    }
+}
+
 impl<T: Default> Default for CloneCell<T> {
     fn default() -> Self {
         Self::new(Default::default())