chore(monorepo): delta, january, quark

crates/quark/src/util/value.rs

@@ -0,0 +1,38 @@
+/// Owned, Ref or None Value
+#[derive(Clone)]
+pub enum Value<'a, T> {
+    Owned(T),
+    Ref(&'a T),
+    None,
+}
+
+impl<'a, T> Value<'a, T> {
+    /// Check whether this Value exists
+    pub fn has(&self) -> bool {
+        !matches!(self, Self::None)
+    }
+
+    /// Get this Value as an Option Ref
+    pub fn get(&self) -> Option<&T> {
+        match self {
+            Self::Owned(t) => Some(t),
+            Self::Ref(t) => Some(t),
+            Self::None => None,
+        }
+    }
+
+    /// Set owned value
+    pub fn set(&mut self, t: T) {
+        *self = Value::Owned(t);
+    }
+
+    /// Set referential value
+    pub fn set_ref(&mut self, t: &'a T) {
+        *self = Value::Ref(t);
+    }
+
+    /// Clear current value
+    pub fn clear(&mut self) {
+        *self = Value::None;
+    }
+}