initial

Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "maybe_owned"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

src/lib.rs

@@ -0,0 +1,22 @@
+pub enum MaybeOwned<'a, T: 'a> {
+    Owned(T),
+    Borrowed(&'a T),
+}
+
+impl<'a, T: 'a> From<T> for MaybeOwned<'a, T> {
+    fn from(value: T) -> Self {
+        Self::Owned(value)
+    }
+}
+
+impl<'a, T: 'a> From<&'a T> for MaybeOwned<'a, T> {
+    fn from(value: &'a T) -> Self {
+        Self::Borrowed(value)
+    }
+}
+
+impl<'a, T: 'a + Default> Default for MaybeOwned<'a, T> {
+    fn default() -> Self {
+        MaybeOwned::Owned(T::default())
+    }
+}