Vendor things

third-party/vendor/objc2/src/rc/allocated.rs

@@ -0,0 +1,15 @@
+/// A marker type that can be used within [`Id`] to indicate that the object
+/// has been allocated but not initialized.
+///
+/// The reason we use `Option<Id<Allocated<T>, O>>` instead of just `*mut T`
+/// is:
+/// - To allow releasing allocated objects, e.g. in the face of panics.
+/// - To safely know the object is valid (albeit uninitialized).
+/// - To allow specifying ownership.
+///
+/// [`Id`]: crate::rc::Id
+#[repr(transparent)]
+#[derive(Debug)]
+pub struct Allocated<T: ?Sized>(T);
+
+// Explicitly don't implement `Deref`, `Message` nor `RefEncode`!