SENSORS

src/layout/widget.rs

@@ -16,6 +16,7 @@ pub struct AnyWidget;
 ///
 /// W does not need to implement widget so that AnyWidget is valid;
 /// Instead, add generic bounds on methods that take an ID if they need specific data.
+#[repr(C)]
 #[derive(Eq, Hash, PartialEq, Debug)]
 pub struct WidgetId<W = AnyWidget> {
     pub(super) ty: TypeId,
@@ -38,10 +39,16 @@ impl<W> WidgetId<W> {
             _pd: PhantomData,
         }
     }
+
     pub fn erase_type(self) -> WidgetId<AnyWidget> {
         self.cast_type()
     }
 
+    pub fn as_any(&self) -> &WidgetId<AnyWidget> {
+        // safety: self is repr(C) and generic only used for phantom data
+        unsafe { std::mem::transmute(self) }
+    }
+
     fn cast_type<W2>(self) -> WidgetId<W2> {
         WidgetId {
             ty: self.ty,