feat(engine): add try_write_new_to fn to enum variant reflection

1 files changed, 21 insertions, 0 deletions

diff --git a/engine-reflection/src/lib.rs b/engine-reflection/src/lib.rs
index 9f347fa..3451442 100644
--- a/engine-reflection/src/lib.rs
+++ b/engine-reflection/src/lib.rs
@@ -177,6 +177,27 @@ pub struct EnumVariant
     pub fields: Option<EnumVariantFields>,
 
     pub discriminant: EnumDiscriminant,
+
+    pub try_write_new_to: fn(
+        dst: &mut dyn Any,
+        fields: &mut dyn Iterator<Item = Box<dyn Any>>,
+    ) -> Result<(), EnumVariantWriteNewToError>,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum EnumVariantWriteNewToError
+{
+    #[error("Destination must be the same type as the variant's enum")]
+    WrongDstType,
+
+    #[error("Too few fields are specified")]
+    TooFewFields,
+
+    #[error("Too many fields are specified")]
+    TooManyFields,
+
+    #[error("A field has the wrong type")]
+    WrongFieldType,
 }
 
 #[derive(Debug, Clone)]