From d10552031890ec09937d1b7a0dea1e68b0daf79a Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 5 Jul 2026 00:40:35 +0200
Subject: feat(engine): add try_write_new_to fn to enum variant reflection

---
 engine-reflection/Cargo.toml |  2 ++
 engine-reflection/src/lib.rs | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

(limited to 'engine-reflection')

diff --git a/engine-reflection/Cargo.toml b/engine-reflection/Cargo.toml
index 8e13728..2f90841 100644
--- a/engine-reflection/Cargo.toml
+++ b/engine-reflection/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+thiserror = "1.0.49"
+
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)]
-- 
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