Fix dart8 tag component deserialization (#2236)

jslee02 · web-flow · commit 67c78d22f546 · 2025-11-22T03:37:58.000-08:00
diff --git a/dart8/io/serializer.hpp b/dart8/io/serializer.hpp
@@ -227,7 +227,12 @@ class TypedComponentSerializer : public ComponentSerializer
   {
     ComponentT component;
     loadComponent(in, component);
-    registry.emplace<ComponentT>(entity, std::move(component));
+    if constexpr (std::is_empty_v<ComponentT>) {
+      // Tag components in EnTT must be emplaced without constructor args
+      registry.emplace<ComponentT>(entity);
+    } else {
+      registry.emplace<ComponentT>(entity, std::move(component));
+    }
   }
 
   bool hasComponent(

Original file line number	Diff line number	Diff line change
`@@ -227,7 +227,12 @@ class TypedComponentSerializer : public ComponentSerializer`
`227`	`227`	`{`
`228`	`228`	`ComponentT component;`
`229`	`229`	`loadComponent(in, component);`
`230`		`- registry.emplace<ComponentT>(entity, std::move(component));`
	`230`	`+ if constexpr (std::is_empty_v<ComponentT>) {`
	`231`	`+ // Tag components in EnTT must be emplaced without constructor args`
	`232`	`+ registry.emplace<ComponentT>(entity);`
	`233`	`+ } else {`
	`234`	`+ registry.emplace<ComponentT>(entity, std::move(component));`
	`235`	`+ }`
`231`	`236`	`}`
`232`	`237`
`233`	`238`	`bool hasComponent(`