Fix "invalid application of 'sizeof' to an incomplete type" (#148854)

cyyever · pytorchmergebot · commit 295f2ed4d103 · 2025-03-11T00:40:00.000Z
Fixes with C++23 and constexpr std::unique_ptr Pull Request resolved: #148854 Approved by: https://github.com/Skylion007
diff --git a/torch/_export/serde/schema_check.py b/torch/_export/serde/schema_check.py
@@ -446,9 +446,9 @@ class ForwardRef {{
 
  public:
   ForwardRef(): ptr_(std::make_unique<T>()) {{}}
-  ForwardRef(ForwardRef<T>&&) = default;
+  ForwardRef(ForwardRef<T>&&);
   ForwardRef(const ForwardRef<T>& other): ptr_(std::make_unique<T>(*other.ptr_)) {{}}
-  ForwardRef<T>& operator=(ForwardRef<T>&&) = default;
+  ForwardRef<T>& operator=(ForwardRef<T>&&);
   ForwardRef<T>& operator=(const ForwardRef<T>& other) {{
     ptr_ = std::make_unique<T>(*other.ptr_);
     return *this;
@@ -521,6 +521,9 @@ class F64 {{
 {"".join(cpp_enum_defs.values())}
 {"".join(dict(sorted(cpp_class_defs.items(), key=lambda x: class_ordering[x[0]])).values())}
 {chr(10).join(cpp_json_defs)}
+
+template <typename T> ForwardRef<T>::ForwardRef(ForwardRef<T>&&) = default;
+template <typename T> ForwardRef<T>& ForwardRef<T>::operator=(ForwardRef<T>&&) = default;
 }} // namespace _export
 }} // namespace torch
 """
