From 350f2f40e928ca3adb454526d0a78de5f4d62c4e Mon Sep 17 00:00:00 2001
From: blueloveTH <blueloveTH@foxmail.com>
Date: Thu, 6 Jul 2023 01:09:49 +0800
Subject: [PATCH] ...

---
 include/pocketpy/cffi.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/pocketpy/cffi.h b/include/pocketpy/cffi.h
index 51938496..ed9895d2 100644
--- a/include/pocketpy/cffi.h
+++ b/include/pocketpy/cffi.h
@@ -82,7 +82,7 @@ struct C99Struct{
     }
 
     template<typename T>
-    C99Struct(std::nullopt_t _, const T& data): C99Struct(sizeof(T)){
+    C99Struct(std::monostate _, const T& data): C99Struct(sizeof(T)){
         static_assert(std::is_pod_v<T>);
         static_assert(!std::is_pointer_v<T>);
         memcpy(p, &data, this->size);
@@ -163,7 +163,7 @@ T to_c99_struct(VM* vm, PyObject* var){
 
 template<typename T>
 std::enable_if_t<std::is_pod_v<T> && !std::is_pointer_v<T>, PyObject*> py_var(VM* vm, const T& data){
-    return VAR_T(C99Struct, std::nullopt, data);
+    return VAR_T(C99Struct, std::monostate(), data);
 }
 /*****************************************************************/
 struct NativeProxyFuncCBase {