From 5f350e257214c490639682d0b601be859a3b4332 Mon Sep 17 00:00:00 2001
From: Chris Cranford <chris@hibernate.org>
Date: Fri, 12 Jan 2024 15:25:56 -0500
Subject: Rework GDCLASS macro to allow pure virtual functions

---
 include/godot_cpp/core/class_db.hpp | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

(limited to 'include/godot_cpp/core')

diff --git a/include/godot_cpp/core/class_db.hpp b/include/godot_cpp/core/class_db.hpp
index 4196a76..af394f0 100644
--- a/include/godot_cpp/core/class_db.hpp
+++ b/include/godot_cpp/core/class_db.hpp
@@ -112,6 +112,33 @@ private:
 	template <class T, bool is_abstract>
 	static void _register_class(bool p_virtual = false, bool p_exposed = true);
 
+	template <class T>
+	static GDExtensionObjectPtr _create_instance_func(void *data) {
+		if constexpr (!std::is_abstract_v<T>) {
+			T *new_object = memnew(T);
+			return new_object->_owner;
+		} else {
+			return nullptr;
+		}
+	}
+
+	template <class T>
+	static GDExtensionClassInstancePtr _recreate_instance_func(void *data, GDExtensionObjectPtr obj) {
+		if constexpr (!std::is_abstract_v<T>) {
+#ifdef HOT_RELOAD_ENABLED
+			T *new_instance = (T *)memalloc(sizeof(T));
+			Wrapped::RecreateInstance recreate_data = { new_instance, obj, Wrapped::recreate_instance };
+			Wrapped::recreate_instance = &recreate_data;
+			memnew_placement(new_instance, T);
+			return new_instance;
+#else
+			return nullptr;
+#endif
+		} else {
+			return nullptr;
+		}
+	}
+
 public:
 	template <class T>
 	static void register_class(bool p_virtual = false);
@@ -202,9 +229,9 @@ void ClassDB::_register_class(bool p_virtual, bool p_exposed) {
 		T::to_string_bind, // GDExtensionClassToString to_string_func;
 		nullptr, // GDExtensionClassReference reference_func;
 		nullptr, // GDExtensionClassUnreference unreference_func;
-		T::create, // GDExtensionClassCreateInstance create_instance_func; /* this one is mandatory */
+		&_create_instance_func<T>, // GDExtensionClassCreateInstance create_instance_func; /* this one is mandatory */
 		T::free, // GDExtensionClassFreeInstance free_instance_func; /* this one is mandatory */
-		T::recreate, // GDExtensionClassRecreateInstance recreate_instance_func;
+		&_recreate_instance_func<T>, // GDExtensionClassRecreateInstance recreate_instance_func;
 		&ClassDB::get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
 		nullptr, // GDExtensionClassGetVirtualCallData get_virtual_call_data_func;
 		nullptr, // GDExtensionClassCallVirtualWithData call_virtual_func;
-- 
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