[struct_pack] fix stack overflow in serialize when there is many struct member

Author: poor-circle

include/ylt/struct_pack/packer.hpp

@@ -139,13 +139,9 @@ class packer {
   }
 
   template <std::size_t size_type, uint64_t version,
-            std::uint64_t parent_tag = 0, typename First, typename... Args>
-  constexpr void STRUCT_PACK_INLINE serialize_many(const First &first_item,
-                                                   const Args &...items) {
-    serialize_one<size_type, version, parent_tag>(first_item);
-    if constexpr (sizeof...(items) > 0) {
-      serialize_many<size_type, version, parent_tag>(items...);
-    }
+            std::uint64_t parent_tag = 0, typename... Args>
+  constexpr void STRUCT_PACK_INLINE serialize_many(const Args &...items) {
+    (serialize_one<size_type, version, parent_tag>(items), ...);
   }
   constexpr void STRUCT_PACK_INLINE write_padding(std::size_t sz) {
     if (sz > 0) {