From 459414f095f44c4e14d416fe068e71bcda4e0091 Mon Sep 17 00:00:00 2001
From: Zain Ruan <zainryan95@gmail.com>
Date: Sun, 3 Jul 2022 16:18:02 -0400
Subject: [PATCH] Fix a performance bug when deserializing C arrays

Without the proposed change, cereal will deserialize the C-array using the slow-path serializeArray(), i.e., the one that deserializes the array element by element, even though the array is arithmetic.
---
 include/cereal/types/common.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/cereal/types/common.hpp b/include/cereal/types/common.hpp
index 4ea67e2e..c761ad46 100644
--- a/include/cereal/types/common.hpp
+++ b/include/cereal/types/common.hpp
@@ -121,7 +121,8 @@ namespace cereal
   CEREAL_SERIALIZE_FUNCTION_NAME(Archive & ar, T & array)
   {
     common_detail::serializeArray( ar, array,
-        std::integral_constant<bool, traits::is_output_serializable<BinaryData<T>, Archive>::value &&
+        std::integral_constant<bool, (traits::is_output_serializable<BinaryData<T>, Archive>::value ||
+                                      traits::is_input_serializable<BinaryData<T>, Archive>::value) &&
                                      std::is_arithmetic<typename std::remove_all_extents<T>::type>::value>() );
   }
 } // namespace cereal