From 44b1835633d720607dd37aed513f460c8e46e92e Mon Sep 17 00:00:00 2001
From: Martijn Otto <martijn@resolume.com>
Date: Wed, 17 Jan 2024 10:52:33 +0100
Subject: [PATCH] Allow null for `std::optional`

---
 dev/json_dto/pub.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dev/json_dto/pub.hpp b/dev/json_dto/pub.hpp
index c404ffb..37a5d66 100644
--- a/dev/json_dto/pub.hpp
+++ b/dev/json_dto/pub.hpp
@@ -1604,6 +1604,15 @@ default_on_null( nullable_t< Field_Type > & f )
 	f.reset();
 }
 
+#if defined( JSON_DTO_SUPPORTS_STD_OPTIONAL )
+template< typename FieldType >
+void
+default_on_null( std::optional< FieldType > & f )
+{
+    f.reset();
+}
+#endif
+
 template< typename Field_Type, typename Field_Default_Value_Type >
 void
 set_default_value( Field_Type & f, Field_Default_Value_Type && default_value )