2 files changed, 5 insertions, 1 deletions
diff --git a/include/proj/common.hpp b/include/proj/common.hpp
index 0a1f5d19..d2f71989 100644
--- a/include/proj/common.hpp
+++ b/include/proj/common.hpp
@@ -253,10 +253,10 @@ class DateTime {
   protected:
     DateTime();
     PROJ_FRIEND_OPTIONAL(DateTime);
+    DateTime &operator=(const DateTime &other);
 
   private:
     explicit DateTime(const std::string &str);
-    DateTime &operator=(const DateTime &other) = delete;
 
     PROJ_OPAQUE_PRIVATE_DATA
 };
diff --git a/include/proj/datum.hpp b/include/proj/datum.hpp
index a26c94b9..e97f1695 100644
--- a/include/proj/datum.hpp
+++ b/include/proj/datum.hpp
@@ -89,6 +89,10 @@ class PROJ_GCC_DLL Datum : public common::ObjectUsage,
   protected:
     PROJ_INTERNAL void setAnchor(const util::optional<std::string> &anchor);
 
+    PROJ_INTERNAL void
+    setProperties(const util::PropertyMap
+                      &properties); // throw(InvalidValueTypeException)
+
   private:
     PROJ_OPAQUE_PRIVATE_DATA
     Datum &operator=(const Datum &other) = delete;