1 files changed, 9 insertions, 0 deletions
diff --git a/src/openvic-simulation/dataloader/NodeTools.hpp b/src/openvic-simulation/dataloader/NodeTools.hpp
index 4d56488..a23fb4f 100644
--- a/src/openvic-simulation/dataloader/NodeTools.hpp
+++ b/src/openvic-simulation/dataloader/NodeTools.hpp
@@ -4,6 +4,7 @@
 #include <cstdint>
 #include <functional>
 #include <map>
+#include <optional>
 #include <set>
 #include <type_traits>
 
@@ -310,5 +311,13 @@ namespace OpenVic {
 				return true;
 			};
 		}
+
+		template<typename T>
+		Callback<T const&> auto assign_variable_callback_pointer(std::optional<T const*>& var) {
+			return [&var](T const& val) -> bool {
+				var = &val;
+				return true;
+			};
+		}
 	}
 }