read nullopt

source/RobotAPI/libraries/aron/core/data/rw/reader/nlohmannJSON/NlohmannJSONReaderWithoutTypeCheck.cpp

@@ -104,4 +104,17 @@ namespace armarx::aron::data::reader
     {
         i = input;
     }
+    bool
+    NlohmannJSONReaderWithoutTypeCheck::readNull(InputType& input) // defaulted implementation
+    {
+        try
+        {
+            const std::string e = input;
+            return e == "nullopt";
+        }
+        catch (...)
+        {
+            return false;
+        }
+    }
 } // namespace armarx::aron::data::reader

source/RobotAPI/libraries/aron/core/data/rw/reader/nlohmannJSON/NlohmannJSONReaderWithoutTypeCheck.h

@@ -69,5 +69,7 @@ namespace armarx::aron::data::reader
         void readDouble(InputType& input, double& i, Path& p) override;
         void readString(InputType& input, std::string& i, Path& p) override;
         void readBool(InputType& input, bool& i, Path& p) override;
+
+        bool readNull(InputType& input) override;
     };
 } // namespace armarx::aron::data::reader