hunyadi-dev commented on a change in pull request #911:
URL: https://github.com/apache/nifi-minifi-cpp/pull/911#discussion_r542421625



##########
File path: libminifi/include/core/FlowFile.h
##########
@@ -129,7 +130,9 @@ class FlowFile : public core::Connectable, public 
ReferenceContainer {
    * @param value value to set
    * @return result of finding key
    */
-  bool getAttribute(std::string key, std::string& value) const;
+  bool getAttribute(const std::string& key, std::string& value) const;
+
+  utils::optional<std::reference_wrapper<const std::string>> 
getAttribute(const std::string& key) const;

Review comment:
       I am not arguing for safety, to plut it blunt I just do not like 
unnecessary copies.




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