hunyadi-dev commented on a change in pull request #911:
URL: https://github.com/apache/nifi-minifi-cpp/pull/911#discussion_r542227113
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File path: libminifi/include/core/FlowFile.h
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@@ -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:
One needs to call `.value().get()` or `->get()` on an optional of
reference handlers. It indeed would be an issue if someone seriously misused
`auto` for holding the return value, but otherwise this is even safer than
returning a const ref.
https://godbolt.org/z/jbhf3n
Will change this to **return a copy** :cry:
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