refactor: using references where possible

components/spit/include/SPIT_Message.h

@@ -156,6 +156,8 @@ class SPIT_Message {
         return m_OPPart->getHeader()->getOPFlag();
     }
     const OPPart *getOPPart() const { return m_OPPart.get(); }
+    template<typename T>
+    T &getOPPartAs() const { return *reinterpret_cast<T *>(m_OPPart.get()); }
 
   private:
     bool parse(std::vector<char> message);