Merge pull request #3128 from SergioRAgostinho/function-grabber

Add registerCallback overload to pcl grabber to support assignment of  boost functions with templated signatures

io/include/pcl/io/grabber.h

@@ -68,9 +68,21 @@ namespace pcl
         * \param[in] callback: the callback function/method
         * \return Connection object, that can be used to disconnect the callback method from the signal again.
         */
-      template<typename T> boost::signals2::connection 
+      template<typename T> boost::signals2::connection
       registerCallback (const std::function<T>& callback);
 
+      /** \brief registers a callback function/method to a signal with the corresponding signature
+        * \param[in] callback: the callback function/method
+        * \return Connection object, that can be used to disconnect the callback method from the signal again.
+        */
+      template<typename T, template<typename> class FunctionT>
+      [[deprecated ("please assign the callback to a std::function.")]]
+      boost::signals2::connection
+      registerCallback (const FunctionT<T>& callback)
+      {
+        return registerCallback (std::function<T> (callback));
+      }
+
       /** \brief indicates whether a signal with given parameter-type exists or not
         * \return true if signal exists, false otherwise
         */