propery deprecate the old style

include/realtime_tools/realtime_helpers.hpp

@@ -55,6 +55,19 @@ bool has_realtime_kernel();
  */
 bool configure_sched_fifo(int priority);
 
+/**
+ * Locks the memory pages of the calling thread to prevent page faults.
+ * By calling this method, the programs locks all pages mapped into the address
+ * space of the calling process and future mappings. This means that the kernel
+ * will not swap out the pages to disk i.e., the pages are guaranteed to stay in
+ * RAM until later unlocked - which is important for realtime applications.
+ * \param[out] message a message describing the result of the operation
+ * \returns  a pair of a boolean indicating whether the operation succeeded or not.
+*/
+
+[[deprecated("Use std::pair<bool, std::string> lock_memory() instead.")]]
+bool lock_memory(std::string & message);
+
 /**
  * Locks the memory pages of the calling thread to prevent page faults.
  * By calling this method, the programs locks all pages mapped into the address

src/realtime_helpers.cpp

@@ -64,6 +64,13 @@ bool configure_sched_fifo(int priority)
 #endif
 }
 
+bool lock_memory(std::string & message)
+{
+  const auto lock_result = lock_memory();
+  message = lock_result.second;
+  return lock_result.first;
+}
+
 std::pair<bool, std::string> lock_memory()
 {
 #ifdef _WIN32