Rename a variable.

[dcpomatic.git] / src / lib / event_history.h

diff --git a/src/lib/event_history.h b/src/lib/event_history.h
index e194f633335f0c3e0850a4db3c101d54aadabfef..4670e7bfe8069b215448d09c62f545af909c7d1c 100644 (file)
--- a/src/lib/event_history.h
+++ b/src/lib/event_history.h
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2017 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2017-2019 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -22,6 +22,7 @@
 #define DCPOMATIC_EVENT_HISTORY_H
 
 #include <boost/thread/mutex.hpp>
+#include <boost/optional.hpp>
 #include <list>
 
 class EventHistory
@@ -29,7 +30,7 @@ class EventHistory
 public:
        explicit EventHistory (int size);
 
-       float rate () const;
+       boost::optional<float> rate () const;
        void event ();
 
 private: