X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fevent_history.h;h=a98447f4246f58aa37d11514a59406e59a3af326;hb=0e896f9f37db001f34c876ed5fc50e874f96ae09;hp=e194f633335f0c3e0850a4db3c101d54aadabfef;hpb=a69d242f3f00207d6ea7320e6723775f4b0dbfb3;p=dcpomatic.git

diff --git a/src/lib/event_history.h b/src/lib/event_history.h
index e194f6333..a98447f42 100644
--- 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) 2017-2021 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -18,18 +18,22 @@
 
 */
 
+
 #ifndef DCPOMATIC_EVENT_HISTORY_H
 #define DCPOMATIC_EVENT_HISTORY_H
 
+
 #include <boost/thread/mutex.hpp>
+#include <boost/optional.hpp>
 #include <list>
 
+
 class EventHistory
 {
 public:
 	explicit EventHistory (int size);
 
-	float rate () const;
+	boost::optional<float> rate () const;
 	void event ();
 
 private:
@@ -43,4 +47,5 @@ private:
 	int const _size;
 };
 
+
 #endif