Forward declaration of another class

diff --git a/include/simgrid/forward.h b/include/simgrid/forward.h
index 2c1da4f..d4486a2 100644 (file)
--- a/include/simgrid/forward.h
+++ b/include/simgrid/forward.h
@@ -123,6 +123,7 @@ using ActorCodeFactory = std::function<ActorCode(std::vector<std::string> args)>
 
 class Simcall;
 class SimcallObserver;
+class MutexObserver;
 class ObjectAccessSimcallObserver;
 class ObjectAccessSimcallItem;
 } // namespace actor