add ::use_count() method to InvalidationRecord

diff --git a/libs/pbd/pbd/event_loop.h b/libs/pbd/pbd/event_loop.h
index 09265c13d85b3ded97cf4e9658d35183e250b255..2b661a7e3571155d583a5f9317b51425b4f7ef42 100644 (file)
--- a/libs/pbd/pbd/event_loop.h
+++ b/libs/pbd/pbd/event_loop.h
@@ -70,6 +70,7 @@ public:
                void ref ()    { g_atomic_int_inc (&_ref); }
                void unref ()  { g_atomic_int_dec_and_test (&_ref); }
                bool in_use () { return g_atomic_int_get (&_ref) > 0; }
+               int  use_count () { return g_atomic_int_get (&_ref); }
        };
 
        static void* invalidate_request (void* data);