Also use TrackChains as target locations in Timetable

[r2c2.git] / source / libr2c2 / trackchain.h

diff --git a/source/libr2c2/trackchain.h b/source/libr2c2/trackchain.h
index 729a89cd9c6910882fe641721f86751e93df21e0..e2d6176f2c1733ff093975d39ef5afe132bbebc4 100644 (file)
--- a/source/libr2c2/trackchain.h
+++ b/source/libr2c2/trackchain.h
@@ -4,6 +4,7 @@
 #include <set>
 #include <stdexcept>
 #include <sigc++/trackable.h>
+#include <msp/datafile/statement.h>
 #include "trackiter.h"
 
 namespace R2C2 {
@@ -65,6 +66,9 @@ public:
 
 private:
        void object_removed(Object &);
+
+public:
+       virtual Msp::DataFile::Statement save_reference() const = 0;
 };
 
 } // namespace R2C2