fixes for endemic (compiler?) issues with virtual inheritance of sigc::trackable. NOTE: automation list undo/redo no longer operational, fix to follow

git-svn-id: svn://localhost/ardour2/trunk@1007 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 12 insertions, 4 deletions

diff --git a/libs/pbd/pbd/destructible.h b/libs/pbd/pbd/destructible.h
index 6692ff564c..7c50806334 100644
--- a/libs/pbd/pbd/destructible.h
+++ b/libs/pbd/pbd/destructible.h
@@ -5,14 +5,22 @@
 
 namespace PBD {
 
-class Destructible : public virtual sigc::trackable {
-  public:
-	Destructible() {}
-	virtual ~Destructible () {}
+/* be very very careful using this class. it does not inherit from sigc::trackable and thus
+   should only be used in multiple-inheritance situations involving another type
+   that does inherit from sigc::trackable (or sigc::trackable itself)
+*/
 
+class ThingWithGoingAway {
+  public:
+	virtual ~ThingWithGoingAway () {}
 	sigc::signal<void> GoingAway;
+};
 
+class Destructible : public sigc::trackable, public ThingWithGoingAway {
+  public:
+	virtual ~Destructible () {}
 	void drop_references () const { GoingAway(); }
+
 };
 
 }