new file

git-svn-id: svn://localhost/ardour2/trunk@831 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/pbd/pbd/destructible.h

@@ -0,0 +1,20 @@
+#ifndef __pbd_destructible_h__
+#define __pbd_destructible_h__
+
+#include <sigc++/signal.h>
+
+namespace PBD {
+
+class Destructible {
+  public:
+	Destructible() {}
+	virtual ~Destructible () {}
+
+	sigc::signal<void> GoingAway;
+
+	void drop_references () const { GoingAway(); }
+};
+
+}
+
+#endif /* __pbd_destructible_h__ */