1 files changed, 51 insertions, 0 deletions
diff --git a/libs/pbd/pbd/shiva.h b/libs/pbd/pbd/shiva.h
new file mode 100644
index 0000000000..5110f48332
--- /dev/null
+++ b/libs/pbd/pbd/shiva.h
@@ -0,0 +1,51 @@
+#ifndef __pbd_shiva_h__
+#define __pbd_shiva_h__
+
+#include <sigc++/sigc++.h>
+
+namespace PBD {
+
+template<typename ObjectWithGoingAway, typename ObjectToBeDestroyed>
+
+/* named after the Hindu god Shiva, The Destroyer */
+
+class Shiva {
+  public:
+	Shiva (ObjectWithGoingAway& emitter, ObjectToBeDestroyed& receiver) {
+
+		/* if the emitter goes away, destroy the receiver */
+
+		_connection1 = emitter.GoingAway.connect 
+			(sigc::bind (sigc::mem_fun 
+				     (*this, &Shiva<ObjectWithGoingAway,ObjectToBeDestroyed>::destroy),
+				     &receiver));
+
+		/* if the receiver goes away, forget all this nonsense */
+
+		_connection2 = receiver.GoingAway.connect 
+			(sigc::mem_fun (*this, &Shiva<ObjectWithGoingAway,ObjectToBeDestroyed>::forget));
+	}
+
+	~Shiva() { 
+		forget ();
+	}
+
+  private:
+	sigc::connection _connection1;
+	sigc::connection _connection2;
+
+	void destroy (ObjectToBeDestroyed* obj) {
+		delete obj;
+		forget ();
+	}
+
+	void forget () {
+		_connection1.disconnect ();
+		_connection2.disconnect ();
+	}
+			
+};
+
+}
+
+#endif /* __pbd_shiva_h__ */