X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fpbd%2Fcommand.h;h=db4d2bbd814774d0910b1f59786c25a6d21f43c2;hb=99bf5d9eeda1e5e1811d660c0c22bb5a2d4984c0;hp=a66485bc0da179157104b2fb8e248e254db3d05c;hpb=d7db3f757fde92126ef9886370ce604992b7e974;p=ardour.git

diff --git a/libs/pbd/pbd/command.h b/libs/pbd/pbd/command.h
index a66485bc0d..db4d2bbd81 100644
--- a/libs/pbd/pbd/command.h
+++ b/libs/pbd/pbd/command.h
@@ -1,3 +1,4 @@
+
 /* 
     Copyright (C) 2006 Paul Davis
     Author: Hans Fugal
@@ -21,23 +22,30 @@
 #ifndef __lib_pbd_command_h__
 #define __lib_pbd_command_h__
 
-#include <pbd/statefuldestructible.h>
+#include <string>
+
+#include "pbd/signals.h"
+#include "pbd/statefuldestructible.h"
 
-class Command : public PBD::StatefulDestructible
+class Command : public PBD::StatefulDestructible, public PBD::ScopedConnectionList
 {
 public:
-	virtual ~Command() {}
+	virtual ~Command() { /* NOTE: derived classes must call drop_references() */ }
 
 	virtual void operator() () = 0;
 	
 	void set_name (const std::string& str) { _name = str; }
 	const std::string& name() const { return _name; }
-	
+
 	virtual void undo() = 0;
 	virtual void redo() { (*this)(); }
 	
 	virtual XMLNode &get_state();
-	virtual int set_state(const XMLNode&) { /* noop */ return 0; }
+	virtual int set_state(const XMLNode&, int /*version*/) { /* noop */ return 0; }
+
+	virtual bool empty () const {
+		return false;
+	}
 
 protected:
 	Command() {}