use new ControlList::add() argument

[ardour.git] / libs / pbd / pbd / command.h

diff --git a/libs/pbd/pbd/command.h b/libs/pbd/pbd/command.h
index a66485bc0da179157104b2fb8e248e254db3d05c..4547b779fb4e736300305017012e6246dfa66ba9 100644 (file)
--- 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 +22,31 @@
 #ifndef __lib_pbd_command_h__
 #define __lib_pbd_command_h__
 
-#include <pbd/statefuldestructible.h>
+#include <string>
+
+#include "pbd/libpbd_visibility.h"
+#include "pbd/signals.h"
+#include "pbd/statefuldestructible.h"
 
-class Command : public PBD::StatefulDestructible
+class LIBPBD_API 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() {}