From 72168803ee845adef9743fd24421b9719a0901b0 Mon Sep 17 00:00:00 2001
From: Hans Fugal <hans@fugal.net>
Date: Tue, 18 Jul 2006 17:46:20 +0000
Subject: [PATCH]  r183@gandalf:  fugalh | 2006-07-17 19:01:39 -0600  Use
 XMLNode instead of templating memento types.

git-svn-id: svn://localhost/ardour2/branches/undo@683 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/pbd3/pbd/memento_command.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/libs/pbd3/pbd/memento_command.h b/libs/pbd3/pbd/memento_command.h
index adeb61659a..c9952c443c 100644
--- a/libs/pbd3/pbd/memento_command.h
+++ b/libs/pbd3/pbd/memento_command.h
@@ -24,13 +24,17 @@
 #include <pbd/command.h>
 #include <sigc++/slot.h>
 
-template <class obj_T, class mem_T>
+/** This command class is initialized with before and after mementos 
+ * (from Stateful::get_state()), so undo becomes restoring the before
+ * memento, and redo is restoring the after memento.
+ */
+template <class obj_T>
 class MementoCommand : public Command
 {
     public:
         MementoCommand(obj_T &obj, 
-                       mem_T before,
-                       mem_T after
+                       XMLNode &before,
+                       XMLNode &after
                        ) 
             : obj(obj), before(before), after(after) {}
         void operator() () { obj.set_memento(after); }
@@ -41,9 +45,10 @@ class MementoCommand : public Command
             // key is "MementoCommand" or something
             // before and after mementos
         }
+        // TODO does this need a copy constructor?
     protected:
         obj_T &obj;
-        mem_T before, after;
+        XMLNode &before, &after;
 };
 
 #endif // __lib_pbd_memento_h__