rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 63 insertions, 0 deletions

diff --git a/libs/pbd/pbd/stateful.h b/libs/pbd/pbd/stateful.h
new file mode 100644
index 0000000000..8ea647475a
--- /dev/null
+++ b/libs/pbd/pbd/stateful.h
@@ -0,0 +1,63 @@
+/*
+    Copyright (C) 2000 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __pbd_stateful_h__
+#define __pbd_stateful_h__
+
+#include <string>
+#include <pbd/id.h>
+
+class XMLNode;
+
+namespace PBD {
+
+namespace sys {
+	class path;
+}
+
+class Stateful {
+  public:
+	Stateful();
+	virtual ~Stateful();
+
+	virtual XMLNode& get_state (void) = 0;
+
+	virtual int set_state (const XMLNode&) = 0;
+
+	/* Extra XML nodes */
+
+	void add_extra_xml (XMLNode&);
+	XMLNode *extra_xml (const std::string& str);
+
+	const PBD::ID& id() const { return _id; }
+
+  protected:
+
+	void add_instant_xml (XMLNode&, const sys::path& directory_path);
+	XMLNode *instant_xml (const std::string& str, const sys::path& directory_path);
+
+	XMLNode *_extra_xml;
+	XMLNode *_instant_xml;
+	PBD::ID _id;
+};
+
+} // namespace PBD
+
+#endif /* __pbd_stateful_h__ */
+