+#ifndef STLPLUS_PERSISTENT_INTERFACE\r
+#define STLPLUS_PERSISTENT_INTERFACE\r
+////////////////////////////////////////////////////////////////////////////////\r
+\r
+// Author: Andy Rushton\r
+// Copyright: (c) Southampton University 1999-2004\r
+// (c) Andy Rushton 2004-2009\r
+// License: BSD License, see ../docs/license.html\r
+\r
+// Persistence for pointers to polymorphic classes using the interface approach.\r
+\r
+// This works on a set of classes derived from a common superclass called\r
+// persistent which is declared as an interface. Each subclass has a set of\r
+// methods that enable clone/dump/restore operations. Each subclass must be\r
+// registered with the persistence dump/restore context so that the system\r
+// knows how to dump it.\r
+\r
+// This approach is suited to classes that can be modified to add persistence\r
+// methods. See persistent_callback for a non-invasive way of handling\r
+// polymorphism.\r
+\r
+// Objects are always dumped/restored as pointers to the superclass T.\r
+\r
+// Multiple pointers to the same object are handled in the same way as for\r
+// simple pointers\r
+\r
+// Only classes registered with the context can be dumped and restored as\r
+// polymorphic types - see dump_context::register_interface and\r
+// restore_context::register_interface. Attempting to use any unrecognised class\r
+// will throw an exception.\r
+\r
+////////////////////////////////////////////////////////////////////////////////\r
+#include "persistence_fixes.hpp"\r
+#include "persistent_contexts.hpp"\r
+#include "persistent.hpp"\r
+\r
+////////////////////////////////////////////////////////////////////////////////\r
+\r
+namespace stlplus\r
+{\r
+\r
+ template<typename T>\r
+ void dump_interface(dump_context&, const T* const data)\r
+ throw(persistent_dump_failed);\r
+\r
+ template<typename T>\r
+ void restore_interface(restore_context&, T*& data)\r
+ throw(persistent_restore_failed);\r
+\r
+} // end namespace stlplus\r
+\r
+ ////////////////////////////////////////////////////////////////////////////////\r
+#include "persistent_interface.tpp"\r
+#endif\r