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+// $Id$
+
+/*
+
+COPYRIGHT
+
+Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
+States of America.  All Rights Reserved.
+
+This product is protected by copyright and distributed under the following
+license restricting its use.
+
+The Interface Definition Language Compiler Front End (CFE) is made
+available for your use provided that you include this license and copyright
+notice on all media and documentation and the software program in which
+this product is incorporated in whole or part. You may copy and extend
+functionality (but may not remove functionality) of the Interface
+Definition Language CFE without charge, but you are not authorized to
+license or distribute it to anyone else except as part of a product or
+program developed by you or with the express written consent of Sun
+Microsystems, Inc. ("Sun").
+
+The names of Sun Microsystems, Inc. and any of its subsidiaries or
+affiliates may not be used in advertising or publicity pertaining to
+distribution of Interface Definition Language CFE as permitted herein.
+
+This license is effective until terminated by Sun for failure to comply
+with this license.  Upon termination, you shall destroy or return all code
+and documentation for the Interface Definition Language CFE.
+
+INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED AS IS WITH NO WARRANTIES OF
+ANY KIND INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS
+FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR ARISING FROM A COURSE OF
+DEALING, USAGE OR TRADE PRACTICE.
+
+INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED WITH NO SUPPORT AND WITHOUT
+ANY OBLIGATION ON THE PART OF Sun OR ANY OF ITS SUBSIDIARIES OR AFFILIATES
+TO ASSIST IN ITS USE, CORRECTION, MODIFICATION OR ENHANCEMENT.
+
+SUN OR ANY OF ITS SUBSIDIARIES OR AFFILIATES SHALL HAVE NO LIABILITY WITH
+RESPECT TO THE INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY
+INTERFACE DEFINITION LANGUAGE CFE OR ANY PART THEREOF.
+
+IN NO EVENT WILL SUN OR ANY OF ITS SUBSIDIARIES OR AFFILIATES BE LIABLE FOR
+ANY LOST REVENUE OR PROFITS OR OTHER SPECIAL, INDIRECT AND CONSEQUENTIAL
+DAMAGES, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+Use, duplication, or disclosure by the government is subject to
+restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
+Technical Data and Computer Software clause at DFARS 252.227-7013 and FAR
+52.227-19.
+
+Sun, Sun Microsystems and the Sun logo are trademarks or registered
+trademarks of Sun Microsystems, Inc.
+
+SunSoft, Inc.
+2550 Garcia Avenue
+Mountain View, California  94043
+
+NOTE:
+
+SunOS, SunSoft, Sun, Solaris, Sun Microsystems or the Sun logo are
+trademarks or registered trademarks of Sun Microsystems, Inc.
+
+ */
+
+#ifndef _UTL_LIST_UTL_LIST_HH
+#define _UTL_LIST_UTL_LIST_HH
+
+// General single-linked list.
+
+// NOTE: This list class only works correctly because we use single public
+//       inheritance, as opposed to multiple inheritance or public virtual.
+//       It relies on a type-unsafe cast from UTL_List to subclasses, which
+//       will cease to operate correctly if you use either multiple or
+//       public virtual inheritance.
+
+#include "TAO_IDL_FE_Export.h"
+
+
+// Forward declare active iterator for UTL_List.
+class  UTL_ListActiveIterator;
+
+class TAO_IDL_FE_Export UTL_List
+{
+public:
+  UTL_List (UTL_List *c);
+
+  virtual ~UTL_List (void);
+
+  // Smash last cdr pointer in "this" with l.
+  void nconc (UTL_List *l);
+
+  // Copy the list starting at "this".
+  virtual UTL_List *copy (void);
+
+  // Get next list.
+  UTL_List *tail (void);
+
+  // Set next list
+  void set_tail (UTL_List *l);
+
+  // How long is this list?
+  long length (void);
+
+  // Cleanup.
+  virtual void destroy (void);
+
+private:
+  // The next list.
+  UTL_List *pd_cdr_data;
+
+  // Operations
+  long list_length (long n);
+
+  // Friend class.
+  friend class UTL_ListActiveIterator;
+  friend class UTL_ExceptList;
+};
+
+// Active iterator for lists.
+class TAO_IDL_FE_Export UTL_ListActiveIterator
+{
+public:
+
+  UTL_ListActiveIterator (UTL_List *s);
+
+  virtual ~UTL_ListActiveIterator (void) {}
+
+  // Get next list.
+  virtual void next (void);
+
+  // Are we at the end of this list?
+  virtual bool is_done (void);
+
+protected:
+  // On what to iterate?
+  UTL_List *source;
+};
+
+#endif           // _UTL_LIST_UTL_LIST_HH