// utl_list.h,v 1.7 2002/07/01 13:49:22 parsons Exp

/*

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 */

#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"
#include "idl_bool.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;
};

// Active iterator for lists.
class TAO_IDL_FE_Export UTL_ListActiveIterator
{
public:
  UTL_ListActiveIterator (UTL_List *s);

  // Get next list.
  virtual void next (void);

  // Are we at the end of this list?
  virtual idl_bool is_done (void);

protected:
  // On what to iterate?
  UTL_List *source;
};

#endif           // _UTL_LIST_UTL_LIST_HH
