/*

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 */

// utl_list.cc
//
// Implementation of generic single-linked lists

// 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.
//
//	 For portability reasons we have decided to provide both this and
//	 an implementation of the list classes in terms of templates. If
//	 your compiler supports templates, please use the files in the
//	 include/utl_tmpl and util/utl_tmpl directories instead of the
//	 files by the same names in the include and util directories.

#include	"idl.h"
#include	"idl_extern.h"

/*
 * Constructor(s)
 */

UTL_List::UTL_List(UTL_List *c)
	: pd_cdr_data(c) 
{
}

/*
 * Private operations
 */

// Compute list length
long
UTL_List::list_length(long n)
{
  if (pd_cdr_data == NULL)
    return n;
  else
    return pd_cdr_data->list_length(n+1);
}

/*
 * Public operations
 */

// Smash last cdr with l
void
UTL_List::nconc(UTL_List *l)
{
  if (pd_cdr_data == NULL)
    pd_cdr_data = l;
  else
    pd_cdr_data->nconc(l);
}

/*
 * Override this operation to copy lists of other types
 */
// Copy a list
UTL_List *
UTL_List::copy()
{
  if (pd_cdr_data == NULL)
    return new UTL_List(NULL);
  return new UTL_List(pd_cdr_data->copy());
}

// Get next list
UTL_List *
UTL_List::tail()
{
  return pd_cdr_data;
}

// Set next list
void
UTL_List::set_tail(UTL_List *l)
{
  pd_cdr_data = l;
}

// Compute list length
long
UTL_List::length()
{
  return list_length(1);
}

/*
 * Redefinition of inherited virtual operations
 */

// UTL_List active iterator

/*
 * Constructor
 */

UTL_ListActiveIterator::UTL_ListActiveIterator(UTL_List *s)
		      : source(s)
{
}

/*
 * Private operations
 */

/*
 * Public operations
 */

// Is iterator done?
long
UTL_ListActiveIterator::is_done()
{
  return (source == NULL) ? I_TRUE : I_FALSE;
}

// Advance to next item
void
UTL_ListActiveIterator::next()
{
  if (source != NULL)
    source = source->tail();
}

/*
 * Redefinition of inherited operations
 */