source: abuse/trunk/src/imlib/linked.h @ 494 Tweet

/*
 *  Abuse - dark 2D side-scrolling platform game
 *  Copyright (c) 1995 Crack dot Com
 *  Copyright (c) 2005-2011 Sam Hocevar <sam@hocevar.net>
 *
 *  This software was released into the Public Domain. As with most public
 *  domain software, no warranty is made or implied by Crack dot Com or
 *  Jonathan Clark.
 */

// linked.h  - linked list and linked list node classes
// written June 2, 1992 by Jonathan Clark  (at home)
// these classes provide the basic groundwork for any future linked list
// please derive your own linked_node subclass and define the virtual
// function compare.
// example compare function
//   virtual int compare(void *n1, int field)
//        { return ((classname *) n1)->data > data); }
//  should return (1 if n1 is greater than (self)) else return 0
//  field is the value determined by linked_list::set_sort_field
//  this defaults to 1


#ifndef linkman
#define linkman
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define loop(controll,first,inside) { (linked_node *)controll=first; \
  if (first) do { inside (linked_node *) controll=controll->next(); } \
  while ((linked_node *) controll!=first); }

#define loopt(type,controll,first,inside) { controll=(type *)(first); \
  if (first) do { inside controll=(type *)(controll->next()); } \
  while (controll!=(type *)(first)); }


#define loop_rev(controll,last,inside) { (linked_node *)controll=last; \
  if (first) do { inside (linked_node *) controll=controll->last(); } \
  while ((linked_node *) controll!=last); }

#define loopct(type,controll,first,cond,inside) { controll=(type *)first; \
  if (first && (cond)) do { inside controll=(type *)controll->next(); } \
  while (controll!=(type *)first && (cond)); }

#define loop_fort(type,controll,first,x) \
  int x=0; \
  if (first) \
     for (controll=(type *)(first); \
          (!x || (controll)!=(type *)(first)); \
          controll=(type *)(controll->next()),x++)

#define loop_forct(type,controll,first,cond,x) int x=0; if (first) for \
  (controll=(type *)(first); cond && (!x || controll!=(type *)(first)); \
  controll=(type *)(controll->next()),x++)

class linked_node
{
  class linked_node *nextp, *lastp;
public:
  virtual int compare(void *n1, int field)     { return(0); }  // default is = (equal)
  class linked_node *next()              { return nextp; }
  class linked_node *last()              { return lastp; }
  void set_next(class linked_node *p)    { nextp=p; }
  void set_last(class linked_node *p)    { lastp=p; }
  virtual ~linked_node() { ; }
  linked_node() { nextp=NULL; lastp=NULL; }
};

// this is the basic class for all linked_list
// its features should be self-explanatory.
// openly use the functions listed after the keyword PUBLIC
// type conversions may be nessary if you derive a class of nodes of your own
// for example shape is an class derived from linked_node.
// to add a shape to linked lis I have to say
// mylist.add_end( (linked_node *) myshape_pointer);
// unlink removes a node from the list via pointers but does not deallocate
// it from the heap
// the destructor for linked_list will get dispose of all the nodes as
// well, so if you don't want something deleted then you must unlink
// it from the list before the destructor is called

class linked_list
{
  class linked_node *fn, *cn;     // first and current nodes
  int nn; char sortby;
public :
  linked_list(linked_node *first=NULL);
  void add_front(class linked_node *p);
  void add_end(class linked_node *p);
  void insert(class linked_node *p);
  void set_sort_field(int x) { sortby=x; }   // this is passed to compare
  class linked_node *current() { return cn; }
  class linked_node *first() { return fn; }
  class linked_node *last() { return fn->last(); }
  class linked_node *get_node(int x);
  void set_current(class linked_node *p) { cn=p; }
  void go_first() { cn=fn; }
  void go_end() { cn=fn->last(); }
  void go_next() { cn=cn->next(); }
  void go_last() { cn=cn->last(); }
  int number_nodes()  { return nn; }
  int node_number(linked_node *p);
  int unlink(linked_node *p);
  ~linked_list();
};

#endif