//
//  Copyright (C) 1999 by
//  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
// DESCRIPTION:
//  MapObj data. Map Objects or mobjs are actors, entities,
//  thinker, take-your-pick... anything that moves, acts, or
//  suffers state changes of more or less violent nature.
//
//-----------------------------------------------------------------------------

#ifndef __D_THINK__
#define __D_THINK__

#include "p_action.h"

struct player_s;
struct pspdef_s;
struct mobj_s;

typedef void (*actionf_v)(void);
typedef void (*actionf_p1)(struct mobj_s *);
typedef void (*actionf_p2)(struct player_s *, struct pspdef_s *);

typedef union actionf_u
{
  actionf_v v;
  actionf_p1 p1;
  actionf_p2 p2;
} actionf_t;

// Historically, "think_t" is yet another function 
// pointer to a routine to handle an actor.
typedef actionf_t think_t;

// Doubly linked list of actors.
typedef struct thinker_s
{
  struct thinker_s *prev, *next;
  think_t function;
  
  // killough 8/29/98: we maintain thinkers in several equivalence classes,
  // according to various criteria, so as to allow quicker searches.

  struct thinker_s *cnext, *cprev; // Next, previous thinkers in same class

  // killough 11/98: count of how many other objects reference
  // this one using pointers. Used for garbage collection.
  unsigned references;
} thinker_t;

#endif

//----------------------------------------------------------------------------
//
// $Log: d_think.h,v $
// Revision 1.3  1998/05/04  21:34:20  thldrmn
// commenting and reformatting
//
// Revision 1.2  1998/01/26  19:26:34  phares
// First rev with no ^Ms
//
// Revision 1.1.1.1  1998/01/19  14:03:08  rand
// Lee's Jan 19 sources
//
//
//----------------------------------------------------------------------------
