move.h

   1 /***************************************************************************
   2                           move.h  -  Move related definitions
   3                              -------------------
   4     begin                : Sun Nov 28 2007
   5     copyright            : (C) 2007 by Maurizio Monge
   6     email                : monge@linuz.sns.it
   7  ***************************************************************************/
   8
   9 /***************************************************************************
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  ***************************************************************************/
  17
  18 #ifndef __MOVE_H__
  19 #define __MOVE_H__
  20
  21 #include "utils.h"
  22
  23 // store all the possible moves of a knight.
  24 class PACKED KnightMove
  25 {
  26 public:
  27     uint8_t jump[8];
  28     uint8_t numm;
  29 };
  30
  31
  32 /* PACKED, use a small structure even if unaligned.
  33    if i can quote Alan Cox, "Cache is king" :) */
  34 class PACKED Move
  35 {
  36 public:
  37     union
  38     {
  39         struct
  40         {
  41             uint8_t from;    /* square we are moving from */
  42             uint8_t to;      /* square we are moving to */
  43             uint8_t capture;
  44             uint8_t flags;
  45         };
  46         uint32_t as_int;
  47     };
  48     int16_t val;
  49     uint8_t cost;
  50     uint8_t extend;
  51
  52     int operator==(const Move& m){
  53         return (as_int == m.as_int);  }
  54     int operator!=(const Move& m) {
  55         return (as_int != m.as_int);  }
  56
  57     static Move FromInt(int i)
  58     {
  59         Move m;
  60         m.as_int = i;
  61         return m;
  62     }
  63     static Move HT()
  64     {
  65         Move m;
  66         m.as_int = 0xfffffffe;
  67         return m;
  68     }
  69     static Move None()
  70     {
  71         Move m;
  72         m.as_int = 0xffffffff;
  73         return m;
  74     }
  75 };
  76
  77 #endif //__MOVE_H__