src/zobrist.cpp

   1 /* Copyright (C) 2007-2012 Vincent Ollivier
   2  *
   3  * Purple Haze is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 3 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * Purple Haze is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include "zobrist.h"
  18
  19 Zobrist::Zobrist()
  20 {
  21     generator.seed(); // Use Mersenne twister's default seed
  22
  23     side_to_move = gen_hash();
  24     for (int c = 0; c < 2; ++c) {
  25         for (int t = 0; t < 7; ++t) {
  26             for (int s = 0; s < BOARD_SIZE; ++s) {
  27                 pieces_positions[c][t][s] = gen_hash();
  28             }
  29         }
  30     }
  31     for (int i = 0; i < 4; ++i) {
  32         castle_rights[i] = gen_hash();
  33     }
  34     for (int i = 0; i < BOARD_SIZE; ++i) {
  35         en_passants[i] = gen_hash();
  36     }
  37 }
  38
  39 // Generate a random Hash
  40 Hash Zobrist::gen_hash()
  41 {
  42     Hash h = generator();
  43     return h;
  44 }