2 Glaurung, a UCI chess playing engine.
3 Copyright (C) 2004-2008 Tord Romstad
5 Glaurung is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 Glaurung is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #if !defined(DIRECTION_H_INCLUDED)
21 #define DIRECTION_H_INCLUDED
36 DIR_E = 0, DIR_N = 1, DIR_NE = 2, DIR_NW = 3, DIR_NONE = 4
39 enum SignedDirection {
40 SIGNED_DIR_E = 0, SIGNED_DIR_W = 1,
41 SIGNED_DIR_N = 2, SIGNED_DIR_S = 3,
42 SIGNED_DIR_NE = 4, SIGNED_DIR_SW = 5,
43 SIGNED_DIR_NW = 6, SIGNED_DIR_SE = 7,
52 extern uint8_t DirectionTable[64][64];
53 extern uint8_t SignedDirectionTable[64][64];
60 inline void operator++ (Direction &d, int) { d = Direction(int(d) + 1); }
62 inline void operator++ (SignedDirection &d, int) {
63 d = SignedDirection(int(d) + 1);
66 inline Direction direction_between_squares(Square s1, Square s2) {
67 return Direction(DirectionTable[s1][s2]);
70 inline SignedDirection signed_direction_between_squares(Square s1, Square s2) {
71 return SignedDirection(SignedDirectionTable[s1][s2]);
79 extern void init_direction_table();
82 #endif // !defined(DIRECTION_H_INCLUDED)