2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #if !defined(SQUARE_H_INCLUDED)
21 #define SQUARE_H_INCLUDED
23 #include <cstdlib> // for abs()
30 SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
31 SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,
32 SQ_A3, SQ_B3, SQ_C3, SQ_D3, SQ_E3, SQ_F3, SQ_G3, SQ_H3,
33 SQ_A4, SQ_B4, SQ_C4, SQ_D4, SQ_E4, SQ_F4, SQ_G4, SQ_H4,
34 SQ_A5, SQ_B5, SQ_C5, SQ_D5, SQ_E5, SQ_F5, SQ_G5, SQ_H5,
35 SQ_A6, SQ_B6, SQ_C6, SQ_D6, SQ_E6, SQ_F6, SQ_G6, SQ_H6,
36 SQ_A7, SQ_B7, SQ_C7, SQ_D7, SQ_E7, SQ_F7, SQ_G7, SQ_H7,
37 SQ_A8, SQ_B8, SQ_C8, SQ_D8, SQ_E8, SQ_F8, SQ_G8, SQ_H8,
45 DELTA_NN = DELTA_N + DELTA_N,
46 DELTA_NE = DELTA_N + DELTA_E,
47 DELTA_SE = DELTA_S + DELTA_E,
48 DELTA_SS = DELTA_S + DELTA_S,
49 DELTA_SW = DELTA_S + DELTA_W,
50 DELTA_NW = DELTA_N + DELTA_W
54 FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H
58 RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8
61 ENABLE_OPERATORS_ON(Square)
62 ENABLE_OPERATORS_ON(File)
63 ENABLE_OPERATORS_ON(Rank)
65 const int FlipMask = 56;
66 const int FlopMask = 7;
68 inline Square make_square(File f, Rank r) {
69 return Square((int(r) << 3) | int(f));
72 inline File square_file(Square s) {
73 return File(int(s) & 7);
76 inline Rank square_rank(Square s) {
77 return Rank(int(s) >> 3);
80 inline Square flip_square(Square s) {
81 return Square(int(s) ^ FlipMask);
84 inline Square flop_square(Square s) {
85 return Square(int(s) ^ FlopMask);
88 inline Square relative_square(Color c, Square s) {
89 return Square(int(s) ^ (int(c) * FlipMask));
92 inline Rank relative_rank(Color c, Rank r) {
93 return Rank(int(r) ^ (int(c) * 7));
96 inline Rank relative_rank(Color c, Square s) {
97 return relative_rank(c, square_rank(s));
100 inline SquareColor square_color(Square s) {
101 return SquareColor(int(square_rank(s) + s) & 1);
104 inline bool opposite_color_squares(Square s1, Square s2) {
105 int s = int(s1) ^ int(s2);
106 return ((s >> 3) ^ s) & 1;
109 inline int file_distance(Square s1, Square s2) {
110 return abs(square_file(s1) - square_file(s2));
113 inline int rank_distance(Square s1, Square s2) {
114 return abs(square_rank(s1) - square_rank(s2));
117 inline int square_distance(Square s1, Square s2) {
118 return Max(file_distance(s1, s2), rank_distance(s1, s2));
121 inline File file_from_char(char c) {
122 return File(c - 'a') + FILE_A;
125 inline char file_to_char(File f) {
126 return char(f - FILE_A + int('a'));
129 inline Rank rank_from_char(char c) {
130 return Rank(c - '1') + RANK_1;
133 inline char rank_to_char(Rank r) {
134 return char(r - RANK_1 + int('1'));
137 inline const std::string square_to_string(Square s) {
138 char ch[] = { file_to_char(square_file(s)), rank_to_char(square_rank(s)), 0 };
139 return std::string(ch);
142 inline bool file_is_ok(File f) {
143 return f >= FILE_A && f <= FILE_H;
146 inline bool rank_is_ok(Rank r) {
147 return r >= RANK_1 && r <= RANK_8;
150 inline bool square_is_ok(Square s) {
151 return s >= SQ_A1 && s <= SQ_H8;
154 #endif // !defined(SQUARE_H_INCLUDED)