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
65 ENABLE_OPERATORS_ON(Square)
66 ENABLE_OPERATORS_ON(File)
67 ENABLE_OPERATORS_ON(Rank)
69 inline Square make_square(File f, Rank r) {
70 return Square((int(r) << 3) | int(f));
73 inline File square_file(Square s) {
74 return File(int(s) & 7);
77 inline Rank square_rank(Square s) {
78 return Rank(int(s) >> 3);
81 inline Square flip_square(Square s) {
82 return Square(int(s) ^ 56);
85 inline Square flop_square(Square s) {
86 return Square(int(s) ^ 7);
89 inline Square relative_square(Color c, Square s) {
90 return Square(int(s) ^ (int(c) * 56));
93 inline Rank relative_rank(Color c, Rank r) {
94 return Rank(int(r) ^ (int(c) * 7));
97 inline Rank relative_rank(Color c, Square s) {
98 return relative_rank(c, square_rank(s));
101 inline SquareColor square_color(Square s) {
102 return SquareColor(int(square_rank(s) + s) & 1);
105 inline bool opposite_color_squares(Square s1, Square s2) {
106 int s = int(s1) ^ int(s2);
107 return ((s >> 3) ^ s) & 1;
110 inline int file_distance(Square s1, Square s2) {
111 return abs(square_file(s1) - square_file(s2));
114 inline int rank_distance(Square s1, Square s2) {
115 return abs(square_rank(s1) - square_rank(s2));
118 inline int square_distance(Square s1, Square s2) {
119 return Max(file_distance(s1, s2), rank_distance(s1, s2));
122 inline File file_from_char(char c) {
123 return File(c - 'a') + FILE_A;
126 inline char file_to_char(File f) {
127 return char(f - FILE_A + int('a'));
130 inline Rank rank_from_char(char c) {
131 return Rank(c - '1') + RANK_1;
134 inline char rank_to_char(Rank r) {
135 return char(r - RANK_1 + int('1'));
138 inline const std::string square_to_string(Square s) {
139 char ch[] = { file_to_char(square_file(s)), rank_to_char(square_rank(s)), 0 };
140 return std::string(ch);
143 inline bool file_is_ok(File f) {
144 return f >= FILE_A && f <= FILE_H;
147 inline bool rank_is_ok(Rank r) {
148 return r >= RANK_1 && r <= RANK_8;
151 inline bool square_is_ok(Square s) {
152 return s >= SQ_A1 && s <= SQ_H8;
155 #endif // !defined(SQUARE_H_INCLUDED)