return Max(file_distance(s1, s2), rank_distance(s1, s2));
}
+inline File file_from_char(char c) {
+ return File(c - 'a') + FILE_A;
+}
-////
-//// Prototypes
-////
+inline int file_to_char(File f) {
+ return int(f - FILE_A) + 'a';
+}
-extern File file_from_char(char c);
-extern char file_to_char(File f);
-extern Rank rank_from_char(char c);
-extern char rank_to_char(Rank r);
-extern Square square_from_string(const std::string &str);
-extern const std::string square_to_string(Square s);
+inline Rank rank_from_char(char c) {
+ return Rank(c - '1') + RANK_1;
+}
+
+inline int rank_to_char(Rank r) {
+ return int(r - RANK_1) + '1';
+}
-extern bool file_is_ok(File f);
-extern bool rank_is_ok(Rank r);
-extern bool square_is_ok(Square s);
+inline Square square_from_string(const std::string& str) {
+ return make_square(file_from_char(str[0]), rank_from_char(str[1]));
+}
+inline const std::string square_to_string(Square s) {
+ std::string str;
+ str += file_to_char(square_file(s));
+ str += rank_to_char(square_rank(s));
+ return str;
+}
+
+inline bool file_is_ok(File f) {
+ return f >= FILE_A && f <= FILE_H;
+}
+
+inline bool rank_is_ok(Rank r) {
+ return r >= RANK_1 && r <= RANK_8;
+}
+
+inline bool square_is_ok(Square s) {
+ return file_is_ok(square_file(s)) && rank_is_ok(square_rank(s));
+}
#endif // !defined(SQUARE_H_INCLUDED)