/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
+ Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
constexpr bool Is64Bit = false;
#endif
-typedef uint64_t Key;
-typedef uint64_t Bitboard;
+using Key = uint64_t;
+using Bitboard = uint64_t;
constexpr int MAX_MOVES = 256;
constexpr int MAX_PLY = 246;
VALUE_MATE_IN_MAX_PLY = VALUE_MATE - MAX_PLY,
VALUE_MATED_IN_MAX_PLY = -VALUE_MATE_IN_MAX_PLY,
+ // In the code, we make the assumption that these values
+ // are such that non_pawn_material() can be used to uniquely
+ // identify the material on the board.
PawnValueMg = 126, PawnValueEg = 208,
KnightValueMg = 781, KnightValueEg = 854,
BishopValueMg = 825, BishopValueEg = 915,
VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg, VALUE_ZERO, VALUE_ZERO }
};
-typedef int Depth;
+using Depth = int;
enum : int {
DEPTH_QS_CHECKS = 0,
return Color(pc >> 3);
}
+constexpr bool is_ok(Move m) {
+ return m != MOVE_NONE && m != MOVE_NULL;
+}
+
constexpr bool is_ok(Square s) {
return s >= SQ_A1 && s <= SQ_H8;
}
}
constexpr Square from_sq(Move m) {
+ assert(is_ok(m));
return Square((m >> 6) & 0x3F);
}
constexpr Square to_sq(Move m) {
+ assert(is_ok(m));
return Square(m & 0x3F);
}
constexpr int from_to(Move m) {
- return m & 0xFFF;
+ return m & 0xFFF;
}
constexpr MoveType type_of(Move m) {
return Move((from << 6) + to);
}
-constexpr Move reverse_move(Move m) {
- return make_move(to_sq(m), from_sq(m));
-}
-
template<MoveType T>
constexpr Move make(Square from, Square to, PieceType pt = KNIGHT) {
return Move(T + ((pt - KNIGHT) << 12) + (from << 6) + to);
}
-constexpr bool is_ok(Move m) {
- return from_sq(m) != to_sq(m); // Catch MOVE_NULL and MOVE_NONE
-}
-
/// Based on a congruential pseudo random number generator
constexpr Key make_key(uint64_t seed) {
return seed * 6364136223846793005ULL + 1442695040888963407ULL;