stellar

0 #ifndef STELLAR_ATTACK_PAWN_H

1 #define STELLAR_ATTACK_PAWN_H

2

3 #include "bit.hpp"

4 #include "bitboard.hpp"

5 #include "utils.hpp"

6

7 #include <array>

8

9 namespace attack {

10 namespace pawn {

11

12 static constexpr U64 mask_white(const Square square) {

13 U64 bitboard = C64(0);

14

15 bit::set(bitboard, square);

16 return bitboard::noWeOne(bitboard) | bitboard::noEaOne(bitboard);

17 }

18

19 static constexpr U64 mask_black(const Square square) {

20 U64 bitboard = C64(0);

21

22 bit::set(bitboard, square);

23 return bitboard::soWeOne(bitboard) | bitboard::soEaOne(bitboard);

24 }

25

26 typedef std::array<std::array<U64, 64>, 2> attack_array;

27 const auto attacks = []() {

28 attack_array attacks;

29

30 for (Square square = Square::a1; square <= Square::h8; ++square) {

31 attacks[WHITE][square] = mask_white(square);

32 attacks[BLACK][square] = mask_black(square);

33 }

34

35 return attacks;

36 }();

37

38 inline constexpr U64 attack(Color color, Square square) { return attacks[color][square]; }

39

40 } // namespace pawn

41 } // namespace attack

42

43 #endif