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0 #ifndef STELLAR_ATTACK_PAWNB_H

1 #define STELLAR_ATTACK_PAWNB_H

2

3 #include "bit.hpp"

4 #include "bitboard.hpp"

5 #include "square.hpp"

6 #include "utils.hpp"

7

8 #include <array>

9

10 namespace attack {

11 namespace pawnb {

12

13 static constexpr U64 mask(const square::Square square) {

14 U64 bitboard = C64(0);

15

16 bit::set(bitboard, to_underlying(square));

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

18 }

19

20 typedef std::array<U64, 64> attack_array;

21 const attack_array attacks = []() -> attack_array {

22 std::array<U64, 64> attacks;

23 for (uint8_t square = 0; square < 64; square++)

24 attacks[square] = mask(static_cast<square::Square>(square));

25 return attacks;

26 }();

27

28 inline constexpr U64 attack(const square::Square square, U64 occupancy) {

29 return attacks[to_underlying(square)];

30 }

31

32 } // namespace pawnb

33 }; // namespace attack

34

35 #endif