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0 #ifndef STELLAR_BIT_H

1 #define STELLAR_BIT_H

2

3 #include "utils.hpp"

4 #include <bit>

5

6 namespace bit {

7

8 inline constexpr bool get(const U64 &bitboard, uint8_t square) { return (bitboard >> square) & C64(1); }

9 inline constexpr void set(U64 &bitboard, uint8_t square) { bitboard |= (C64(1) << square); }

10 inline constexpr void pop(U64 &bitboard, uint8_t square) { bitboard &= ~(C64(1) << square); }

11

12 inline constexpr uint8_t count(U64 bitboard) { return std::popcount(bitboard); }

13 inline constexpr uint8_t lsb_index(U64 bitboard) { return std::countr_zero(bitboard); }

14 inline constexpr U64 &lsb_pop(U64 &bitboard) { return bitboard = bitboard & (bitboard - 1); }

15

16 #define bitboard_for_each_bit(var, bb) \

17 for (var = bit::lsb_index(bb); bb; bit::lsb_pop(bb), var = bit::lsb_index(bb))

18

19 } // namespace bit

20

21 #endif