Move methods from Board to BitBoard

BitBoard.cpp

@@ -1,102 +1,9 @@
-#include <iostream>
 #include "BitBoard.h"
 
-//BitBoard::BitBoard() {
-//    mBoard = 0;
-//}
-
 BitBoard::BitBoard(uint64_t v) {
     mBoard = v;
 }
 
-BitBoard::operator bool() const {
-    return mBoard != 0;
-}
-
-BitBoard::operator unsigned long long() const {
-    return mBoard;
-}
-
-bool BitBoard::operator==(const BitBoard &rhs) const {
-    return mBoard == rhs.mBoard;
-}
-
-bool BitBoard::operator!=(const BitBoard &rhs) const {
-    return !(rhs == *this);
-}
-
-bool BitBoard::operator<(const BitBoard &rhs) const {
-    return mBoard < rhs.mBoard;
-}
-
-bool BitBoard::operator>(const BitBoard &rhs) const {
-    return rhs < *this;
-}
-
-bool BitBoard::operator<=(const BitBoard &rhs) const {
-    return !(rhs < *this);
-}
-
-bool BitBoard::operator>=(const BitBoard &rhs) const {
-    return !(*this < rhs);
-}
-
-BitBoard &BitBoard::operator&=(const BitBoard &rhs) {
-    mBoard &= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator|=(const BitBoard &rhs) {
-    mBoard |= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator^=(const BitBoard &rhs) {
-    mBoard ^= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator<<=(const BitBoard &rhs) {
-    mBoard <<= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator>>=(const BitBoard &rhs) {
-    mBoard >>= rhs.mBoard;
-    return *this;
-}
-
-BitBoard BitBoard::operator~() {
-    BitBoard result(*this);
-    result.mBoard = ~mBoard;
-    return result;
-}
-
-BitBoard &BitBoard::operator+=(const BitBoard &rhs) {
-    mBoard += rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator-=(const BitBoard &rhs) {
-    mBoard -= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator*=(const BitBoard &rhs) {
-    mBoard *= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator/=(const BitBoard &rhs) {
-    mBoard /= rhs.mBoard;
-    return *this;
-}
-
-BitBoard &BitBoard::operator%=(const BitBoard &rhs) {
-    mBoard %= rhs.mBoard;
-    return *this;
-}
-
 std::ostream &operator<<(std::ostream &os, const BitBoard &board) {
     // For debugging only, performance isn't important
     for (int i = 7; i >= 0; i--) {
@@ -117,64 +24,10 @@ std::ostream &operator<<(std::ostream &os, const BitBoard &board) {
 
     return os;
 }
-bool BitBoard::operator!() const {
-    return !mBoard;
-}
 
-bool BitBoard::operator&&(const BitBoard &rhs) const {
-    return mBoard && rhs.mBoard;
+BitBoard BitBoard::getRank(int r) {
+    return (genShift(1ULL, (r + 1) * 8) - 1) & genShift(~1ULL, r * 8 - 1);
 }
-
-bool BitBoard::operator||(const BitBoard &rhs) const {
-    return mBoard || rhs.mBoard;
-}
-BitBoard::operator void *() const {
-    return (void *) mBoard;
-}
-
-BitBoard operator&(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result &= rhs;
-    return result;
-}
-
-BitBoard operator|(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result |= rhs;
-    return result;
-}
-
-BitBoard operator^(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result ^= rhs;
-    return result;
-}
-BitBoard operator<<(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result <<= rhs;
-    return result;
-}
-
-BitBoard operator>>(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result >>= rhs;
-    return result;
-}
-
-BitBoard operator-(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result -= rhs;
-    return result;
-}
-
-BitBoard operator*(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result *= rhs;
-    return result;
-}
-
-BitBoard operator%(const BitBoard &lhs, const BitBoard &rhs) {
-    BitBoard result(lhs);
-    result %= rhs;
-    return result;
+BitBoard BitBoard::genShift(BitBoard x, const int s) {
+    return (s < 0) ? (x >> -s) : (s > 63) ? x : (x << s);
 }

BitBoard.h

@@ -3,62 +3,206 @@
 
 #include <cstdint>
 #include <ostream>
-#include "CastlingRights.hpp"
 
 class BitBoard final {
 public:
     using U64 = uint64_t;
 
-    BitBoard(uint64_t v = 0);
+    BitBoard(U64 v = 0);
 
-//    explicit operator uint64_t() const;
-    explicit operator bool() const;
-    explicit operator unsigned long long() const;
-    operator void*() const;
+    explicit constexpr operator bool() const {
+        return mBoard != 0;
+    }
+    explicit constexpr operator unsigned long long() const {
+        return mBoard;
+    }
+    operator void *() const {
+        return (void *) mBoard;
+    }
 
-    bool operator==(const BitBoard &rhs) const;
-    bool operator!=(const BitBoard &rhs) const;
-    bool operator<(const BitBoard &rhs) const;
-    bool operator>(const BitBoard &rhs) const;
-    bool operator<=(const BitBoard &rhs) const;
-    bool operator>=(const BitBoard &rhs) const;
+    // Relational operators
+    constexpr bool operator==(const BitBoard &rhs) const;
+    constexpr bool operator!=(const BitBoard &rhs) const;
+    constexpr bool operator<(const BitBoard &rhs) const;
+    constexpr bool operator>(const BitBoard &rhs) const;
+    constexpr bool operator<=(const BitBoard &rhs) const;
+    constexpr bool operator>=(const BitBoard &rhs) const;
 
-    // bitset operations
-    BitBoard &operator&=(const BitBoard &rhs);
-    BitBoard &operator|=(const BitBoard &rhs);
-    BitBoard &operator^=(const BitBoard &rhs);
-    BitBoard &operator<<=(const BitBoard &rhs);
-    BitBoard &operator>>=(const BitBoard &rhs);
-    BitBoard operator~();
+    // Logical operators
+    constexpr bool operator!() const;
+    constexpr bool operator&&(const BitBoard &rhs) const;
+    constexpr bool operator||(const BitBoard &rhs) const;
 
-    bool operator!() const;
-    bool operator&&(const BitBoard &rhs) const;
-    bool operator||(const BitBoard &rhs) const;
+    // Bitwise operators
+    constexpr BitBoard &operator&=(const BitBoard &rhs);
+    constexpr BitBoard &operator|=(const BitBoard &rhs);
+    constexpr BitBoard &operator^=(const BitBoard &rhs);
+    constexpr BitBoard &operator<<=(const BitBoard &rhs);
+    constexpr BitBoard &operator>>=(const BitBoard &rhs);
+    BitBoard operator~() const {
+        BitBoard result(*this);
+        result.mBoard = ~mBoard;
+        return result;
+    }
+    friend BitBoard operator^(const BitBoard &lhs, const BitBoard &rhs);
+    friend BitBoard operator|(const BitBoard &lhs, const BitBoard &rhs);
+    friend BitBoard operator&(const BitBoard &lhs, const BitBoard &rhs);
+    friend BitBoard operator<<(const BitBoard &lhs, const BitBoard &rhs);
+    friend BitBoard operator>>(const BitBoard &lhs, const BitBoard &rhs);
 
-    BitBoard &operator+=(const BitBoard &rhs);
-    BitBoard &operator-=(const BitBoard &rhs);
-    BitBoard &operator*=(const BitBoard &rhs);
-    BitBoard &operator/=(const BitBoard &rhs);
-    BitBoard &operator%=(const BitBoard &rhs);
+    // Arithmetic operators
+    constexpr BitBoard &operator+=(const BitBoard &rhs);
+    constexpr BitBoard &operator-=(const BitBoard &rhs);
+    constexpr BitBoard &operator%=(const BitBoard &rhs);
+    friend BitBoard operator+(const BitBoard &lhs, const BitBoard &rhs);
+    friend BitBoard operator-(const BitBoard &lhs, const BitBoard &rhs);
+    friend BitBoard operator%(const BitBoard &lhs, const BitBoard &rhs);
 
+    // Stream operator
     friend std::ostream &operator<<(std::ostream &os, const BitBoard &board);
-//    friend bool operator&&(const bool &lhs, const BitBoard &rhs);
+
+    constexpr void clear(unsigned i);
+    constexpr void set(unsigned i);
+    BitBoard left(unsigned i) const;
+    BitBoard right(unsigned i) const;
+    static BitBoard fromIndex(unsigned i);
+
+    static BitBoard genShift(BitBoard x, int s);
+    static BitBoard getRank(int r);
+
+    // Returns the number of trailing 0-bits in b.
+    // WARN: Check for 0!
+    int lsb() const;
 
 private:
     U64 mBoard = {};
 
 };
 
+// Relational operators
+constexpr bool BitBoard::operator==(const BitBoard &rhs) const {
+    return mBoard == rhs.mBoard;
+}
+constexpr bool BitBoard::operator!=(const BitBoard &rhs) const {
+    return !(rhs == *this);
+}
+constexpr bool BitBoard::operator<(const BitBoard &rhs) const {
+    return mBoard < rhs.mBoard;
+}
+constexpr bool BitBoard::operator>(const BitBoard &rhs) const {
+    return rhs < *this;
+}
+constexpr bool BitBoard::operator<=(const BitBoard &rhs) const {
+    return !(rhs < *this);
+}
+constexpr bool BitBoard::operator>=(const BitBoard &rhs) const {
+    return !(*this < rhs);
+}
 
-BitBoard operator^(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator|(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator&(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator<<(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator>>(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator+(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator-(const BitBoard &lhs, const BitBoard &rhs);
-//BitBoard operator*(const BitBoard &lhs, const BitBoard &rhs);
-//BitBoard operator/(const BitBoard &lhs, const BitBoard &rhs);
-BitBoard operator%(const BitBoard &lhs, const BitBoard &rhs);
+// Logical operators
+constexpr bool BitBoard::operator!() const {
+    return !mBoard;
+}
+constexpr bool BitBoard::operator&&(const BitBoard &rhs) const {
+    return mBoard && rhs.mBoard;
+}
+constexpr bool BitBoard::operator||(const BitBoard &rhs) const {
+    return mBoard || rhs.mBoard;
+}
+
+// Bitwise operators
+constexpr BitBoard &BitBoard::operator&=(const BitBoard &rhs) {
+    mBoard &= rhs.mBoard;
+    return *this;
+}
+constexpr BitBoard &BitBoard::operator|=(const BitBoard &rhs) {
+    mBoard |= rhs.mBoard;
+    return *this;
+}
+constexpr BitBoard &BitBoard::operator^=(const BitBoard &rhs) {
+    mBoard ^= rhs.mBoard;
+    return *this;
+}
+constexpr BitBoard &BitBoard::operator<<=(const BitBoard &rhs) {
+    mBoard <<= rhs.mBoard;
+    return *this;
+}
+constexpr BitBoard &BitBoard::operator>>=(const BitBoard &rhs) {
+    mBoard >>= rhs.mBoard;
+    return *this;
+}
+inline BitBoard operator^(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result ^= rhs;
+    return result;
+}
+inline BitBoard operator|(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result |= rhs;
+    return result;
+}
+inline BitBoard operator&(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result &= rhs;
+    return result;
+}
+inline BitBoard operator<<(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result <<= rhs;
+    return result;
+}
+inline BitBoard operator>>(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result >>= rhs;
+    return result;
+}
+
+// Arithmetic operators
+constexpr BitBoard &BitBoard::operator+=(const BitBoard &rhs) {
+    mBoard += rhs.mBoard;
+    return *this;
+}
+constexpr BitBoard &BitBoard::operator-=(const BitBoard &rhs) {
+    mBoard -= rhs.mBoard;
+    return *this;
+}
+constexpr BitBoard &BitBoard::operator%=(const BitBoard &rhs) {
+    mBoard %= rhs.mBoard;
+    return *this;
+}
+inline BitBoard operator+(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result += rhs;
+    return result;
+}
+inline BitBoard operator-(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result -= rhs;
+    return result;
+}
+inline BitBoard operator%(const BitBoard &lhs, const BitBoard &rhs) {
+    BitBoard result(lhs);
+    result %= rhs;
+    return result;
+}
+
+constexpr void BitBoard::set(const unsigned i) {
+    mBoard |= (1ULL << i);
+}
+constexpr void BitBoard::clear(const unsigned i) {
+    mBoard &= ~(1ULL << i);
+}
+inline BitBoard BitBoard::fromIndex(const unsigned i) {
+    return 1ULL << i;
+}
+inline BitBoard BitBoard::left(const unsigned int i) const {
+    return (mBoard >> i);
+}
+inline BitBoard BitBoard::right(const unsigned int i) const {
+    return (mBoard << i);
+}
+inline int BitBoard::lsb() const {
+    return __builtin_ctzll(mBoard);
+}
 
 #endif //CHESS_ENGINE_BITBOARD_HPP

Board.cpp

@@ -16,16 +16,16 @@ void Board::setPiece(const Square &square, const Piece::Optional &piece) {
 
     auto index = square.index();
     for (auto &bb : mPieceBBs) {
-        clearIndex(bb, index);
+        bb.clear(index);
     }
 
-    setIndex(mPieceBBs[toIndex(piece->type())], index);
-    setIndex(mPieceBBs[toIndex(piece->color())], index);
-    setIndex(mOccupiedBB, index);
+    mPieceBBs[toIndex(piece->type())].set(index);
+    mPieceBBs[toIndex(piece->color())].set(index);
+    mOccupiedBB.set(index);
 }
 
 Piece::Optional Board::piece(const Square &square) const {
-    BitBoard mask = indexToBitBoard(square.index());
+    BitBoard mask = BitBoard::fromIndex(square.index());
     if (!(mOccupiedBB & mask)) {
         return std::nullopt;
     }
@@ -63,8 +63,8 @@ Square::Optional Board::enPassantSquare() const {
 
 void Board::makeMove(const Move &move) {
 
-    BitBoard fromBB = indexToBitBoard(move.from().index());
-    BitBoard toBB = indexToBitBoard(move.to().index());
+    BitBoard fromBB = BitBoard::fromIndex(move.from().index());
+    BitBoard toBB = BitBoard::fromIndex(move.to().index());
     BitBoard changeBB = fromBB ^ toBB;
 
     // If Piece is captured
@@ -119,7 +119,7 @@ void Board::makeMove(const Move &move) {
 }
 void Board::handleEnPassant(const Move &move, const Piece &movedPiece) {
     if (movedPiece.type() == PieceType::Pawn && mEPS.has_value() && move.from().file() != move.to().file()) {
-        auto epBB = indexToBitBoard(Square::fromCoordinates(move.to().file(), move.from().rank())->index());
+        auto epBB = BitBoard::fromIndex(Square::fromCoordinates(move.to().file(), move.from().rank())->index());
         auto capturedPiece = Piece(!mTurn, PieceType::Pawn);
 
         mPieceBBs[toIndex(capturedPiece.color())] ^= epBB;
@@ -133,7 +133,7 @@ void Board::handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &
         auto fromR = move.from().rank();
         auto toR = move.to().rank();
         auto diff = abs(static_cast<int>(fromR) - static_cast<int>(toR));
-        if (diff == 2 && (mPieceBBs[toIndex(PieceType::Pawn)] & (bb << 1 | bb >> 1) & getRankBB(static_cast<int>(toR)))) {
+        if (diff == 2 && (mPieceBBs[toIndex(PieceType::Pawn)] & (bb.left(1) | bb.right(1)) & BitBoard::getRank(static_cast<int>(toR)))) {
             mEPS = Square::fromCoordinates(move.to().file(), std::max(fromR, toR) - 1);
             return;
         }
@@ -193,10 +193,10 @@ bool Board::isMoveCastling(const BitBoard &from, const BitBoard &to, const Piece
     }
 
     if (piece.color() == PieceColor::White) {
-        return (from & indexToBitBoard(E1));
+        return (from & BitBoard::fromIndex(E1));
     }
 
-    return from & indexToBitBoard(E8);
+    return from & BitBoard::fromIndex(E8);
 }
 
 std::ostream &operator<<(std::ostream &os, const Board &board) {

Board.hpp

@@ -67,26 +67,6 @@ private:
     // Check if the move is castling without checking the rights or validity.
     static bool isMoveCastling(const BitBoard &from, const BitBoard &to, const Piece &piece);
 
-    static inline void clearIndex(BitBoard &b, const unsigned i) {
-        b &= ~(1ULL << i);
-    }
-
-    static inline void setIndex(BitBoard &b, const unsigned i) {
-        b |= 1ULL << i;
-    }
-
-    static inline BitBoard indexToBitBoard(const unsigned i) {
-        return (1ULL << i);
-    }
-
-    static inline BitBoard genShift(BitBoard x, const int s) {
-        return (s < 0) ? (x >> -s) : (s > 63) ? x : (x << s);
-    }
-
-    static inline BitBoard getRankBB(int r) {
-        return (genShift(1ULL, (r + 1) * 8) - 1) & genShift(~1ULL, r * 8 - 1);
-    }
-
     static inline int toIndex(PieceType t) {
         return static_cast<int>(t);
     }
@@ -114,18 +94,6 @@ private:
         return static_cast<PieceType>(0);
     }
 
-    inline void applyMask(const BitBoard &mask) {
-        for (auto &item : mPieceBBs) {
-            item ^= mask;
-        }
-    }
-
-    // Returns the number of trailing 0-bits in b.
-    // WARN: Check for 0!
-    static inline int getLSB(const BitBoard b) {
-        return __builtin_ctzll(static_cast<unsigned long long>(b));
-    }
-
     void handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &movedPiece);
     void handleEnPassant(const Move &move, const Piece &movedPiece);
 };