/// <summary>
/// 得到棋子的类型，是7种类型之一，实际对应着从1到7的整数
/// 通过把它们从0到6编号，可以在编程中减少许多if...else if或switch语句
/// </summary>
/// <param name="piece">棋子的ID号：RED_ROOK,RED_KNIGHT,...RED_KING,BLACK_ROOK,BLACK_KNIGHT,...BLACK_KING</param>
/// <returns>返回TYPE_ROOK,...TYPE_KING这7个整数之一；其它情况都返回-1</returns>
public static int PieceType(int piece)
{
// 提高性能，因为b0,b1,...,b6分别代表不同的棋子，这样只要找到1出现的位置就是棋子的类型
// 参看TYPE_ROOK和RED_ROOK, BLACK_ROOK等常量的定义即可
return(BitHack64.Log2((ulong)piece & 0x7F));
//if (piece == RED_ROOK) return TYPE_ROOK;
//else if (piece == RED_KNIGHT) return TYPE_KNIGHT;
//else if (piece == RED_CANNON) return TYPE_CANNON;
//else if (piece == RED_BISHOP) return TYPE_BISHOP;
//else if (piece == RED_ADVISOR) return TYPE_ADVISOR;
//else if (piece == RED_PAWN) return TYPE_PAWN;
//else if (piece == RED_KING) return TYPE_KING;
//else if (piece == BLACK_ROOK) return TYPE_ROOK;
//else if (piece == BLACK_KNIGHT) return TYPE_KNIGHT;
//else if (piece == BLACK_CANNON) return TYPE_CANNON;
//else if (piece == BLACK_BISHOP) return TYPE_BISHOP;
//else if (piece == BLACK_ADVISOR) return TYPE_ADVISOR;
//else if (piece == BLACK_PAWN) return TYPE_PAWN;
//else if (piece == BLACK_KING) return TYPE_KING;
//else return -1;
}
