queen.h

Data Abstraction & Problem Solving with C++源码

// ****************************************************
// Header file Queen.h 
// ****************************************************

#ifndef QUEEN_H
#define QUEEN_H

class Board;

class Queen {
public:
    Queen();              // Puts queen in upper left corner of board.
    Queen(int inRow, int inCol);  // Places Queen in supplied location.

    int getCol() const;           // Returns column number.  
    int getRow() const;           // Returns row number.        
    void nextRow();               // Moves queen to next row.

    bool isUnderAttack() const;
    // Determines whether the queen is under attack by another queen.
    // If there is a queen in the same row or the same diagonal, 
    // returns true; otherwise, returns false.
 
    static void setBoard(const Board *bPtr);
    // Saves a pointer to the board for all queens.
private:
    // Row and column of queen if it is on the board. 
    // Otherwise, prospective row and column of queen. 
    int row;
    int col;
    
    static const Board *boardPtr; // All queens share the same board.

};

#endif