Board.original.hpp

/**
 * Header file for the board of the war game.
 * 
 * You can copy this file to a new file called Board.hpp, and extend it as you like.
 * 
 * @author Oz Levi 
 * @author Erel Segal-Halevi
 * @since  2020-05
 */

#include <string>
#include <vector>
#include <stdexcept>
#include "Soldier.hpp"


namespace WarGame {

struct SoldierProxy {
  Soldier*& soldier;
  SoldierProxy(Soldier*& the_soldier): soldier(the_soldier) {}

  operator=(Soldier* new_soldier) {
    if (soldier==nullptr) {
      soldier = new_soldier;
    } else {
      throw _exception("Cannot override a non-null soldier");
    }
  }

  operator Soldier*() {
    return soldier;
  }
};

class Board {
  private:
    std::vector<std::vector<Soldier*>> board;
  public:
    enum MoveDIR { Up, Down, Right, Left };
    
    Board(uint numRows, uint numCols) : 
      board(numRows, std::vector<Soldier*>(numCols, nullptr)) {}

    // operator for putting soldiers on the game-board during initialization.
    SoldierProxy operator[](std::pair<int,int> location) {
        return board[location.first][location.second];
    }
    
    // operator for reading which soldiers are on the game-board.
    Soldier* operator[](std::pair<int,int> location) const;
    
    // The function "move" tries to move the soldier of player "player"
    //     from the "source" location to the "target" location,
    //     and activates the special ability of the soldier.
    // If the move is illegal, it throws "std::invalid_argument". 
    // Illegal moves include:
    //  * There is no soldier in the source location (i.e., the soldier pointer is null);
    //  * The soldier in the source location belongs to the other player.
    //  * There is already another soldier (of this or the other player) in the target location.
    // IMPLEMENTATION HINT: Do not write "if" conditions that depend on the type of soldier!
    // Your code should be generic. All handling of different types of soldiers 
    //      must be handled by polymorphism.
    void move(uint player_number, std::pair<int,int> source, MoveDIR direction);

    // returns true iff the board contains one or more soldiers of the given player.
    bool has_soldiers(uint player_number) const;
    
    //~Board()
    //{
    //  board.clear();
    //}
};

}