gameboard.cpp

C++高级编程这本书所附的源代码

// GameBoard.cpp
#include "GameBoard.h"

// Microsoft Visual Studio requires you to omit the following two lines.
// However, some compilers require them.
//const int GameBoard::kDefaultWidth;
//const int GameBoard::kDefaultHeight;

GameBoard::GameBoard(int inWidth, int inHeight) :
  mWidth(inWidth), mHeight(inHeight)
{
  mCells = new GamePiece* [mWidth];
  for (int i = 0; i < mWidth; i++) {
    mCells[i] = new GamePiece[mHeight];
  }
}

GameBoard::GameBoard(const GameBoard& src)
{
  copyFrom(src);
}

GameBoard::~GameBoard()
{
  // free the old memory
  for (int i = 0; i < mWidth; i++) {
    delete [] mCells[i];
  }

  delete [] mCells;
}

void GameBoard::copyFrom(const GameBoard& src)
{
  int i, j;
  mWidth = src.mWidth;
  mHeight = src.mHeight;

  mCells = new GamePiece* [mWidth];
  for (i = 0; i < mWidth; i++) {
    mCells[i] = new GamePiece[mHeight];
  }
  for (i = 0; i < mWidth; i++) {
    for (j = 0; j < mHeight; j++) {
      mCells[i][j] = src.mCells[i][j];
    }
  }
}

GameBoard& GameBoard::operator=(const GameBoard& rhs)
{
  // check for self-assignment
  if (this == &rhs) {
    return (*this);
  }
  // free the old memory
  for (int i = 0; i < mWidth; i++) {
    delete [] mCells[i];
  }
  delete [] mCells;

  // copy the new memory
  copyFrom(rhs);

  return (*this);
}

void GameBoard::setPieceAt(int x, int y, const GamePiece& inElem)
{
  mCells[x][y] = inElem;
}

GamePiece& GameBoard::getPieceAt(int x, int y)
{
  return (mCells[x][y]);
}

const GamePiece& GameBoard::getPieceAt(int x, int y) const
{
  return (mCells[x][y]);
}