我讀了很多關於純虛擬呼叫的錯誤,但我也沒弄明白什麼是錯我的代碼:訪問分段故障到現場使用純虛擬函數
我編程,國際象棋遊戲,使用多態。
這裏的一些代碼:
Piece.hpp(母公司爲所有的遊戲作品)
class Piece
{
private:
char _player;
virtual int isMoveLegalForSpecificPiece(int positionRow, int positionCol, int targetRow,
int targetCol, Piece *board[8][8]) = 0;
public:
~Piece()
{
}
Piece(char player);
virtual int isMoveLegal(int positionRow, int positionCol, int targetRow, int targetCol,
Piece *board[8][8]);
char getPlayer();
virtual char getSign() const = 0;
virtual std::string getUnicodeSymbol() const = 0;
};
Rook.hpp(例如)
#include "Piece.hpp"
class Rook : public virtual Piece {
private:
std::string _unicode = "265C";
virtual int isMoveLegalForSpecificPiece(int positionRow, int positionCol, int targetRow,
int targetCol, Piece *board[8][8]);
public:
Rook(char player) : Piece(player){}
~Rook() {}
virtual std::string getUnicodeSymbol() const;
char getSign() const;
};
和Rook.cpp
#include "Rook.hpp"
char Rook::getSign() const {return 'r';}
int Rook::isMoveLegalForSpecificPiece(int positionRow, int positionCol, int targetRow,
int targetCol, Piece *board[8][8]) {
if (positionRow == targetRow) {
int rightOrLeft = (targetCol - positionCol > 0) ? 1 : -1;
for (int i = positionCol + rightOrLeft; i != targetCol; i += rightOrLeft) {
if (board[positionRow][i] != 0) {return 0; }
}
return 1;
}
else if (positionCol == targetCol) {
int upOrDown = (targetRow - positionRow > 0) ? 1 : -1;
for (int i = positionRow + upOrDown; i != targetRow; i += upOrDown) {
if (board[i][positionCol] != 0) {return 0;}
}
return 1;
}
return 0;
}
std::string Rook::getUnicodeSymbol() const {return _unicode;}
Board ::委員會()
Board::Board() {
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 8; j++) {
board[i][j] = 0;
}
}
for (int i = 0; i < 8; i++) {
board[1][i] = new Pawn('w');
board[6][i] = new Pawn('b');
}
board[7][0] = new Rook('b');
board[0][0] = new Rook('w');
board[7][1] = new Knight('b');
board[0][1] = new Knight('w');
board[7][2] = new Bishop('b');
board[0][2] = new Bishop('w');
board[7][3] = new King('b');
board[0][3] = new King('w');
board[7][4] = new Queen('b');
board[0][4] = new Queen('w');
board[7][5] = new Bishop('b');
board[0][5] = new Bishop('w');
board[7][6] = new Knight('b');
board[0][6] = new Knight('w');
board[7][7] = new Rook('b');
board[0][7] = new Rook('w');
}
局::打印
void Board::print() {
printRowLetters();
for (int i = 7; i >= 0; i--){
cout << (char) ('1' + i) << " ";
for (int j = 7; j >= 0; j--) {
string isColor = "0";
string pieceUnicode = " ";
if (board[i][j]) {
isColor = (board[i][j]->getPlayer() == 'w') ? "37" : "30";
pieceUnicode = board[i][j]->getUnicodeSymbol();
}
//some more code..
}
}
}
卻困在該行:
pieceUnicode =板[i] [j] - > getUnicodeSymbol( );
我得到:
純虛方法稱爲
我沒有叫構造函數和析構函數
中的函數把virtual
關鍵字上述~Piece()
析構函數後,這個問題解決了。但是,現在在同一行,我得到
信號:SIGSEGV(分段故障)
什麼想法?
這裏多一些信息:
我宣佈董事會內部象棋的主。cpp:
Board boardGame;
然後我送爲void瑣事(板棋盤遊戲)是這樣的:
瑣事(棋盤遊戲);
和內部我送爲void getNextMove(局板,串whitePlayer,串blackPlayer)所示:
getNextMove(棋盤遊戲,whitePlayer,blackPlayer);
,然後我使用:
boardGame.print();
TL; DR;創建抽象類'virtual'的析構函數:'virtual〜Piece(){}'。 –
@πάνταῥεῖ謝謝!現在我得到Signal:SIGSEGV(Segmentation fault)。任何想法? –
@AviadLevy越界訪問(看起來可能)? –