我在继承函数时遇到问题，我似乎无法弄清楚它为什么会这样，并且无法在其他关于 SO 的问题中找到答案。
我正在开发一个小游戏，继承的函数负责玩家和对象之间的交互，如果玩家试图移动到已经被“障碍”的各种子类之一占据的空间，它将调用该对象的“Bool GetMove”方法，然后执行其独特的规则，如果游戏可以将玩家放置在空间上，则返回 True，否则返回 False。
这是基类标头及其 getmove 方法：
class Obstacle
{
public:
const char* id;
Obstacle* _properlyinitialized; //a pointer that points to the object itself, required by the teacher who gave the assignment.
string Name;
mutable bool Moveable;
int x;
int y;
Obstacle();
Obstacle(string Name, bool Moveable, int x, int y);
virtual ~Obstacle();
bool properlyInitialized();
friend std::ostream& operator<<(std::ostream& stream, Obstacle& Obstacle);
virtual bool getmove(const char*, std::vector<std::vector<std::vector<Obstacle> > >&);
virtual void leavetile(std::vector<std::vector<std::vector<Obstacle> > >&);
};
bool Obstacle::getmove(const char* direction,std::vector<std::vector<std::vector<Obstacle> > >& _board){
cout << "wrong getmove" << endl; //this method should never be called.
return true;
};
继承的类之一及其 getmove 方法：
class Barrel: public Obstacle
{
public:
Barrel():Obstacle(){};
Barrel(string Name, bool Moveable, int x, int y);
~Barrel(){};
bool getmove(const char*, std::vector<std::vector<std::vector<Obstacle> > >&);
void leavetile(std::vector<std::vector<std::vector<Obstacle> > >&);
};
bool Barrel::getmove(const char* direction,std::vector<std::vector<std::vector<Obstacle> > >& _board){
cout << "barrel getmove" << endl;
if(strcmp(direction, "OMHOOG") == 0){ //what direction to move?
if(_board[this->x][this->y-1][0].properlyInitialized()){ //is that object already inhabited by an object?
if(_board[this->x][this->y-1][0].Moveable){ //can the object be moved?
if(_board[this->x][this->y-1][0].getmove(direction, _board){//move the object
_board[this->x][this->y-1][0] = *this; //move the barrel
_board[this->x][this->y-1][0]._properlyinitialized = &_board[this->x][this->y-1][0];
return true; //return true
}
else{
return false; //an object is in the way, the barrel can't be moved
}
}
else{
return false; //an object is in the way, the barrel can't be moved
}
}
else{
_board[this->x][this->y-1][0] = *this; //move the barrel
_board[this->x][this->y-1][0]._properlyinitialized = &_board[this->x][this->y-1][0];
return true; //return true
}
} //This is for direction "up", i left the other directions out because they're almost equal.
该方法调用如下：
//"this" is a board object
if(this->playfield[this->_player->x][(this->_player->y)-1][0].getmove(direction, this->getBoard())){
//do some stuff
}
我考虑过将 Obstacle 对象更改为纯虚拟对象，但我需要其他地方的虚拟“Obstacle”对象，所以这不是一个选项。