c++ - 在 C++ 中，当我们创建对象时，构造函数会初始化，但是如果我想再次重新初始化对象，比如在 main 中的某个时刻，该怎么办？

Question

例如我有这个示例代码：

class Player
{
   int grid;
   Player()
   {
      grid = 0;
   }

}
void main()
{
   Player p;
   ...
   ...
   //now again I want to initialize p here, what to write ?
}

如何再次调用 p 的构造函数？

Answer 1

将对象放入本地范围：

while (running)
{
    Player p;  // fresh

    //...
}

每次循环体执行时，Player都会实例化一个新对象。

Answer 2

class Player
{
   int grid;
   Player()
   {
      grid = 0;
   }

}
void main()
{
   Player p;
   ...
   ...
   //now again I want to initialize p here, what to write ?
   p = Player();
}

Answer 3

添加init功能。在构造函数中调用它，但也将其公开，以便您以后可以再次调用它。

实际上你可以做任何你想改变状态的函数：

class Player
{
public:
    void setState(/*anything you want*/) {}
};

Answer 4

加强安德鲁的回答：

class Player
{
public:
    Player()
    {
        reset(); //set initial values to the object
    }

    //Must set initial values to all relevant fields        
    void reset()
    {
        m_grid = 0; //inital value of "m_grid"
    }

private:
    int m_grid;
}


int main()
{
    Player p1;
    Player* p2 = new Player();

    ...
    ...
    p1.reset(); 
    p2->reset(); //Reset my instance without create a new one.
}