一个class的定义问题??

lc1999

class RefCounted
{
public:
    void IncRef() = 0;
    bool DecRef() = 0; // if you DecRef() to zero
        // references, the object is destroyed
        // automatically and DecRef() returns true
    virtual ~RefCounted() {}
};



如上的class定义中,
void IncRef() = 0;
    bool DecRef() = 0;

这两句是什么意思??

谢谢!

A0110A

纯虚函数

THEBEST

class RefCounted
{
   public:
      virtual      void IncRef() = 0;
      virtual     bool DecRef() = 0; // if you DecRef() to zero
      // references, the object is destroyed
      // // automatically and DecRef() returns true
      virtual ~RefCounted() {}
};

是这样的.