接口

C C++

struct ICallBack
{
  int (*func1)(void); //函数指针
  int (*func2)(void); //函数指针
};
struct ICallBack
{
  ICallBack(void){};
  virtual ~ICallBack(){};
  virtual int func1(void){ return 0; }; //虚函数
  virtual int func2(void){ return 0; }; //虚函数
};
struct ICallBack
{
  ICallBack(void){};
  virtual ~ICallBack(void){};
  virtual int func1(void) = 0; //纯虚函数
  virtual int func2(void) = 0; //纯虚函数
};
class ICallBack
{
  public:
    ICallBack(void){};
    virtual ~ICallBack(void){};
    virtual int func1(void){ return 0; }; //虚函数
    virtual int func2(void){ return 0; }; //虚函数
};
class ICallBack
{
  public:
    ICallBack(void){};
    virtual ~ICallBack(void){};
    virtual int func1(void) = 0; //纯虚函数
    virtual int func2(void) = 0; //纯虚函数
};