自己写的回调函数的注册与使用例子，请多指教

来源：互联网发布：陕西大数据集团前景编辑：程序博客网时间：2024/06/05 06:56

自己写的对回调函数的注册与使用实例，希望高手指教。

#include <iostream>
using namespace std;

#define MAXSIZE 4

enum OPT{ADD, RED, MUL, DIV}; //加，减，乘，除

typedef int (*OptFun)(int, int);

int add(int a, int b)
{
return a + b;
}

int reduce(int a, int b)
{
return a - b;
}

int multiply(int a, int b)
{
return a * b;
}

int divide(int a, int b)
{
if(b != 0)
return a / b;
else
exit(-1);
}

static OptFun cb_fun_list[MAXSIZE] = {add, reduce, multiply, divide};

typedef struct
{
int index;
int (*call_fun)(int, int);
}CALL_BACK_INFO;

int regCBFun(CALL_BACK_INFO *cb_info)
{
if(cb_info)
{
  switch(cb_info->index)
  {
  case ADD:
   cb_info->call_fun = cb_fun_list[ADD];
   break;
  case RED:
   cb_info->call_fun = cb_fun_list[RED];
   break;
  case MUL:
   cb_info->call_fun = cb_fun_list[MUL];
   break;
  case DIV:
   cb_info->call_fun = cb_fun_list[DIV];
   break;
  default:
    break;
   }
  return cb_info->index;
}
return -1;
}

int main()
{
CALL_BACK_INFO cbInfo;
cbInfo.index = MUL;

int cb_fun_id;
int a = 10, b = 4;
if((cb_fun_id = regCBFun(&cbInfo)) != -1)
{
cout << cbInfo.call_fun(a, b) << endl;
}
return 0;
}

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