回调函数最简单用法

回调函数最简单用法

#include <iostream>
using namespace std;
 
 
int toZeroDown(int n, void *contex) {
	cout  << "toZeroDown:" << -*(int*)(contex) << endl;
	return 0;
}
 
int toZeroUp(int n, void *contex) {
	cout << "toZeroUp:" << *(int*)(contex) << endl;
	return 0;
}
 
typedef int(*CallBackFunc)(int n, void *contex);
 
void registNumCallBack(CallBackFunc callback, void *contex)
{
	int n = 3;
	callback(n, contex);
}
 
int main()
{
	for (int i = 0; i < 10; i++)
	{
		if (i % 2) {
			registNumCallBack(toZeroDown, &i);
		}
		else
		{
			registNumCallBack(toZeroUp, &i);
		}
	}
	
}