标签:c++
函数指针的定义:
头文件:function.h
//该头文件定义了接口,在实际的源文件中定义了模板方法 //后续的调用类只需要实现覆盖before,process,after方法即可实现模板方法的回调 /* extern可置于变量或者函数前,以表示变量或者函数的定义在别的文件中, 提示编译器遇到此变量或函数时,在其它模块中寻找其定义。 */ extern void(*before)(); extern void(*process)(int,int); extern void(*after)(); void my_function(int a,int b);
源文件main.cpp
#include "function.h"
#include <iostream>
using namespace std;
extern void dosth();
//static标记该方法的作用域为该模块(文件)内
static void before_pro()
{
cout << "main.before_pro" << endl;
}
static void process_pro(int a, int b)
{
cout << "main.process_pro" << endl;
}
static void after_pro()
{
cout << "main.after_pro" << endl;
}
//void my_function(int a, int b)
//{
// before();
// process(a, b);
// after();
//}
int main()
{
before = before_pro;
process = process_pro;
after = after_pro;
my_function(2,3);
dosth();
return 0;
}
#include <iostream>
#include "function.h"
using namespace std;
void(*before)();
void(*process)(int, int);
void(*after)();
static void before_pro()
{
cout << "test.before_pro" << endl;
}
static void process_pro(int a, int b)
{
cout << "test.process_pro" << endl;
}
static void after_pro()
{
cout << "test.after_pro" << endl;
}
void dosth()
{
before = before_pro;
process = process_pro;
after = after_pro;
my_function(2, 3);
}
void my_function(int a, int b)
{
before();
process(a, b);
after();
}
版权声明:本文为博主原创文章,未经博主允许不得转载。
标签:c++
原文地址:http://blog.csdn.net/easion_zms/article/details/47021811