Similar to nginx, a function linked list is generated when compiling

The following code may require a certain c/c++ foundation.

You need to have some knowledge of function pointers

Click here for in-depth analysis of function pointers

common.h

#pragma once
typedef int (*pt)(void);
void init_2();

2.cpp

#include <iostream>
#include "common.h"
using namespace std;
static pt next_pt;
extern pt top_pt;
int filter_2()
{
    cout 1.cpp
<pre name="code">#include <iostream>
#include "common.h"
using namespace std;
static pt next_pt;
pt top_pt;

static int filter_1()
{
    cout compilation command
<p>g++ 1.cpp 2.cpp -g -O0</p>
<p>Execute </p>
<p>./a.out</p>
<p>filter_2<br>filter_1<br>If you have already programmed and executed successfully, please continue reading. </p>
<p>top_pt is a global variable</p>
<p> next_pt is a local global variable</p>
<p>If you want to know</p>
<p>top_pt will change every time the code is executed, constantly pointing to the head of the new linked list. Through the continuous execution of the init_* function, a linked list is generated. It looks like a single-linked list composed of global variables. </p>
<p>Okay, it’s another weird and obscene technique, that’s all! <br></p>
                
                
                <p>
                    The above has introduced the function linked list generated by nginx during compilation, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials. </p>
                <p>
                    </p></iostream>