c语言强行面向对象之强行构造函数_#include<iostream> #include<iomanip> #include<cmat-优快云博客

本文链接：https://blog.youkuaiyun.com/Fawkess/article/details/105291027

本文通过实例展示了如何在C语言中使用结构体和函数指针来实现类似面向对象的功能，包括构造函数和成员函数的定义与调用。

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众所周知，c语言是一个面向对象的语言

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#include <iostream>
#include <cstdio>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <cstring>
#include <queue>
#include <set>
#include <vector>
#include <map>
#include <algorithm>
#include <cmath>
#include <stack>
//#include <unordered_map>
//#include <hash_map>

#define INF 0x3f3f3f3f
#define LINF 0x3f3f3f3f3f3f3f3f
#define ll long long
#define ull unsigned long long
#define uint unsigned int

using namespace std;

struct Demo {
	int x, y;

	void(*constructor)(Demo *This);
	void(*member_function1)(Demo *This);
	void(*member_function2)(Demo *This);
}*temp;

void member_function1(Demo *This) {
	printf("fun1\n");
}

void member_function2(Demo *This) {
	printf("fun2\n");
	
}

void construct(Demo *This) {
	printf("construct\n");
	This->constructor = construct;
	This->member_function1 = member_function1;
	This->member_function2 = member_function2;
}

#define TDemo(name)  Demo name;construct(&name);
#define newDemo() (temp = (Demo*)malloc(sizeof(Demo)), construct(temp), temp)

int main() {
	TDemo(temp1);
	temp1.member_function1(&temp1);
	temp1.member_function2(&temp1);

	
	Demo* temp2 = newDemo();
	temp2->member_function1(temp2);

	return 0;
}