虚函数表学习

最新推荐文章于 2024-11-21 14:05:52 发布

原创最新推荐文章于 2024-11-21 14:05:52 发布 · 125 阅读

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博客聚焦于虚函数表学习，但具体内容缺失。虚函数表是信息技术领域重要概念，在面向对象编程等方面有重要应用。


**#include <string.h>
#include <stdio.h>
#include <iostream>
#include <stdint.h>
class v_table
{
	public:
		virtual void f() {std::cout << "virtual func f" << std::endl;}
		virtual void g() {std::cout << "virtual func g" << std::endl;}
		virtual void h() {std::cout << "virtual func h" << std::endl;}
		void m() {std::cout << "func m" << std::endl;;}
};
class v_table1 : public v_table
{
	public:
		virtual void f1() {std::cout << "virtual func f1" << std::endl;}
		virtual void g1() {std::cout << "virtual func g1" << std::endl;}
		virtual void h1() {std::cout << "virtual func h1" << std::endl;}
};
int main (int argc ,char * argv[])
{
	printf("*************************************\n");
	class v_table test;
	printf("虚函数表地址\t %p \n",(int64_t*)*(int64_t*)&test);
	printf("虚函数表第1个函数地址\t %p \n",(int64_t*)*(int64_t*)*(int64_t*)&test);
	printf("虚函数表第2个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test +1));
	printf("虚函数表第3个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test +2));
	Fun pfun = (Fun)*(int64_t*)*(int64_t *)&test;
	pfun();
	pfun = NULL;
	pfun = (Fun)*((int64_t*)*(int64_t *)(&test)+1);
	pfun();
	pfun = NULL;
	pfun = (Fun)*((int64_t*)*(int64_t *)&test+2);
	pfun();
	class v_table1 test_drive;
	printf("drive_test\n");
	printf("虚函数表地址\t %p \n",(int64_t*)*(int64_t *)&test_drive);
	printf("虚函数表第1个函数地址\t %p \n",(int64_t*)*(int64_t*)*(int64_t*)&test_drive);
	printf("虚函数表第2个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test_drive +1));
	printf("虚函数表第3个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test_drive +2));
	printf("虚函数表第4个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test_drive +3));
	printf("虚函数表第5个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test_drive +4));
	printf("虚函数表第6个函数地址\t %p \n",(int64_t*)*((int64_t*)*(int64_t*)&test_drive +5));
	//pfun = NULL;
	pfun = (Fun)*((int64_t*)*(int64_t *)&test_drive+5);
	pfun();
	return 0;
}**

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