offset求结构体成员的偏移量

最新推荐文章于 2022-07-26 17:17:36 发布

爱不到要偷

最新推荐文章于 2022-07-26 17:17:36 发布

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原文链接：http://www.cnblogs.com/hellogiser/p/struct-offset.html

【代码】

     C++ Code  
  

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/*
version: 1.0
author: hellogiser
blog: http://www.cnblogs.com/hellogiser
date: 2014/9/25
*/

#include "stdafx.h"
#include <iostream>
using namespace std;

#define OFFSET(s,m) (( int )(&(((s*) 0 )->m)))
struct MyStruct
{
     int a;
     int b;
     int c;
};

void test_offset()
{
    cout << OFFSET(MyStruct, a) << endl; // 0
    cout << OFFSET(MyStruct, b) << endl; // 4
    cout << OFFSET(MyStruct, c) << endl; // 8
}

int main()
{
    test_offset();
     return 0 ;
}

转载于:https://www.cnblogs.com/hellogiser/p/struct-offset.html