offset求结构体成员的偏移量

【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;
}

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