变长数组(指针高级应用)

#include <iostream>
using namespace std;
#pragma pack(1)//禁用字节对齐
struct curData
{
    char data[0];//变长数组，这类应用一般适合于服务器之间转发的协议，节省内存
    //int type;

};
#pragma pack()
int main()
{
    std::cout<<sizeof(curData)<<std::endl;
    curData* myData =  new curData();
    char* curDataTag = myData->data;
    char* myCurData = myData->data;
    *(int*)myCurData = 10;
    //myCurData->data[1] = 16;
    myCurData += sizeof(int);//指针往后移sizeof(int),继续存其它的数据
    *(long long*)myCurData = 8589934592;
    myCurData += sizeof(long long);
    *(long long*)myCurData  = 999999;


    std::cout<<*(int*)(curDataTag)<<std::endl;
    curDataTag += sizeof(int);
    std::cout<<*(long long*)curDataTag<<std::endl;
    curDataTag += sizeof(long long);
    std::cout<<*(long long*)curDataTag<<std::endl;
    return 0;
}