c_cpp cpp c样式​​结构转换

Posted 2021-05-14

// Example program
#include <iostream>

//pointer struct casting in C++ with c style casts

#define Base_HANDLE int type;

struct Base
{
   Base_HANDLE 
};

struct IntObj
{
    Base_HANDLE
    long value;
};

void printType(Base* b)
{
    std::cout << b->type << std::endl;
}



int main()
{
    IntObj* i = new IntObj();
    i->value = 6;
    i->type = 2;
    Base* b = (Base*)i;
    printType(b);
    
    delete i;
}