CC++ 结构偏移

C/C++ 结构偏移是一种在编程中常用的技术，它允许我们访问结构体中的特定成员变量。结构偏移的概念是基于结构体的内存布局，通过计算成员变量相对于结构体起始地址的偏移量，可以准确地访问结构体的成员。

c
struct Person {
    char name[20];
    int age;
    float height;
};

c
size_t name_offset = offsetof(struct Person, name);
size_t age_offset = offsetof(struct Person, age);
size_t height_offset = offsetof(struct Person, height);

c
struct Person p;
int* age_ptr = (int*)((char*)&p + age_offset);
int age = *age_ptr;

c
struct Person p;
float* height_ptr = (float*)((char*)&p + height_offset);