C++指向成員的指針（指向成員的基類）

Question

class Base { int type; }; 
class Derived1 : public Base { ... }; 
class Derived2 : public Base { ... }; 
class Container 
{ 
public: 
    Derived1 f1; 
    Derived2 f2; 
}; 

Container c; 

size_t offset = (size_t) static_cast<Base*>(&reinterpret_cast<Container*>(0)->f2); 
Base* base = reinterpret_cast<Base*>((size_t) c + offset); // ok 

Base Container::* ptr = &Container::f2; // compile error! 
base = c.*ptr; 

是否使用指針指向成員來獲取指向Base的指針的任何有效方法？

Answer 1

這很可能是你正在尋找的偏移和所有相關人員 How to calculate offset of a class member at compile time?