guohai

#define DECLARE_ENUM(E) struct E { public: E(int value = 0) : _value((__Enum)value) { } E& operator=(int value) { this->_value = (__Enum)value; return *this; } operator int() const { return this->_value; } enum __Enum {
#define END_ENUM() }; private: __Enum _value; };

#include <iostream>

using namespace std;

class B {
    B &operator=(const B &);
};