class TrickyClass {
public:
    int data;
    
    // 重載的 operator& 返回假地址
    TrickyClass* operator&() { 
        return reinterpret_cast<TrickyClass*>(0xDEADBEEF); 
    }
};

int main() {
    TrickyClass obj;
    TrickyClass* addr = &obj;  // 返回 0xDEADBEEF，不是真實(shí)地址!
}

template<typename T>
T* addressof(T& arg) noexcept {
    return reinterpret_cast<T*>(
        &const_cast<char&>(
            reinterpret_cast<const volatile char&>(arg)
        )
    );
}

#include <iostream>
#include <memory>  // 用于 std::addressof

// 重載了 operator& 的示例類
class TrickyClass {
public:
    int data{42};
    
    // 重載的 operator& 返回假地址
    TrickyClass* operator&() { 
        std::cout << "重載的 operator& 被調(diào)用\n";
        return reinterpret_cast<TrickyClass*>(0xDEADBEEF); 
    }
    
    // const 版本的重載
    const TrickyClass* operator&() const { 
        std::cout << "const 重載的 operator& 被調(diào)用\n";
        return reinterpret_cast<const TrickyClass*>(0xDEADBEEF); 
    }
};

// 獲取真實(shí)地址的通用函數(shù) (C++98 兼容)
template <typename T>
T* get_real_address(T& obj) {
    return reinterpret_cast<T*>(
        &const_cast<char&>(
            reinterpret_cast<const volatile char&>(obj)
        )
    );
}

int main() {
    TrickyClass obj;
    const TrickyClass const_obj;
    
    std::cout << "=== 錯(cuò)誤方法 ===\n";
    std::cout << "&obj: " << &obj << " (錯(cuò)誤地址!)\n";
    std::cout << "&const_obj: " << &const_obj << " (錯(cuò)誤地址!)\n\n";
    
    std::cout << "=== 正確方法 ===\n";
    // 使用 std::addressof (C++11)
    std::cout << "std::addressof(obj): " << std::addressof(obj) << " (真實(shí)地址)\n";
    std::cout << "std::addressof(const_obj): " << std::addressof(const_obj) << " (真實(shí)地址)\n\n";
    
    // 使用類型轉(zhuǎn)換技巧 (C++98 兼容)
    std::cout << "get_real_address(obj): " << get_real_address(obj) << " (真實(shí)地址)\n";
    std::cout << "get_real_address(const_obj): " << get_real_address(const_obj) << " (真實(shí)地址)\n";
    
    // 驗(yàn)證地址真實(shí)性
    std::cout << "\n=== 驗(yàn)證 ===\n";
    std::cout << "obj.data: " << obj.data << " (通過真實(shí)地址訪問: ";
    std::cout << std::addressof(obj)->data << ")\n";
    
    return 0;
}

# 編譯 (需要支持 C++11)
g++ -std=c++11 -o example example.cpp

# 運(yùn)行
./example

=== 錯(cuò)誤方法 ===
重載的 operator& 被調(diào)用
&obj: 0xdeadbeef (錯(cuò)誤地址!)
const 重載的 operator& 被調(diào)用
&const_obj: 0xdeadbeef (錯(cuò)誤地址!)

=== 正確方法 ===
std::addressof(obj): 0x7ffd108a1b5c (真實(shí)地址)
std::addressof(const_obj): 0x7ffd108a1b60 (真實(shí)地址)

get_real_address(obj): 0x7ffd108a1b5c (真實(shí)地址)
get_real_address(const_obj): 0x7ffd108a1b60 (真實(shí)地址)

=== 驗(yàn)證 ===
obj.data: 42 (通過真實(shí)地址訪問: 42)