C++：通过引用 unique_ptr object 来制作 unique_ptr null

Question

This might be a stupid question, but can I make unique_ptr null by reference to unique_ptr object?

#include<iostream>
#include<memory>

int main() 
{
    std::unique_ptr<int> a = std::make_unique<int>(2);
    int& b = *a.get();
    
    // use "b" to make "a" nullptr

    return 0;
}

Answer 1

No. There is no way to do that. An int is just an int and a reference to an int is just a reference to an int . It does not know about pointers that hold its address.