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test.cpp,最小测试代码

#include <memory>
class Parent{ // A Interface That I can't modify! can't add 'friend' or modify 'protected'
protected:
    virtual ~Parent(){};
public:
    // other interfaces that no one is suitable for 'delete this'
};

class Derived : public Parent{ // My class
public:
    virtual ~Derived(){}
};

class Deleter : public Parent // My deleter to use unique_ptr
{
public:
    void operator()(Parent* ptr)
    {
        delete ptr; // Actually Wrong? cannot access ptr's protected & private member
    }
};

int main(int argc, …