#include <iostream>
 
class Base
{
public:
    Base() { std::cout << "Base" << std::endl; }
    virtual ~Base() { std::cout << "~Base" << std::endl; }
};
 
class Derived : public Base
{
public:
    Derived() { std::cout << "Derived" << std::endl; }
    virtual ~Derived() { std::cout << "~Derived" << std::endl; }
};
 
 
template<class T> T *Safe_Or_Not (T *object)
{
    object->T::~T ();
    ::new (object) T;
    return object;
}
 
int main(int argc, char *argv[])
{
    Base* b = new Derived;
 
    b = Safe_Or_Not(b);
    delete b;
    return 0;
}

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