Smart destructor

smart_dtor.cpp

/*
 * Original work: https://gist.github.com/odeblic/fa54037bf4d764a5dc02735cb4bd79f3
 * Inspired from: https://youtu.be/ZiNGWHg5Z-o
 *
 * Compile
 * 
 *    $ g++ -Wall -Wextra smart_dtor.cpp 
 *
 * Run
 *
 *    $ ./a.out 
 *    make_shared<Base>
 *    ~Base()
 *
 *    $ ./a.out Derived
 *    make_shared<Derived>
 *    ~Derived()
 *    ~Intermediate()
 *    ~Base()
 */

#include <iostream>
#include <memory>

struct Base
{
    ~Base()
    {
        std::cout << "~Base()" << std::endl;
    }
};

struct Intermediate : Base
{
    ~Intermediate()
    {
        std::cout << "~Intermediate()" << std::endl;
    }
};

struct Derived : Intermediate
{
    ~Derived()
    {
        std::cout << "~Derived()" << std::endl;
    }
};

std::shared_ptr<Base> Factory (bool isBase)
{
    if (isBase)
    {
        std::cout << "make_shared<Base>" << std::endl;
        return std::make_shared<Base>();
    }
    else
    {
        std::cout << "make_shared<Derived>" << std::endl;
        return std::make_shared<Derived>();
    }
}

int main (int argc, char**)
{
    std::shared_ptr<Base> p = Factory(argc % 2);
}