gistfile1.txt

#include <iostream>
#include <memory>

struct Base : public std::enable_shared_from_this<Base>
{
    int a;
    virtual void f() const { std::cout << "I am base!\n"; }
    virtual ~Base() {}
};

struct Derived : public Base
{
    void f() const override
    {
        std::cout << "I am derived!\n";
    }

    void x() const
    {
        auto self = std::static_pointer_cast<Derived>(shared_from_this());
        auto lambda = [self]() { self->y(); };
        self->f();
    }

    void y()
    {
        std::cout << "new function" << std::endl;
    }

    ~Derived() {}
};

int main() {
    auto basePtr =  std::make_shared<Derived>();
    basePtr->x();
   // basePtr->f();

    //auto downcastedPtr = std::static_pointer_cast<Derived>(basePtr);

    //downcastedPtr->f();
   // downcastedPtr->x();

}