http://blog.wonderrabbitproject.net/2014/02/c-pointer-stdenablefromthis.html

enable_shared_from_this_wrap.cxx

#include <memory>
 
template<class T_derived, class T_base = void>
class enable_shared_from_this_wrap: public T_base
{
public:
  std::shared_ptr<T_derived> shared_from_this()
  { return std::static_pointer_cast<T_derived>(T_base::shared_from_this_wrap()); }
  
  std::shared_ptr<T_derived const> shared_from_this() const
  { return std::static_pointer_cast<T_derived const>(T_base::shared_from_this_wrap()); }
};
 
template<class T_derived>
class enable_shared_from_this_wrap<T_derived, void>
  : public std::enable_shared_from_this<T_derived>
{
  using base_type = std::enable_shared_from_this<T_derived>;
protected:
  std::shared_ptr<T_derived> shared_from_this_wrap()
  { return base_type::shared_from_this(); }
  
  std::shared_ptr<T_derived const> shared_from_this_wrap() const
  { return base_type::shared_from_this(); }
};

class A: public enable_shared_from_this_wrap<A>
{
public:
  void fa(){}
};
 
class B: public enable_shared_from_this_wrap<B, A>{
public:
    void fb(){}
};
 
int main()
{
    auto b = std::make_shared<B>();
    b->shared_from_this()->fa();
    b->shared_from_this()->fb();
    // A a1;
    // a1.shared_from_this()->fa(); // throw bad_weak_ptr!
    // A* a2(new A);
    // a2->shared_from_this()->fa();  // throw bad_weak_ptr!
}

http://melpon.org/wandbox/permlink/eaJ1lhgxGwW121HU