enable_shared_from_this_wrap.hxx

#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(); }
};

test.cxx

#include "enable_shared_from_this_wrap.hxx"

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();
}

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