C++ Class forward declaration drawbacks?

I want to use forward declaration of a class in my software, so I can have typedefs
and use them inside the class full declaration.

Smth like this:

class myclass;
typedef boost::shared_ptr pmyclass;
typedef std::list myclasslist;

class myclass : public baseclass
{
private:        // private member declarations

        __fastcall myclass();

public:         // public member declarations
        __fastcall myclass(myclass *Parent)
            : mEntry(new myclass2())
          {
            this->mParent = Parent;
          }
        const myclass *mParent;
        myclasslist mChildren;

        boost::scoped_ptr mEntry;
};

so my question is:
are there any drawbacks in this method? I recall some discussion on destructor issues with forward declaration but I did not get everything out of there.
or is there any other option to implement something like this?

Thanks.

EDIT:

I found the discussion I was referring to: here