{

public:

typedef Ptr type;

explicit pointer_wrapper(Ptr x): p_(x) {}

operator Ptr() const { return p_; }

Ptr get() const { return p_; }

private:

Ptr p_;

{

public:

typedef T type;

{

template <class T>

struct apply

{

typedef T type;

};

{

public:

BOOST_STATIC_CONSTANT(

bool, value = (

sizeof(detail::is_pointer_wrapper_test(boost::type<T>()))

== sizeof(detail::yes_pointer_wrapper_t)));

typedef mpl::bool_<value> type;

: public detail::pointer_unwrapper<

is_pointer_wrapper<T>::value

>::template apply<T>