#ifndef PTR_DWA20020601_HPP

# define PTR_DWA20020601_HPP



# include <boost/python/detail/prefix.hpp>

// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

//

// Based on boost/ref.hpp, thus:

//  Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)

//  Copyright (C) 2001 Peter Dimov



# if _MSC_VER+0 >= 1020

#  pragma once

# endif



# include <boost/config.hpp>

# include <boost/mpl/bool.hpp>



namespace boost { namespace python {



template<class Ptr> class pointer_wrapper

{ 

 public:

    typedef Ptr type;

    

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

    operator Ptr() const { return p_; }

    Ptr get() const { return p_; }

 private:

    Ptr p_;

};



template<class T>

inline pointer_wrapper<T> ptr(T t)

{ 

    return pointer_wrapper<T>(t);

}



# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

template<typename T>

class is_pointer_wrapper

    : public mpl::false_

{

};



template<typename T>

class is_pointer_wrapper<pointer_wrapper<T> >

    : public mpl::true_

{

};



template<typename T>

class unwrap_pointer

{

 public:

    typedef T type;

};



template<typename T>

class unwrap_pointer<pointer_wrapper<T> >

{

 public:

    typedef T type;

};

# else // no partial specialization



}} // namespace boost::python



#include <boost/type.hpp>



namespace boost { namespace python {



namespace detail

{

  typedef char (&yes_pointer_wrapper_t)[1];

  typedef char (&no_pointer_wrapper_t)[2];

      

  no_pointer_wrapper_t is_pointer_wrapper_test(...);



  template<typename T>

  yes_pointer_wrapper_t is_pointer_wrapper_test(boost::type< pointer_wrapper<T> >);



  template<bool wrapped>

  struct pointer_unwrapper

  {

      template <class T>

      struct apply

      {

          typedef T type;

      };

  };



  template<>

  struct pointer_unwrapper<true>

  {

      template <class T>

      struct apply

      {

          typedef typename T::type type;

      };

  };

}



template<typename T>

class is_pointer_wrapper

{

 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;

};



template <typename T>

class unwrap_pointer

    : public detail::pointer_unwrapper<

        is_pointer_wrapper<T>::value

      >::template apply<T>

{};



# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION



}} // namespace boost::python



#endif // #ifndef PTR_DWA20020601_HPP

