Chris@16: #ifndef PTR_DWA20020601_HPP
Chris@16: # define PTR_DWA20020601_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // Based on boost/ref.hpp, thus:
Chris@16: //  Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
Chris@16: //  Copyright (C) 2001 Peter Dimov
Chris@16: 
Chris@16: # if _MSC_VER+0 >= 1020
Chris@16: #  pragma once
Chris@16: # endif
Chris@16: 
Chris@16: # include <boost/config.hpp>
Chris@16: # include <boost/mpl/bool.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python {
Chris@16: 
Chris@16: template<class Ptr> class pointer_wrapper
Chris@16: { 
Chris@16:  public:
Chris@16:     typedef Ptr type;
Chris@16:     
Chris@16:     explicit pointer_wrapper(Ptr x): p_(x) {}
Chris@16:     operator Ptr() const { return p_; }
Chris@16:     Ptr get() const { return p_; }
Chris@16:  private:
Chris@16:     Ptr p_;
Chris@16: };
Chris@16: 
Chris@16: template<class T>
Chris@16: inline pointer_wrapper<T> ptr(T t)
Chris@16: { 
Chris@16:     return pointer_wrapper<T>(t);
Chris@16: }
Chris@16: 
Chris@16: # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16: template<typename T>
Chris@16: class is_pointer_wrapper
Chris@16:     : public mpl::false_
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: template<typename T>
Chris@16: class is_pointer_wrapper<pointer_wrapper<T> >
Chris@16:     : public mpl::true_
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: template<typename T>
Chris@16: class unwrap_pointer
Chris@16: {
Chris@16:  public:
Chris@16:     typedef T type;
Chris@16: };
Chris@16: 
Chris@16: template<typename T>
Chris@16: class unwrap_pointer<pointer_wrapper<T> >
Chris@16: {
Chris@16:  public:
Chris@16:     typedef T type;
Chris@16: };
Chris@16: # else // no partial specialization
Chris@16: 
Chris@16: }} // namespace boost::python
Chris@16: 
Chris@16: #include <boost/type.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python {
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   typedef char (&yes_pointer_wrapper_t)[1];
Chris@16:   typedef char (&no_pointer_wrapper_t)[2];
Chris@16:       
Chris@16:   no_pointer_wrapper_t is_pointer_wrapper_test(...);
Chris@16: 
Chris@16:   template<typename T>
Chris@16:   yes_pointer_wrapper_t is_pointer_wrapper_test(boost::type< pointer_wrapper<T> >);
Chris@16: 
Chris@16:   template<bool wrapped>
Chris@16:   struct pointer_unwrapper
Chris@16:   {
Chris@16:       template <class T>
Chris@16:       struct apply
Chris@16:       {
Chris@16:           typedef T type;
Chris@16:       };
Chris@16:   };
Chris@16: 
Chris@16:   template<>
Chris@16:   struct pointer_unwrapper<true>
Chris@16:   {
Chris@16:       template <class T>
Chris@16:       struct apply
Chris@16:       {
Chris@16:           typedef typename T::type type;
Chris@16:       };
Chris@16:   };
Chris@16: }
Chris@16: 
Chris@16: template<typename T>
Chris@16: class is_pointer_wrapper
Chris@16: {
Chris@16:  public:
Chris@16:     BOOST_STATIC_CONSTANT(
Chris@16:         bool, value = (
Chris@16:         sizeof(detail::is_pointer_wrapper_test(boost::type<T>()))
Chris@16:             == sizeof(detail::yes_pointer_wrapper_t)));
Chris@16:     typedef mpl::bool_<value> type;
Chris@16: };
Chris@16: 
Chris@16: template <typename T>
Chris@16: class unwrap_pointer
Chris@16:     : public detail::pointer_unwrapper<
Chris@16:         is_pointer_wrapper<T>::value
Chris@16:       >::template apply<T>
Chris@16: {};
Chris@16: 
Chris@16: # endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16: 
Chris@16: }} // namespace boost::python
Chris@16: 
Chris@16: #endif // #ifndef PTR_DWA20020601_HPP