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#ifndef BORROWED_PTR_DWA20020601_HPP
# define BORROWED_PTR_DWA20020601_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)
# include <boost/config.hpp>
# include <boost/type.hpp>
# include <boost/mpl/if.hpp>
# include <boost/type_traits/object_traits.hpp>
# include <boost/type_traits/cv_traits.hpp>
# include <boost/python/tag.hpp>
namespace boost { namespace python { namespace detail {
template<class T> class borrowed
{
typedef T type;
};
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template<typename T>
struct is_borrowed_ptr
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
# if !defined(__MWERKS__) || __MWERKS__ > 0x3000
template<typename T>
struct is_borrowed_ptr<borrowed<T>*>
{
BOOST_STATIC_CONSTANT(bool, value = true);
};
template<typename T>
struct is_borrowed_ptr<borrowed<T> const*>
{
BOOST_STATIC_CONSTANT(bool, value = true);
};
template<typename T>
struct is_borrowed_ptr<borrowed<T> volatile*>
{
BOOST_STATIC_CONSTANT(bool, value = true);
};
template<typename T>
struct is_borrowed_ptr<borrowed<T> const volatile*>
{
BOOST_STATIC_CONSTANT(bool, value = true);
};
# else
template<typename T>
struct is_borrowed
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
template<typename T>
struct is_borrowed<borrowed<T> >
{
BOOST_STATIC_CONSTANT(bool, value = true);
};
template<typename T>
struct is_borrowed_ptr<T*>
: is_borrowed<typename remove_cv<T>::type>
{
};
# endif
# else // no partial specialization
typedef char (&yes_borrowed_ptr_t)[1];
typedef char (&no_borrowed_ptr_t)[2];
no_borrowed_ptr_t is_borrowed_ptr_test(...);
template <class T>
typename mpl::if_c<
is_pointer<T>::value
, T
, int
>::type
is_borrowed_ptr_test1(boost::type<T>);
template<typename T>
yes_borrowed_ptr_t is_borrowed_ptr_test(borrowed<T> const volatile*);
template<typename T>
class is_borrowed_ptr
{
public:
BOOST_STATIC_CONSTANT(
bool, value = (
sizeof(detail::is_borrowed_ptr_test(is_borrowed_ptr_test1(boost::type<T>())))
== sizeof(detail::yes_borrowed_ptr_t)));
};
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
}
template <class T>
inline T* get_managed_object(detail::borrowed<T> const volatile* p, tag_t)
{
return (T*)p;
}
}} // namespace boost::python::detail
#endif // #ifndef BORROWED_PTR_DWA20020601_HPP
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