#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 |