112 lines
2.4 KiB
C++
112 lines
2.4 KiB
C++
#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
|