| #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 |