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111 lines
2.4 KiB
111 lines
2.4 KiB
#ifndef BORROWED_PTR_DWA20020601_HPP |
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# define BORROWED_PTR_DWA20020601_HPP |
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// Copyright David Abrahams 2002. |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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# include <boost/config.hpp> |
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# include <boost/type.hpp> |
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# include <boost/mpl/if.hpp> |
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# include <boost/type_traits/object_traits.hpp> |
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# include <boost/type_traits/cv_traits.hpp> |
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# include <boost/python/tag.hpp> |
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namespace boost { namespace python { namespace detail { |
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template<class T> class borrowed |
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{ |
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typedef T type; |
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}; |
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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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template<typename T> |
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struct is_borrowed_ptr |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = false); |
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}; |
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# if !defined(__MWERKS__) || __MWERKS__ > 0x3000 |
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template<typename T> |
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struct is_borrowed_ptr<borrowed<T>*> |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = true); |
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}; |
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template<typename T> |
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struct is_borrowed_ptr<borrowed<T> const*> |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = true); |
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}; |
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template<typename T> |
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struct is_borrowed_ptr<borrowed<T> volatile*> |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = true); |
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}; |
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template<typename T> |
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struct is_borrowed_ptr<borrowed<T> const volatile*> |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = true); |
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}; |
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# else |
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template<typename T> |
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struct is_borrowed |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = false); |
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}; |
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template<typename T> |
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struct is_borrowed<borrowed<T> > |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = true); |
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}; |
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template<typename T> |
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struct is_borrowed_ptr<T*> |
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: is_borrowed<typename remove_cv<T>::type> |
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{ |
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}; |
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# endif |
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# else // no partial specialization |
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typedef char (&yes_borrowed_ptr_t)[1]; |
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typedef char (&no_borrowed_ptr_t)[2]; |
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no_borrowed_ptr_t is_borrowed_ptr_test(...); |
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template <class T> |
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typename mpl::if_c< |
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is_pointer<T>::value |
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, T |
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, int |
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>::type |
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is_borrowed_ptr_test1(boost::type<T>); |
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template<typename T> |
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yes_borrowed_ptr_t is_borrowed_ptr_test(borrowed<T> const volatile*); |
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template<typename T> |
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class is_borrowed_ptr |
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{ |
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public: |
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BOOST_STATIC_CONSTANT( |
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bool, value = ( |
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sizeof(detail::is_borrowed_ptr_test(is_borrowed_ptr_test1(boost::type<T>()))) |
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== sizeof(detail::yes_borrowed_ptr_t))); |
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}; |
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# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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} |
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template <class T> |
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inline T* get_managed_object(detail::borrowed<T> const volatile* p, tag_t) |
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{ |
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return (T*)p; |
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} |
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}} // namespace boost::python::detail |
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#endif // #ifndef BORROWED_PTR_DWA20020601_HPP
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