[857] | 1 | #ifndef BORROWED_PTR_DWA20020601_HPP
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| 2 | # define BORROWED_PTR_DWA20020601_HPP
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| 3 | // Copyright David Abrahams 2002.
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See
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| 5 | // accompanying file LICENSE_1_0.txt or copy at
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| 6 | // http://www.boost.org/LICENSE_1_0.txt)
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| 7 |
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| 8 | # include <boost/config.hpp>
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| 9 | # include <boost/type.hpp>
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| 10 | # include <boost/mpl/if.hpp>
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| 11 | # include <boost/type_traits/object_traits.hpp>
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| 12 | # include <boost/type_traits/cv_traits.hpp>
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| 13 | # include <boost/python/tag.hpp>
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| 14 |
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| 15 | namespace boost { namespace python { namespace detail {
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| 16 |
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| 17 | template<class T> class borrowed
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| 18 | {
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| 19 | typedef T type;
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| 20 | };
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| 21 |
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| 22 | # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 23 | template<typename T>
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| 24 | struct is_borrowed_ptr
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| 25 | {
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| 26 | BOOST_STATIC_CONSTANT(bool, value = false);
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| 27 | };
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| 28 |
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| 29 | # if !defined(__MWERKS__) || __MWERKS__ > 0x3000
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| 30 | template<typename T>
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| 31 | struct is_borrowed_ptr<borrowed<T>*>
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| 32 | {
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| 33 | BOOST_STATIC_CONSTANT(bool, value = true);
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| 34 | };
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| 35 |
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| 36 | template<typename T>
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| 37 | struct is_borrowed_ptr<borrowed<T> const*>
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| 38 | {
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| 39 | BOOST_STATIC_CONSTANT(bool, value = true);
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| 40 | };
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| 41 |
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| 42 | template<typename T>
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| 43 | struct is_borrowed_ptr<borrowed<T> volatile*>
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| 44 | {
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| 45 | BOOST_STATIC_CONSTANT(bool, value = true);
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| 46 | };
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| 47 |
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| 48 | template<typename T>
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| 49 | struct is_borrowed_ptr<borrowed<T> const volatile*>
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| 50 | {
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| 51 | BOOST_STATIC_CONSTANT(bool, value = true);
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| 52 | };
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| 53 | # else
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| 54 | template<typename T>
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| 55 | struct is_borrowed
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| 56 | {
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| 57 | BOOST_STATIC_CONSTANT(bool, value = false);
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| 58 | };
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| 59 | template<typename T>
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| 60 | struct is_borrowed<borrowed<T> >
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| 61 | {
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| 62 | BOOST_STATIC_CONSTANT(bool, value = true);
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| 63 | };
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| 64 | template<typename T>
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| 65 | struct is_borrowed_ptr<T*>
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| 66 | : is_borrowed<typename remove_cv<T>::type>
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| 67 | {
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| 68 | };
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| 69 | # endif
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| 70 |
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| 71 | # else // no partial specialization
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| 72 |
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| 73 | typedef char (&yes_borrowed_ptr_t)[1];
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| 74 | typedef char (&no_borrowed_ptr_t)[2];
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| 75 |
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| 76 | no_borrowed_ptr_t is_borrowed_ptr_test(...);
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| 77 |
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| 78 | template <class T>
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| 79 | typename mpl::if_c<
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| 80 | is_pointer<T>::value
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| 81 | , T
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| 82 | , int
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| 83 | >::type
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| 84 | is_borrowed_ptr_test1(boost::type<T>);
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| 85 |
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| 86 | template<typename T>
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| 87 | yes_borrowed_ptr_t is_borrowed_ptr_test(borrowed<T> const volatile*);
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| 88 |
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| 89 | template<typename T>
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| 90 | class is_borrowed_ptr
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| 91 | {
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| 92 | public:
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| 93 | BOOST_STATIC_CONSTANT(
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| 94 | bool, value = (
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| 95 | sizeof(detail::is_borrowed_ptr_test(is_borrowed_ptr_test1(boost::type<T>())))
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| 96 | == sizeof(detail::yes_borrowed_ptr_t)));
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| 97 | };
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| 98 |
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| 99 | # endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 100 |
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| 101 | }
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| 102 |
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| 103 | template <class T>
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| 104 | inline T* get_managed_object(detail::borrowed<T> const volatile* p, tag_t)
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| 105 | {
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| 106 | return (T*)p;
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| 107 | }
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| 108 |
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| 109 | }} // namespace boost::python::detail
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| 110 |
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| 111 | #endif // #ifndef BORROWED_PTR_DWA20020601_HPP
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