1 | // Copyright David Abrahams 2002.
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2 | // Distributed under the Boost Software License, Version 1.0. (See
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3 | // accompanying file LICENSE_1_0.txt or copy at
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4 | // http://www.boost.org/LICENSE_1_0.txt)
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5 | #ifndef OBJ_MGR_ARG_FROM_PYTHON_DWA2002628_HPP
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6 | # define OBJ_MGR_ARG_FROM_PYTHON_DWA2002628_HPP
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7 |
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8 | # include <boost/python/detail/prefix.hpp>
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9 | # include <boost/python/detail/referent_storage.hpp>
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10 | # include <boost/python/detail/destroy.hpp>
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11 | # include <boost/python/detail/construct.hpp>
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12 | # include <boost/python/converter/object_manager.hpp>
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13 | # include <boost/python/detail/raw_pyobject.hpp>
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14 | # include <boost/python/tag.hpp>
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15 |
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16 | //
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17 | // arg_from_python converters for Python type wrappers, to be used as
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18 | // base classes for specializations.
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19 | //
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20 | namespace boost { namespace python { namespace converter {
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21 |
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22 | template <class T>
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23 | struct object_manager_value_arg_from_python
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24 | {
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25 | typedef T result_type;
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26 |
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27 | object_manager_value_arg_from_python(PyObject*);
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28 | bool convertible() const;
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29 | T operator()() const;
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30 | private:
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31 | PyObject* m_source;
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32 | };
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33 |
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34 | // Used for converting reference-to-object-manager arguments from
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35 | // python. The process used here is a little bit odd. Upon
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36 | // construction, we build the object manager object in the m_result
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37 | // object, *forcing* it to accept the source Python object by casting
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38 | // its pointer to detail::borrowed_reference. This is supposed to
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39 | // bypass any type checking of the source object. The convertible
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40 | // check then extracts the owned object and checks it. If the check
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41 | // fails, nothing else in the program ever gets to touch this strange
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42 | // "forced" object.
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43 | template <class Ref>
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44 | struct object_manager_ref_arg_from_python
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45 | {
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46 | typedef Ref result_type;
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47 |
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48 | object_manager_ref_arg_from_python(PyObject*);
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49 | bool convertible() const;
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50 | Ref operator()() const;
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51 | ~object_manager_ref_arg_from_python();
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52 | private:
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53 | typename python::detail::referent_storage<Ref>::type m_result;
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54 | };
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55 |
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56 | //
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57 | // implementations
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58 | //
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59 |
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60 | template <class T>
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61 | inline object_manager_value_arg_from_python<T>::object_manager_value_arg_from_python(PyObject* x)
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62 | : m_source(x)
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63 | {
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64 | }
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65 |
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66 | template <class T>
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67 | inline bool object_manager_value_arg_from_python<T>::convertible() const
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68 | {
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69 | return object_manager_traits<T>::check(m_source);
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70 | }
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71 |
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72 | template <class T>
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73 | inline T object_manager_value_arg_from_python<T>::operator()() const
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74 | {
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75 | return T(python::detail::borrowed_reference(m_source));
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76 | }
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77 |
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78 | template <class Ref>
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79 | inline object_manager_ref_arg_from_python<Ref>::object_manager_ref_arg_from_python(PyObject* x)
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80 | {
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81 | # if defined(__EDG_VERSION__) && __EDG_VERSION__ <= 243
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82 | // needed for warning suppression
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83 | python::detail::borrowed_reference x_ = python::detail::borrowed_reference(x);
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84 | python::detail::construct_referent<Ref>(&m_result.bytes, x_);
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85 | # else
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86 | python::detail::construct_referent<Ref>(&m_result.bytes, (python::detail::borrowed_reference)x);
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87 | # endif
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88 | }
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89 |
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90 | template <class Ref>
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91 | inline object_manager_ref_arg_from_python<Ref>::~object_manager_ref_arg_from_python()
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92 | {
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93 | python::detail::destroy_referent<Ref>(this->m_result.bytes);
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94 | }
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95 |
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96 | namespace detail
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97 | {
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98 | template <class T>
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99 | inline bool object_manager_ref_check(T const& x)
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100 | {
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101 | return object_manager_traits<T>::check(get_managed_object(x, tag));
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102 | }
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103 | }
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104 |
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105 | template <class Ref>
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106 | inline bool object_manager_ref_arg_from_python<Ref>::convertible() const
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107 | {
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108 | return detail::object_manager_ref_check(
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109 | python::detail::void_ptr_to_reference(this->m_result.bytes, (Ref(*)())0));
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110 | }
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111 |
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112 | template <class Ref>
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113 | inline Ref object_manager_ref_arg_from_python<Ref>::operator()() const
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114 | {
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115 | return python::detail::void_ptr_to_reference(
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116 | this->m_result.bytes, (Ref(*)())0);
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117 | }
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118 |
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119 | }}} // namespace boost::python::converter
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120 |
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121 | #endif // OBJ_MGR_ARG_FROM_PYTHON_DWA2002628_HPP
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