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 RETURN_FROM_PYTHON_DWA200265_HPP
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6 | # define RETURN_FROM_PYTHON_DWA200265_HPP
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7 |
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8 | # include <boost/python/converter/from_python.hpp>
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9 | # include <boost/python/converter/rvalue_from_python_data.hpp>
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10 | # include <boost/python/converter/registered.hpp>
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11 | # include <boost/python/converter/registered_pointee.hpp>
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12 | # include <boost/python/converter/object_manager.hpp>
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13 | # include <boost/python/detail/void_ptr.hpp>
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14 | # include <boost/python/detail/void_return.hpp>
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15 | # include <boost/python/errors.hpp>
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16 | # include <boost/python/handle.hpp>
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17 | # include <boost/type_traits/has_trivial_copy.hpp>
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18 | # include <boost/mpl/and.hpp>
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19 | # include <boost/mpl/bool.hpp>
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20 |
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21 | namespace boost { namespace python { namespace converter {
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22 |
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23 | template <class T> struct is_object_manager;
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24 |
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25 | namespace detail
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26 | {
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27 | template <class T>
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28 | struct return_pointer_from_python
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29 | {
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30 | typedef T result_type;
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31 | T operator()(PyObject*) const;
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32 | };
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33 |
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34 | template <class T>
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35 | struct return_reference_from_python
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36 | {
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37 | typedef T result_type;
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38 | T operator()(PyObject*) const;
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39 | };
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40 |
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41 | template <class T>
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42 | struct return_rvalue_from_python
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43 | {
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44 | typedef T result_type;
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45 |
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46 | return_rvalue_from_python();
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47 | result_type operator()(PyObject*);
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48 | private:
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49 | rvalue_from_python_data<T> m_data;
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50 | };
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51 |
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52 | template <class T>
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53 | struct return_object_manager_from_python
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54 | {
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55 | typedef T result_type;
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56 | result_type operator()(PyObject*) const;
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57 | };
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58 |
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59 | template <class T>
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60 | struct select_return_from_python
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61 | {
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62 | BOOST_STATIC_CONSTANT(
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63 | bool, obj_mgr = is_object_manager<T>::value);
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64 |
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65 | BOOST_STATIC_CONSTANT(
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66 | bool, ptr = is_pointer<T>::value);
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67 |
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68 | BOOST_STATIC_CONSTANT(
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69 | bool, ref = is_reference<T>::value);
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70 |
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71 | typedef typename mpl::if_c<
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72 | obj_mgr
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73 | , return_object_manager_from_python<T>
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74 | , typename mpl::if_c<
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75 | ptr
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76 | , return_pointer_from_python<T>
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77 | , typename mpl::if_c<
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78 | ref
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79 | , return_reference_from_python<T>
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80 | , return_rvalue_from_python<T>
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81 | >::type
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82 | >::type
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83 | >::type type;
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84 | };
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85 | }
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86 |
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87 | template <class T>
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88 | struct return_from_python
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89 | : detail::select_return_from_python<T>::type
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90 | {
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91 | };
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92 |
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93 | // Specialization as a convenience for call and call_method
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94 | template <>
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95 | struct return_from_python<void>
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96 | {
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97 | typedef python::detail::returnable<void>::type result_type;
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98 |
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99 | result_type operator()(PyObject* x) const
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100 | {
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101 | (void_result_from_python)(x);
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102 | # ifdef BOOST_NO_VOID_RETURNS
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103 | return result_type();
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104 | # endif
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105 | }
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106 | };
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107 |
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108 | //
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109 | // Implementations
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110 | //
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111 | namespace detail
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112 | {
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113 | template <class T>
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114 | inline return_rvalue_from_python<T>::return_rvalue_from_python()
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115 | : m_data(
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116 | const_cast<registration*>(®istered<T>::converters)
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117 | )
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118 | {
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119 | }
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120 |
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121 | template <class T>
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122 | inline typename return_rvalue_from_python<T>::result_type
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123 | return_rvalue_from_python<T>::operator()(PyObject* obj)
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124 | {
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125 | // Take possession of the source object here. If the result is in
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126 | // fact going to be a copy of an lvalue embedded in the object,
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127 | // and we take possession inside rvalue_result_from_python, it
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128 | // will be destroyed too early.
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129 | handle<> holder(obj);
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130 |
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131 | return *(T*)
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132 | (rvalue_result_from_python)(obj, m_data.stage1);
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133 | }
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134 |
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135 | template <class T>
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136 | inline T return_reference_from_python<T>::operator()(PyObject* obj) const
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137 | {
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138 | return python::detail::void_ptr_to_reference(
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139 | (reference_result_from_python)(obj, registered<T>::converters)
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140 | , (T(*)())0);
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141 | }
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142 |
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143 | template <class T>
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144 | inline T return_pointer_from_python<T>::operator()(PyObject* obj) const
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145 | {
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146 | return T(
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147 | (pointer_result_from_python)(obj, registered_pointee<T>::converters)
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148 | );
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149 | }
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150 |
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151 | template <class T>
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152 | inline T return_object_manager_from_python<T>::operator()(PyObject* obj) const
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153 | {
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154 | return T(
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155 | object_manager_traits<T>::adopt(expect_non_null(obj))
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156 | );
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157 | }
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158 | }
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159 |
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160 | }}} // namespace boost::python::converter
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161 |
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162 | #endif // RETURN_FROM_PYTHON_DWA200265_HPP
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