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 | #include <boost/python/module.hpp> |
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6 | #include <boost/python/class.hpp> |
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7 | #include <boost/python/return_value_policy.hpp> |
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8 | #include <boost/python/manage_new_object.hpp> |
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9 | #include <boost/python/reference_existing_object.hpp> |
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10 | #include <boost/python/call_method.hpp> |
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11 | #include <boost/python/pure_virtual.hpp> |
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12 | #include <boost/python/def.hpp> |
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13 | #include <boost/utility.hpp> |
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14 | |
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15 | using namespace boost::python; |
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16 | |
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17 | struct Callback |
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18 | { |
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19 | Callback(PyObject* o) : mSelf(o) {} |
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20 | PyObject* mSelf; |
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21 | }; |
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22 | |
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23 | struct P |
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24 | { |
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25 | virtual ~P(){} |
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26 | virtual std::string f() = 0; |
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27 | std::string g() { return "P::g()"; } |
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28 | }; |
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29 | |
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30 | struct PCallback : P, Callback |
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31 | { |
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32 | PCallback (PyObject* self) : Callback(self) {} |
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33 | |
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34 | std::string f() |
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35 | { |
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36 | return call_method<std::string>(mSelf, "f"); |
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37 | } |
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38 | }; |
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39 | |
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40 | struct Q : virtual P |
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41 | { |
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42 | std::string f() { return "Q::f()"; } |
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43 | }; |
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44 | |
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45 | struct A |
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46 | { |
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47 | virtual ~A(){} |
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48 | virtual std::string f() { return "A::f()"; } |
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49 | }; |
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50 | |
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51 | struct ACallback : A, Callback |
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52 | { |
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53 | ACallback (PyObject* self) : Callback(self) {} |
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54 | |
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55 | |
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56 | std::string f() |
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57 | { |
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58 | return call_method<std::string>(mSelf, "f"); |
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59 | } |
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60 | |
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61 | std::string default_f() |
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62 | { |
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63 | return A::f(); |
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64 | } |
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65 | }; |
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66 | |
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67 | struct B : A |
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68 | { |
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69 | virtual std::string f() { return "B::f()"; } |
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70 | }; |
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71 | |
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72 | struct C : A |
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73 | { |
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74 | virtual std::string f() { return "C::f()"; } |
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75 | }; |
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76 | |
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77 | struct D : A |
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78 | { |
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79 | virtual std::string f() { return "D::f()"; } |
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80 | std::string g() { return "D::g()"; } |
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81 | }; |
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82 | |
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83 | struct DCallback : D, Callback |
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84 | { |
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85 | DCallback (PyObject* self) : Callback(self) {} |
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86 | |
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87 | std::string f() |
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88 | { |
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89 | return call_method<std::string>(mSelf, "f"); |
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90 | } |
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91 | |
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92 | std::string default_f() |
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93 | { |
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94 | return A::f(); |
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95 | } |
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96 | }; |
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97 | |
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98 | |
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99 | A& getBCppObj () |
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100 | { |
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101 | static B b; |
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102 | return b; |
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103 | } |
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104 | |
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105 | std::string call_f(A& a) { return a.f(); } |
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106 | |
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107 | A* factory(unsigned choice) |
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108 | { |
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109 | switch (choice % 3) |
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110 | { |
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111 | case 0: return new A; |
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112 | break; |
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113 | case 1: return new B; |
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114 | break; |
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115 | default: return new C; |
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116 | break; |
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117 | } |
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118 | } |
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119 | |
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120 | C& getCCppObj () |
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121 | { |
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122 | static C c; |
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123 | return c; |
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124 | } |
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125 | |
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126 | A* pass_a(A* x) { return x; } |
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127 | |
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128 | BOOST_PYTHON_MODULE_INIT(polymorphism_ext) |
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129 | { |
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130 | class_<A,boost::noncopyable,ACallback>("A") |
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131 | .def("f", &A::f, &ACallback::default_f) |
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132 | ; |
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133 | |
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134 | def("getBCppObj", getBCppObj, return_value_policy<reference_existing_object>()); |
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135 | |
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136 | class_<C,bases<A>,boost::noncopyable>("C") |
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137 | .def("f", &C::f) |
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138 | ; |
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139 | |
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140 | class_<D,bases<A>,DCallback,boost::noncopyable>("D") |
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141 | .def("f", &D::f, &DCallback::default_f) |
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142 | .def("g", &D::g) |
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143 | ; |
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144 | |
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145 | def("pass_a", &pass_a, return_internal_reference<>()); |
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146 | |
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147 | def("getCCppObj", getCCppObj, return_value_policy<reference_existing_object>()); |
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148 | |
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149 | def("factory", factory, return_value_policy<manage_new_object>()); |
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150 | |
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151 | def("call_f", call_f); |
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152 | |
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153 | class_<P,boost::noncopyable,PCallback>("P") |
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154 | .def("f", pure_virtual(&P::f)) |
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155 | ; |
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156 | |
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157 | class_<Q, bases<P> >("Q") |
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158 | .def("g", &P::g) // make sure virtual inheritance doesn't interfere |
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159 | ; |
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160 | } |
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161 | |
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162 | //#include "module_tail.cpp" |
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