| // Copyright David Abrahams 2002. |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| #include <boost/python/module.hpp> |
| #include <boost/python/class.hpp> |
| #include <boost/python/return_value_policy.hpp> |
| #include <boost/python/manage_new_object.hpp> |
| #include <boost/python/reference_existing_object.hpp> |
| #include <boost/python/call_method.hpp> |
| #include <boost/python/pure_virtual.hpp> |
| #include <boost/python/def.hpp> |
| #include <boost/utility.hpp> |
| |
| using namespace boost::python; |
| |
| struct Callback |
| { |
| Callback(PyObject* o) : mSelf(o) {} |
| PyObject* mSelf; |
| }; |
| |
| struct P |
| { |
| virtual ~P(){} |
| virtual std::string f() = 0; |
| std::string g() { return "P::g()"; } |
| }; |
| |
| struct PCallback : P, Callback |
| { |
| PCallback (PyObject* self) : Callback(self) {} |
| |
| std::string f() |
| { |
| return call_method<std::string>(mSelf, "f"); |
| } |
| }; |
| |
| struct Q : virtual P |
| { |
| std::string f() { return "Q::f()"; } |
| }; |
| |
| struct A |
| { |
| virtual ~A(){} |
| virtual std::string f() { return "A::f()"; } |
| }; |
| |
| struct ACallback : A, Callback |
| { |
| ACallback (PyObject* self) : Callback(self) {} |
| |
| |
| std::string f() |
| { |
| return call_method<std::string>(mSelf, "f"); |
| } |
| |
| std::string default_f() |
| { |
| return A::f(); |
| } |
| }; |
| |
| struct B : A |
| { |
| virtual std::string f() { return "B::f()"; } |
| }; |
| |
| struct C : A |
| { |
| virtual std::string f() { return "C::f()"; } |
| }; |
| |
| struct D : A |
| { |
| virtual std::string f() { return "D::f()"; } |
| std::string g() { return "D::g()"; } |
| }; |
| |
| struct DCallback : D, Callback |
| { |
| DCallback (PyObject* self) : Callback(self) {} |
| |
| std::string f() |
| { |
| return call_method<std::string>(mSelf, "f"); |
| } |
| |
| std::string default_f() |
| { |
| return A::f(); |
| } |
| }; |
| |
| |
| A& getBCppObj () |
| { |
| static B b; |
| return b; |
| } |
| |
| std::string call_f(A& a) { return a.f(); } |
| |
| A* factory(unsigned choice) |
| { |
| switch (choice % 3) |
| { |
| case 0: return new A; |
| break; |
| case 1: return new B; |
| break; |
| default: return new C; |
| break; |
| } |
| } |
| |
| C& getCCppObj () |
| { |
| static C c; |
| return c; |
| } |
| |
| A* pass_a(A* x) { return x; } |
| |
| BOOST_PYTHON_MODULE_INIT(polymorphism_ext) |
| { |
| class_<A,boost::noncopyable,ACallback>("A") |
| .def("f", &A::f, &ACallback::default_f) |
| ; |
| |
| def("getBCppObj", getBCppObj, return_value_policy<reference_existing_object>()); |
| |
| class_<C,bases<A>,boost::noncopyable>("C") |
| .def("f", &C::f) |
| ; |
| |
| class_<D,bases<A>,DCallback,boost::noncopyable>("D") |
| .def("f", &D::f, &DCallback::default_f) |
| .def("g", &D::g) |
| ; |
| |
| def("pass_a", &pass_a, return_internal_reference<>()); |
| |
| def("getCCppObj", getCCppObj, return_value_policy<reference_existing_object>()); |
| |
| def("factory", factory, return_value_policy<manage_new_object>()); |
| |
| def("call_f", call_f); |
| |
| class_<P,boost::noncopyable,PCallback>("P") |
| .def("f", pure_virtual(&P::f)) |
| ; |
| |
| class_<Q, bases<P> >("Q") |
| .def("g", &P::g) // make sure virtual inheritance doesn't interfere |
| ; |
| } |
| |
| //#include "module_tail.cpp" |