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