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// 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"
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