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// Copyright Joel de Guzman 2004. 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/def.hpp>
#include <boost/python/extract.hpp>
#include <boost/python/to_python_converter.hpp>
#include <boost/python/class.hpp>
using namespace boost::python;
struct A
{
};
struct B
{
A a;
B(const A& a_):a(a_){}
};
// Converter from A to python int
struct BToPython
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
: converter::to_python_target_type<A> //inherits get_pytype
#endif
{
static PyObject* convert(const B& b)
{
return boost::python::incref(boost::python::object(b.a).ptr());
}
};
// Conversion from python int to A
struct BFromPython
{
BFromPython()
{
boost::python::converter::registry::push_back(
&convertible,
&construct,
boost::python::type_id< B >()
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
, &converter::expected_from_python_type<A>::get_pytype//convertible to A can be converted to B
#endif
);
}
static void* convertible(PyObject* obj_ptr)
{
extract<const A&> ex(obj_ptr);
if (!ex.check()) return 0;
return obj_ptr;
}
static void construct(
PyObject* obj_ptr,
boost::python::converter::rvalue_from_python_stage1_data* data)
{
void* storage = (
(boost::python::converter::rvalue_from_python_storage< B >*)data)-> storage.bytes;
extract<const A&> ex(obj_ptr);
new (storage) B(ex());
data->convertible = storage;
}
};
B func(const B& b) { return b ; }
BOOST_PYTHON_MODULE(pytype_function_ext)
{
to_python_converter< B , BToPython,true >(); //has get_pytype
BFromPython();
class_<A>("A") ;
def("func", &func);
}
#include "module_tail.cpp"
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