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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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