// 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) | |
#ifndef SHARED_PTR_FROM_PYTHON_DWA20021130_HPP | |
# define SHARED_PTR_FROM_PYTHON_DWA20021130_HPP | |
# include <boost/python/handle.hpp> | |
# include <boost/python/converter/shared_ptr_deleter.hpp> | |
# include <boost/python/converter/from_python.hpp> | |
# include <boost/python/converter/rvalue_from_python_data.hpp> | |
# include <boost/python/converter/registered.hpp> | |
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES | |
# include <boost/python/converter/pytype_function.hpp> | |
#endif | |
# include <boost/shared_ptr.hpp> | |
namespace boost { namespace python { namespace converter { | |
template <class T> | |
struct shared_ptr_from_python | |
{ | |
shared_ptr_from_python() | |
{ | |
converter::registry::insert(&convertible, &construct, type_id<shared_ptr<T> >() | |
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES | |
, &converter::expected_from_python_type_direct<T>::get_pytype | |
#endif | |
); | |
} | |
private: | |
static void* convertible(PyObject* p) | |
{ | |
if (p == Py_None) | |
return p; | |
return converter::get_lvalue_from_python(p, registered<T>::converters); | |
} | |
static void construct(PyObject* source, rvalue_from_python_stage1_data* data) | |
{ | |
void* const storage = ((converter::rvalue_from_python_storage<shared_ptr<T> >*)data)->storage.bytes; | |
// Deal with the "None" case. | |
if (data->convertible == source) | |
new (storage) shared_ptr<T>(); | |
else | |
{ | |
boost::shared_ptr<void> hold_convertible_ref_count( | |
(void*)0, shared_ptr_deleter(handle<>(borrowed(source))) ); | |
// use aliasing constructor | |
new (storage) shared_ptr<T>( | |
hold_convertible_ref_count, | |
static_cast<T*>(data->convertible)); | |
} | |
data->convertible = storage; | |
} | |
}; | |
}}} // namespace boost::python::converter | |
#endif // SHARED_PTR_FROM_PYTHON_DWA20021130_HPP |