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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)
#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>
# 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> >());
}
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
new (storage) shared_ptr<T>(
static_cast<T*>(data->convertible),
shared_ptr_deleter(handle<>(borrowed(source)))
);
data->convertible = storage;
}
};
}}} // namespace boost::python::converter
#endif // SHARED_PTR_FROM_PYTHON_DWA20021130_HPP