Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef SHARED_PTR_FROM_PYTHON_DWA20021130_HPP
Chris@16: # define SHARED_PTR_FROM_PYTHON_DWA20021130_HPP
Chris@16: 
Chris@16: # include <boost/python/handle.hpp>
Chris@16: # include <boost/python/converter/shared_ptr_deleter.hpp>
Chris@16: # include <boost/python/converter/from_python.hpp>
Chris@16: # include <boost/python/converter/rvalue_from_python_data.hpp>
Chris@16: # include <boost/python/converter/registered.hpp>
Chris@16: #ifndef BOOST_PYTHON_NO_PY_SIGNATURES
Chris@16: # include <boost/python/converter/pytype_function.hpp>
Chris@16: #endif
Chris@16: # include <boost/shared_ptr.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace converter { 
Chris@16: 
Chris@16: template <class T>
Chris@16: struct shared_ptr_from_python
Chris@16: {
Chris@16:     shared_ptr_from_python()
Chris@16:     {
Chris@16:         converter::registry::insert(&convertible, &construct, type_id<shared_ptr<T> >()
Chris@16: #ifndef BOOST_PYTHON_NO_PY_SIGNATURES
Chris@16:                       , &converter::expected_from_python_type_direct<T>::get_pytype
Chris@16: #endif
Chris@16:                       );
Chris@16:     }
Chris@16: 
Chris@16:  private:
Chris@16:     static void* convertible(PyObject* p)
Chris@16:     {
Chris@16:         if (p == Py_None)
Chris@16:             return p;
Chris@16:         
Chris@16:         return converter::get_lvalue_from_python(p, registered<T>::converters);
Chris@16:     }
Chris@16:     
Chris@16:     static void construct(PyObject* source, rvalue_from_python_stage1_data* data)
Chris@16:     {
Chris@16:         void* const storage = ((converter::rvalue_from_python_storage<shared_ptr<T> >*)data)->storage.bytes;
Chris@16:         // Deal with the "None" case.
Chris@16:         if (data->convertible == source)
Chris@16:             new (storage) shared_ptr<T>();
Chris@16:         else
Chris@16:         {
Chris@16:             boost::shared_ptr<void> hold_convertible_ref_count(
Chris@16:               (void*)0, shared_ptr_deleter(handle<>(borrowed(source))) );
Chris@16:             // use aliasing constructor
Chris@16:             new (storage) shared_ptr<T>(
Chris@16:                 hold_convertible_ref_count,
Chris@16:                 static_cast<T*>(data->convertible));
Chris@16:         }
Chris@16:         
Chris@16:         data->convertible = storage;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: }}} // namespace boost::python::converter
Chris@16: 
Chris@16: #endif // SHARED_PTR_FROM_PYTHON_DWA20021130_HPP