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 MAKE_PTR_INSTANCE_DWA200296_HPP
Chris@16: # define MAKE_PTR_INSTANCE_DWA200296_HPP
Chris@16: 
Chris@16: # include <boost/python/object/make_instance.hpp>
Chris@16: # include <boost/python/converter/registry.hpp>
Chris@16: # include <boost/type_traits/is_polymorphic.hpp>
Chris@16: # include <boost/get_pointer.hpp>
Chris@16: # include <boost/detail/workaround.hpp>
Chris@16: # include <typeinfo>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace objects { 
Chris@16: 
Chris@16: template <class T, class Holder>
Chris@16: struct make_ptr_instance
Chris@16:     : make_instance_impl<T, Holder, make_ptr_instance<T,Holder> >
Chris@16: {
Chris@16:     template <class Arg>
Chris@16:     static inline Holder* construct(void* storage, PyObject*, Arg& x)
Chris@16:     {
Chris@16:         return new (storage) Holder(x);
Chris@16:     }
Chris@16:     
Chris@16:     template <class Ptr>
Chris@16:     static inline PyTypeObject* get_class_object(Ptr const& x)
Chris@16:     {
Chris@16:         return get_class_object_impl(get_pointer(x));
Chris@16:     }
Chris@16: #ifndef BOOST_PYTHON_NO_PY_SIGNATURES
Chris@16:     static inline PyTypeObject const* get_pytype()
Chris@16:     {
Chris@16:         return converter::registered<T>::converters.get_class_object();
Chris@16:     }
Chris@16: #endif
Chris@16:  private:
Chris@16:     template <class U>
Chris@16:     static inline PyTypeObject* get_class_object_impl(U const volatile* p)
Chris@16:     {
Chris@16:         if (p == 0)
Chris@16:             return 0; // means "return None".
Chris@16: 
Chris@16:         PyTypeObject* derived = get_derived_class_object(
Chris@16:             BOOST_DEDUCED_TYPENAME is_polymorphic<U>::type(), p);
Chris@16:         
Chris@16:         if (derived)
Chris@16:             return derived;
Chris@16:         return converter::registered<T>::converters.get_class_object();
Chris@16:     }
Chris@16:     
Chris@16:     template <class U>
Chris@16:     static inline PyTypeObject* get_derived_class_object(mpl::true_, U const volatile* x)
Chris@16:     {
Chris@16:         converter::registration const* r = converter::registry::query(
Chris@16:             type_info(typeid(*get_pointer(x)))
Chris@16:         );
Chris@16:         return r ? r->m_class_object : 0;
Chris@16:     }
Chris@16:     
Chris@16:     template <class U>
Chris@16:     static inline PyTypeObject* get_derived_class_object(mpl::false_, U*)
Chris@16:     {
Chris@16:         return 0;
Chris@16:     }
Chris@16: };
Chris@16:   
Chris@16: 
Chris@16: }}} // namespace boost::python::object
Chris@16: 
Chris@16: #endif // MAKE_PTR_INSTANCE_DWA200296_HPP