New-style polymorphism

[SVN r24083]

src/wrapper.cpp

@@ -0,0 +1,65 @@
+// Copyright David Abrahams 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/wrapper.hpp>
+
+namespace boost { namespace python {
+
+namespace detail
+{
+  override wrapper_base::get_override(
+      char const* name
+    , PyTypeObject* class_object
+  ) const
+  {
+      if (this->m_self)
+      {
+          if (handle<> m = handle<>(
+                  python::allow_null(
+                      ::PyObject_GetAttrString(
+                          this->m_self, const_cast<char*>(name))))
+          )
+          {
+              PyObject* borrowed_f = 0;
+            
+              if (
+                  PyMethod_Check(m.get())
+                  && ((PyMethodObject*)m.get())->im_self == this->m_self
+                  && class_object->tp_dict != 0
+              )
+              {
+                  borrowed_f = ::PyDict_GetItemString(class_object->tp_dict, name);
+
+
+              }
+              if (borrowed_f != ((PyMethodObject*)m.get())->im_func)
+                  return override(m);
+          }
+      }
+      return override(handle<>(detail::none()));
+  }
+}
+
+#if 0
+namespace converter
+{
+  PyObject* BOOST_PYTHON_DECL do_polymorphic_ref_to_python(
+      python::detail::wrapper_base const volatile* x, type_info src
+  )
+  {
+      if (x == 0)
+      {
+          ::PyErr_Format(
+              PyExc_TypeError
+            , "Attempting to returning pointer or reference to instance of %s\n"
+              "for which no corresponding Python object exists. Wrap this function"
+              "with a return return value policy"
+          )
+      }
+  }
+  
+}
+#endif 
+
+}} // namespace boost::python::detail