From 77e4c496573dd9f6d64d08da8aa88c0f76bcdc88 Mon Sep 17 00:00:00 2001
From: Edward Diener <eldlistmailingz@tropicsoft.com>
Date: Thu, 18 Oct 2018 14:42:04 -0400
Subject: [PATCH 1/2] Fix for Python 3 versus Python 2 where the PyVarObject is
 different.

---
 include/boost/parameter/python.hpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/include/boost/parameter/python.hpp b/include/boost/parameter/python.hpp
index a52fc6e..cf05a91 100755
--- a/include/boost/parameter/python.hpp
+++ b/include/boost/parameter/python.hpp
@@ -41,8 +41,7 @@ namespace boost { namespace parameter { namespace python { namespace aux
   inline PyObject* unspecified_type()
   {
       static PyTypeObject unspecified = {
-          PyObject_HEAD_INIT(NULL)
-          0,                                /* ob_size        */
+          PyVarObject_HEAD_INIT(NULL,0)
           "Boost.Parameter.Unspecified",    /* tp_name        */
           PyType_Type.tp_basicsize,         /* tp_basicsize   */
           0,                                /* tp_itemsize    */
@@ -64,12 +63,24 @@ namespace boost { namespace parameter { namespace python { namespace aux
           Py_TPFLAGS_DEFAULT,               /* tp_flags       */
           0,                                /* tp_doc         */
       };
+      
+#if PY_MAJOR_VERSION <= 2
 
       if (unspecified.ob_type == 0)
       {
           unspecified.ob_type = &PyType_Type;
           PyType_Ready(&unspecified);
       }
+      
+#else
+
+      if (unspecified.ob_base.ob_base.ob_type == 0)
+      {
+          unspecified.ob_base.ob_base.ob_type = &PyType_Type;
+          PyType_Ready(&unspecified);
+      }
+      
+#endif
 
       return (PyObject*)&unspecified;
   }

From d76576a6a4be79ed5882fa30fc8dd6c7c0289c4f Mon Sep 17 00:00:00 2001
From: Edward Diener <eldlistmailingz@tropicsoft.com>
Date: Fri, 19 Oct 2018 15:59:46 -0400
Subject: [PATCH 2/2] Changed to use Py_TYPE instead of separate code depending
 on Python version.

---
 include/boost/parameter/python.hpp | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/include/boost/parameter/python.hpp b/include/boost/parameter/python.hpp
index cf05a91..0cab762 100755
--- a/include/boost/parameter/python.hpp
+++ b/include/boost/parameter/python.hpp
@@ -64,24 +64,12 @@ namespace boost { namespace parameter { namespace python { namespace aux
           0,                                /* tp_doc         */
       };
       
-#if PY_MAJOR_VERSION <= 2
-
-      if (unspecified.ob_type == 0)
+      if (Py_TYPE(&unspecified) == 0)
       {
-          unspecified.ob_type = &PyType_Type;
+          Py_TYPE(&unspecified) = &PyType_Type;
           PyType_Ready(&unspecified);
       }
       
-#else
-
-      if (unspecified.ob_base.ob_base.ob_type == 0)
-      {
-          unspecified.ob_base.ob_base.ob_type = &PyType_Type;
-          PyType_Ready(&unspecified);
-      }
-      
-#endif
-
       return (PyObject*)&unspecified;
   }