Fix cypclass (un)starred declaration code

Cython/Compiler/ExprNodes.py

@@ -10939,7 +10939,7 @@ class SizeofTypeNode(SizeofNode):
             error(self.pos, "Cannot take sizeof incomplete type '%s'" % arg_type)
 
     def calculate_result_code(self):
-        if self.arg_type.is_extension_type:
+        if self.arg_type.is_extension_type or self.arg_type.is_cyp_class:
             # the size of the pointer is boring
             # we want the size of the actual struct
             arg_code = self.arg_type.declaration_code("", deref=1)

Cython/Compiler/PyrexTypes.py

@@ -3893,10 +3893,15 @@ class CppClassType(CType):
 class CypClassType(CppClassType):
     is_cyp_class = 1
 
+    def empty_declaration_code(self):
+        if self._empty_declaration is None:
+            self._empty_declaration = self.declaration_code('', deref=1)
+        return self._empty_declaration
+
     def declaration_code(self, entity_code,
             for_display = 0, dll_linkage = None, pyrex = 0,
-            template_params = None):
-        if entity_code:
+            template_params = None, deref = 0):
+        if not deref:
             entity_code = "*%s" % entity_code
         return super(CypClassType, self).declaration_code(entity_code,
                 for_display=for_display, dll_linkage=dll_linkage,