add note for namespace issues

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@8981 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/typemaps/factory.swg

@@ -54,6 +54,19 @@
     r = circle.radius()
 
   where circle is a Circle proxy instance.
+
+  NOTES: remember to fully qualify all the type names and don't
+  use %factory inside a namespace declaration, ie, instead of
+  
+     namespace Foo {
+       %factory(Geometry *Geometry::create, Point, Circle);
+     }
+
+  use
+
+     %factory(Foo::Geometry *Foo::Geometry::create, Foo::Point,  Foo::Circle);   
+
+     
 */
 
 %define %_factory_dispatch(Type)