Implement unions as members of structs.

mojo/public/cpp/bindings/lib/template_util.h

Index: mojo/public/cpp/bindings/lib/template_util.h
diff --git a/mojo/public/cpp/bindings/lib/template_util.h b/mojo/public/cpp/bindings/lib/template_util.h
index a90ee442747a043102ac4e809baa75cbe33aba5e..9a5788ce85d6537cf5cba289025cfdd7befad53a 100644
--- a/mojo/public/cpp/bindings/lib/template_util.h
+++ b/mojo/public/cpp/bindings/lib/template_util.h
@@ -100,7 +100,9 @@ struct IsBaseOf {
 };
 
 template <class T>
-struct RemovePointer {};
+struct RemovePointer {
+  typedef T type;

[viettrungluu, 2015/03/04 20:58:13]

This is probably right (since it matches[*] the C++11 remove_pointer), but have
you double-checked that it doesn't have any inadvertent effects?

[*] Well, we still don't handle const pointers correctly (nor volatile).

[azani, 2015/03/05 23:59:25]

Yes. Grepping revealed only one use of RemovePointer and this is fine.

+};
 template <class T>
 struct RemovePointer<T*> {
   typedef T type;