Previous implementation actually failed to give correct results on

many good compilers.  Still wondering about the use of
type_wrapper<T>* here. Wouldn't it be better to pass T*, and strip
const/volatile in has_##name##_helper ?


[SVN r16168]

libs/mpl

@@ -1 +1 @@
-Subproject commit 8d124d88bbf2756bcba2f66f00cf034fc46d76fe
+Subproject commit 86be3ece35759259f0ac095caf6576b2f44cd739