Expose the "types" typedef of boost::optional_detail::operator_base as

public, rather than protected, since Spirit pokes at this typedef. 


[SVN r61832]

libs/optional

@@ -1 +1 @@
-Subproject commit a63dbe0f146fa09c50262964331b97cf9c2d34de
+Subproject commit 16f0a0aaafe5b66518e6d73a7fecf4c59ae6f2c4