From ed450cbf6821d913da9131529bc27786ef227a52 Mon Sep 17 00:00:00 2001
From: Hartmut Kaiser <hartmut.kaiser@gmail.com>
Date: Mon, 5 Jul 2010 03:11:56 +0000
Subject: [PATCH] Spirit: merging from trunk upto rev. 63622

[SVN r63642]
---
 include/boost/optional/optional.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/optional/optional.hpp b/include/boost/optional/optional.hpp
index 42277ba..47f4b1a 100644
--- a/include/boost/optional/optional.hpp
+++ b/include/boost/optional/optional.hpp
@@ -168,8 +168,10 @@ class optional_base : public optional_tag
 
     typedef BOOST_DEDUCED_TYPENAME is_reference<T>::type is_reference_predicate ;
 
+  public:
     typedef BOOST_DEDUCED_TYPENAME mpl::if_<is_reference_predicate,types_when_ref,types_when_not_ref>::type types ;
 
+  protected:
     typedef bool (this_type::*unspecified_bool_type)() const;
 
     typedef BOOST_DEDUCED_TYPENAME types::reference_type       reference_type ;