From 789cb2b24f82eda9f504bdcac5aa1f98c0f972f0 Mon Sep 17 00:00:00 2001
From: Fernando Cacciola <fernando.cacciola@gmail.com>
Date: Tue, 27 Mar 2007 16:02:57 +0000
Subject: [PATCH] boost::none implementation fixed for bcc <= 5.6.4

[SVN r37301]
---
 include/boost/none.hpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/boost/none.hpp b/include/boost/none.hpp
index 1f38291..fc6da93 100644
--- a/include/boost/none.hpp
+++ b/include/boost/none.hpp
@@ -12,12 +12,25 @@
 #ifndef BOOST_NONE_17SEP2003_HPP
 #define BOOST_NONE_17SEP2003_HPP
 
+#include <boost/detail/workaround.hpp>
+
 namespace boost {
 
+#if BOOST_WORKAROUND(_BORLANDC_, <= 0x564)
+
+namespace detail { struct none_helper{}; }
+
+typedef int detail::none_helper::*none_t ;
+
+none_t const none = ((none_t)0) ;
+
+#else
+
 enum none_t {none = 0};
 
-} // namespace boost
+#endif
 
+} // namespace boost
 
 #endif