From 1b13e37ec2eb61c4ba3271a4cd17cda82eba3f65 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <doug.gregor@gmail.com>
Date: Mon, 13 Sep 2004 00:16:35 +0000
Subject: [PATCH] Attempt at IBM xlC workaround

[SVN r25024]
---
 include/boost/graph/detail/adj_list_edge_iterator.hpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/boost/graph/detail/adj_list_edge_iterator.hpp b/include/boost/graph/detail/adj_list_edge_iterator.hpp
index e283a111..f6b1563a 100644
--- a/include/boost/graph/detail/adj_list_edge_iterator.hpp
+++ b/include/boost/graph/detail/adj_list_edge_iterator.hpp
@@ -29,8 +29,11 @@
 
 #include <iterator>
 #include <utility>
+#include <boost/detail/workaround.hpp>
 
-#define BOOST_GRAPH_NO_OPTIONAL
+#if BOOST_WORKAROUND( __IBMCPP__, <= 600 )
+#  define BOOST_GRAPH_NO_OPTIONAL
+#endif
 
 #ifdef BOOST_GRAPH_NO_OPTIONAL
 #  define BOOST_GRAPH_MEMBER .