From 1d018bbeab4d63802c656d54befca9597e0e7117 Mon Sep 17 00:00:00 2001
From: Jeremiah Willcock <jewillco@osl.iu.edu>
Date: Tue, 24 Nov 2009 21:35:30 +0000
Subject: [PATCH] Fixed graph property constness issues

[SVN r57910]
---
 include/boost/graph/reverse_graph.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/graph/reverse_graph.hpp b/include/boost/graph/reverse_graph.hpp
index bba67cfc..3a81c294 100644
--- a/include/boost/graph/reverse_graph.hpp
+++ b/include/boost/graph/reverse_graph.hpp
@@ -9,6 +9,8 @@
 #include <boost/graph/adjacency_iterator.hpp>
 #include <boost/graph/properties.hpp>
 #include <boost/tuple/tuple.hpp>
+#include <boost/type_traits.hpp>
+#include <boost/mpl/if.hpp>
 
 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
 // Stay out of the way of the concept checking class
@@ -324,7 +326,10 @@ set_property(const reverse_graph<BidirectionalGraph,GRef>& g, Tag tag,
 
 template<typename BidirectionalGraph, typename GRef, typename Tag>
 inline
-typename graph_property<BidirectionalGraph, Tag>::type
+typename boost::mpl::if_<
+           boost::is_const<typename boost::remove_reference<GRef>::type>,
+           const typename graph_property<BidirectionalGraph, Tag>::type&,
+           typename graph_property<BidirectionalGraph, Tag>::type& >::type
 get_property(const reverse_graph<BidirectionalGraph,GRef>& g, Tag tag)
 {
   return get_property(g.m_g, tag);